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Radiographic knee osteoarthritis severity has no impact on fall risk: the locomotive syndrome and health outcomes in the aizu cohort study (LOHAS): a cross-sectional study

Abstract

Background

To investigate factors that have an impact on the risk of falls and determine whether radiographic knee osteoarthritis (KOA) is a factor involved in falls independent of knee pain, psychological factors, and physical function.

Methods

A cross-sectional analysis was conducted on 1083 subjects for the 2009 Locomotive Syndrome and Health Outcomes in the Aizu Cohort Study (LOHAS). A logistic regression analysis was performed to examine the relationship between radiographic KOA and fall history.

Results

Fall history was significantly associated with the severity of knee pain. Compared to subjects with no knee pain, the odds ratio (OR) was 1.53 times higher in the subjects with mild knee pain (95% confidence interval [CI]: 1.04–2.25), 1.69 times higher in those with moderate knee pain (95%CI: 1.03–2.79), and 2.98 times higher in those with severe knee pain (95%CI: 1.67–5.30). In subjects with depression, the OR was 1.91 (95%CI: 1.25–2.92), and in those with decreased mobility, the OR was 1.70 (95%CI: 1.08–2.69). Age, gender, knee crepitus, BMI, OLST, and sleeping pill use were not significantly associated with fall risk. In a multivariate analysis, radiographic KOA severity was not significantly associated with fall risk (OR 0.81, 95%CI 0.44–1.50 in mild OA; OR 1.10, 95%CI 0.57–2.14 in severe OA).

Conclusion

Knee pain, decreased mobility, and depression, but not the radiographic KOA severity, were significantly associated with a fall risk. Regardless of the individual's radiographic KOA severity, the risk of falls may be reduced by treating his/her knee pain, mobility problems, and/or psychological factors.

Peer Review reports

Background

Falls are a leading cause of injury-related morbidity and mortality among older adults, with more than one in four older adults falling each year [1]. Costs of care after falls in the elderly are burdensome, reaching over $31 billion dollars in the United States in 2015 [2]. Falls may also lead to a fear of falling, decreased physical function, limited physical activity, loss of independence, and a higher mortality risk [3, 4].

Knee osteoarthritis (KOA) is a major public health problem associated with aging in musculoskeletal disorders [5]. The prevalence of radiographic KOA in adults aged ≥ 60 years in the U.S. was estimated to be 37% [6]. Common symptoms of KOA include knee pain, stiffness, swelling, decreased mobility, muscle weakness, and difficulty walking and climbing stairs [7]. Pain, dysfunction, and disability are caused by progressive loss of articular cartilage [8] and synovitis [9] of the knee joint, and the progression of KOA tends to lead to increased physical limitations, pain, and functionality restrictions [10].

An association between KOA and the risk of falls has been reported in cross-sectional studies [11,12,13,14], prospective cohorts [15,16,17,18], and longitudinal studies [19,20,21,22,23] (Table 1), but the results are inconsistent and controversial [17]. Although the diagnosis of KOA is often based on the combination of plain radiographs and subjective symptoms, several studies have described the involvement of psychological factors such as depression in the severity of symptoms and physical function in patients with KOA [24]. The need to consider psychological factors in assessing the association between KOA and falls has been addressed [13], but we found no published investigation of the impact of radiographic KOA severity on fall risk that also takes into account psychological factors. Even with the same radiographic KOA severity, pain and physical function vary from case to case. Prior studies have shown that the radiographic KOA severity itself is associated with falls [14, 15, 20]. By considering a variety of confounding factors, including psychological factors that have not been examined previously, this would be a new finding to determine whether the radiographic KOA severity itself is a risk for falls. Furthermore, if the radiographic KOA severity itself is not a risk for falls, this finding sends an important clinical message that falls can be prevented by improving factors other than the radiographic KOA severity, which are difficult to improve with current medicine. We conducted the present study to (i) investigate factors that have an impact on the risk of falls, and (ii) clarify the impact of the radiographic KOA severity on the risk of falls.

Table 1 Summary of reviewed studies

Methods

Participants

The Aizu Cohort Study on Locomotive Syndrome and Health Outcomes (LOHAS) was designed in 2008 to investigate the quality of life (QOL), motor function, medical costs, mortality, and cardiovascular disease attributable to motor dysfunction. Residents of the Japanese towns of Minamiaizu and Tadami in Fukushima Prefecture who participated in annual health checkups conducted by their local governments were enrolled in the LOHAS. All of the participants were enrolled in the National Health Insurance System of Japan. The detailed design of LOHAS has been described [25]. The present study was a cross-sectional analysis using data from the 2009 LOHAS baseline survey, which included 3,790 participants, among whom all 1,469 subjects who requested the examination underwent plane radiography of both knee joints while in a standing position and responded to fall history. The 26 subjects with a history of knee surgery, trauma, rheumatoid arthritis, or joint diseases other than KOA were excluded from the present study, as were the 386 subjects with missing data regarding BMI, sleeping pill use, knee pain, knee crepitus, Center of Epidemiologic Studies Depression Scale-10 (CESD-10) score, Timed Up and Go test (TUG), One-leg Standing Test (OLST), or fall history. A final total of 1,083 subjects were included in the present analyses (Fig. 1).

Fig. 1
figure 1

Flowchart of the subjects' enrollment. A total of 1,083 subjects were included in the analysis. LOHAS, the Locomotive Syndrome and Health Outcome in Aizu Cohort Study, BMI Body mass index, CESD-10 Center of Epidemiologic Studies Depression Scale-10, TUG Timed Up and Go Test, OLST One-Leg Standing test

Written informed consent for the use of data collected in LOHAS was obtained from all participants upon enrollment. The present study complied with the Declaration of Helsinki and was approved by the Research Ethics Committee of Fukushima Medical University (No. 295, 673).

The questionnaire used in LOHAS recorded the participant's occupation, employment status, surgical history, sleeping pill use, CESD-10 score, and fall history. Sleeping pill use is one of the most common causes of falls [26]. In this study, a history of sleeping pill use was defined as using sleeping pills at least once a week. The Center of Epidemiologic Studies Depression Scale (CES-D) is a self-reported psychometric scale intended to identify the frequency and severity of depressive symptoms [27]. The CESD-10 is a short form (10 items) of the CES-D that provides a simple assessment of depression; scores of ≥ 10 points indicate the presence of clinical depression [28]. We defined a fall as 'an event in which an individual unexpectedly comes to rest on the ground, floor, or lower level by tripping or stepping off.' The participants were asked 'Have you had any falls in the past 12 months?'. If the participant had a fall history, we defined him or her as “positive” for fall experiences.

Knee symptoms

During the annual physical checkup, the degree of knee pain in the last month was recorded using a six-point scale (0 points, a complete absence of pain, 1 point; very slight pain, 2 points; slight pain; 3 points, moderate pain; 4 points, difficult pain; 5 points, severe pain) based on the participant's questionnaire response. Subjects who had any fall in the past month recorded regular knee pain after falls. If there was a fall history, the degree of knee pain prior to the fall was recorded. In our present analyses, knee pain was classified into four categories; 0 points, no pain; 1 or 2 points, mild pain; 3 points, moderate pain; and 4 or 5 points, severe pain.

The presence or absence of crepitus was also recorded. Crepitus is one of the physical symptoms of KOA. If crepitus was present in either knee as a physical symptom by self-report, the subjects were defined to have crepitus. Individuals with KOA and knee crepitus have been reportedly associated with falls [22]; therefore, knee crepitus was included in this analysis.

Radiological assessment

The subjects' radiographic KOA severity was graded based on the Kellgren-Lawrence classification (KL grade) [29]. Two well-trained knee surgeons assessed the anterior–posterior view of both knee plane radiographs of subjects in the standing position. The intra-observer reliability was 0.653, and the inter-observer reliability was 0.652. Since the reported intra- and inter-observer reliability values of the KL-grade classification are 0.56 and 0.61, respectively, our grading accuracy equals or surpasses that of an earlier study [30]. When the knee surgeons' assessment of the KL grade for a subject did not match, consensus was reached via discussion. In the present study, we thus used the KL grade on the subject's more severe side and categorized the KL grades 0 as no OA, grades 1 and 2 as mild OA, and grades 3 and 4 as severe OA.

Physical function

In the present study, we evaluated the subjects' physical function based on their TUG and OLST results. TUG evaluates mobility capability, and OLST assesses static balance. The TUG score is the time taken to get up from a chair without armrests, walk 3 m, return to the chair and sit down. Several studies have considered a TUG time ≥ 10 s to be the cutoff value for fall risk [31, 32]. In the present study we likewise defined a TUG time < 10 s as normal mobility and ≥ 10 s as decreased mobility. The OLST score is the length of time that a subject is able to stand on one leg (either side) with open eyes. An OLST time < 10 s is considered a useful predictor of fall risk in the elderly [33, 34]. We used the OLST score measured on the subject's side with the more severe KL grade in the present analyses, and we thus defined OLST times ≥ 10 s as normal balance and < 10 s as balance disability.

Statistics analysis

Only the LOHAS subjects with complete data were enrolled in the primary analysis. Descriptive statistics were calculated for the subjects' baseline characteristics. Continuous data are summarized as means and standard deviations, and dichotomous or categorical data are presented as proportions. Means of continuous variables for the two groups were compared by t-test. To observe correlations between variables, Pearson's correlation coefficients were obtained. We performed univariate and multivariate logistic analyses to investigate the association between fall history and several factors, and we used a categorical variable, i.e., fall history, as the dependent variable. The categorical variables age, gender, BMI, sleeping pill use, knee pain, knee crepitus, CESD-10, TUG, OLST, and radiographic KOA severity were used as independent variables. In addition, we also performed a multivariate analysis excluding subjects with no OA, to consider for depression and decreased mobility not associated with KOA. Variance inflation factor (VIF) is a measure of multicollinearity in multivariate analysis. A high VIF indicates that the associated independent variable is highly collinear with other variables in the model. The odds ratios (OR) and 95% confidence intervals (CI) were calculated. All tests of statistical significance were two-tailed. Probability (p)-values < 0.05 were considered significant. All analyses were conducted using JMP PRO 16 (SAS, Cary, NC, USA).

Results

The subjects' characteristics

The characteristics of the 1,083 subjects are summarized in Table 2. Compared to the excluded subjects, the enrolled subjects tended to be older and more likely to use sleeping pills, have severe knee pain and crepitus, have decreased mobility, and be a positive for falls.

Table 2 Subject characteristics

The prevalence and grade classification of knee pain

The degree and classification of knee pain in the 1,083 subjects were as follows: no pain in 419 subjects (38.7%), mild pain (1 or 2 points) in 419 subjects (38.7%), moderate pain in 157 subjects (14.5%), and severe pain (4 or 5 points) in 88 subjects (8.1%).

The prevalence of KL-grade more severe side and radiographic KOA severity

The prevalence of the KL-grade severe side (i.e., whether the side with the more severe KL grade was the left or right side) and the radiographic KOA severity are summarized in Table 3.

Table 3 The prevalence of the KL-grade more severe side and the radiographic KOA severity

Association between fall history and continuous variables in T-test

In the T-test, CESD-10 and TUG were significantly higher in the positive fall experience group. Conversely, OLST were significantly lower in the positive fall experience group (Table 4).

Table 4 T-test for falls

Factors associated with fall history in univariate analysis

In univariate analyses, significant associations were found in age ≥ 75 years (OR 1.66, 95%CI: 1.08–2.56 compared to the subjects aged < 65 years), knee pain (OR 1.63, 95%CI 1.12–2.35 in mild knee pain, OR 2.00, 95%CI 1.26–3.18 in moderate knee pain, OR 4.08, 95%CI 2.44–6.82 in severe knee pain, compared to the subjects with no knee pain), depression (OR 2.20, 95%CI 1.50–3.22), decreased mobility (OR 2.51, 95%CI 1.69–3.74), and balance disability (OR 2.02, 95%CI 1.41–2.91) (Table 5).

Table 5 Univariate analysis for falls

Factors associated with fall history in multivariate analysis about KOA

The relationship between confounders (age, gender, BMI, sleeping pill use, knee pain, knee crepitus, CESD-10, TUG, OLST, and radiographic KOA severity [excluding no OA: excluding no OA pattern]) and fall history is shown in Table 6. Patterns excluding groups included in the no OA category in the radiographic KOA severity were defined as excluding no OA pattern. In the multivariate analysis, fall history was significantly associated with knee pain. Compared to subjects with no pain, the OR was 1.53 times higher in subjects with mild pain (95%CI: 1.04–2.25), 1.69 times higher in those with moderate pain (95%CI: 1.03–2.79), and 2.98 times higher in those with severe pain (95%CI: 1.67–5.30); thus, the OR increased as the pain worsened.

Table 6 Multivariate analysis for falls about KOA

In subjects with depression, the OR was 1.91 (95%CI: 1.25–2.92). Depression was also significantly associated with fall history. Moreover, in subjects with decreased mobility, the OR was 1.70 (95%CI: 1.08–2.69), and in subjects with balance disability, the OR was 1.35 (95%CI: 0.89–2.06). Decreased mobility evaluated by TUG was thus significantly associated with fall history, while balance disability evaluated by OLST was not. Age, gender, BMI, sleeping pill use, and knee crepitus were not significantly associated with decreased mobility in multivariate analysis. The results of this study demonstrated that the radiographic KOA severity was not significantly associated with subjects’ fall history (OR: 0.81, 95%CI: 0.44–1.50 in mild OA, OR: 1.10, 95%CI: 0.57–2.14 in severe OA). As the VIF of each covariate was quite low in this analysis, there was no multicollinearity between the covariates.

In the excluding no OA pattern, significant associations were found in knee pain (OR 1.58, 95%CI 1.05–2.37 in mild knee pain, OR 1.78, 95%CI 1.03–3.07 in moderate knee pain, OR 2.81, 95%CI 1.55–5.30 in severe knee pain, compared to the subjects with no knee pain), depression (OR 2.11, 95%CI 1.36–2.61), decreased mobility (OR 1.64, 95%CI 1.03–2.61). As the VIF of each covariate was quite low in this analysis, there was no multicollinearity between the covariates.

Factors associated with fall history in multivariate analysis about physical function

The relationship between confounders (age, gender, BMI, sleeping pill use, knee pain, knee crepitus, CESD-10, [TUG: excluding OLST pattern], [OLST: excluding TUG pattern], and radiographic KOA severity) and fall history is shown in Table 7. In excluding OLST pattern, significant associations were found in knee pain (OR 1.51, 95%CI 1.03–2.22 in mild knee pain, OR 1.70, 95%CI 1.03–2.80 in moderate knee pain, OR 3.11, 95%CI 1.76–5.52 in severe knee pain, compared to the subjects with no knee pain), depression (OR 1.95, 95%CI 1.27–2.97), decreased mobility (OR 1.79, 95%CI 1.14–2.80). In excluding TUG pattern, significant associations were found in knee pain (OR 1.53, 95%CI 1.04–2.25 in mild knee pain, OR 1.76, 95%CI 1.07–2.88 in moderate knee pain, OR 3.11, 95%CI 1.75–5.51 in severe knee pain, compared to the subjects with no knee pain), depression (OR 2.01, 95%CI 1.32–3.05).

Table 7 Multivariate analysis for fall about physical function

Correlation between knee pain and depression

The correlation coefficient between knee pain and depression was 0.2, with a probability (p)-value of < 0.0001.

Discussion

Our findings revealed that knee pain, decreased mobility, and depressive mood were significantly associated with a fall history. On the other hand, the radiographic KOA severity was not associated with a fall history.

Osteoarthritis has been considered an established risk factor for falls [35]. Regarding KOA, several studies [11,12,13,14,15,16,17,18,19,20,21,22,23] have obtained inconsistent results, based on different diagnoses and classifications of KOA. We analyzed the influence of radiographic KOA itself on the risk of falls, including as covariates factors that have been reported as a correlation or risk factor for falls (i.e., gender, pain, limited physical ability, and imbalance)11–23 and a psychological factor (depression) [13]. Falls exacerbate knee pain [20]. In this study, to minimize the impact of falls on regular knee pain, we assessed knee pain after the falls. Our present investigation is the first to analyze the impact of radiographic KOA on falls, taking into account not only the symptoms of KOA but also psychological factors and physical function. Our results corroborate and extend the prior studies' findings.

According to the present results, having a fall history was significantly associated with knee pain. Knee pain and other symptoms have been reported to be risk factors for falls among individuals with KOA [11, 12, 18, 20,21,22], and knee pain was significantly associated with falls in the present study as well. Pain related to OA leads to decreased use of the affected limbs and joints, muscle weakness, and poor functional performance, resulting in an increased risk of falls [16]. However, in KOA, the degree of knee pain is not necessarily related to radiographic severity [36]. In addition, we detected no significant association between radiographic KOA severity and fall history in a multivariate logistic analysis. In clinical practice, the radiographic severity tends to be more focused on the diagnosis of KOA, but we must not forget to properly evaluate knee pain when assessing its relationship to falls. Regardless of the severity of the imaging findings, the treatment of knee pain may improve an individual's risk of falling.

Our analyses revealed that decreased mobility was significantly associated with fall history. Decreased mobility has been reported as a risk factor for falls [37], which is consistent with our present observations. Our present univariate analysis detected a significant association between balance disability and fall history, but the multivariate analysis did not. In a multivariate analysis in which both OLST and TUGT variables were entered separately, we also found that decreased mobility was significantly associated with falls, but balance disability was not significantly associated with falls. This suggests that the association between balance disability and fall history was confounded by other factors. The OLST assesses static balance and is considered a strong predictor of falls [33], but the parameters of the OLST may vary between different testing sessions for the same individuals [38]. In this study, statistically, there was a significant difference in OLST between the positive fall experience group and no fall group, with lower mean values in the positive fall experience group, but the SD was larger in the positive fall experience group than in the no fall group. In other words, we showed that OLST in the positive fall experience group varied widely among individuals. Therefore, OLST may not have been extracted as a factor significantly related to falls in logistics analysis. Further, factors such as fatigue can influence the balance ability [38]. Although static balance is a clinically important factor in the risk of falling, this limited reproducibility of the OLST may have led to the lack of a significant association in the present study.

Our analyses also demonstrated a significant association between depression and fall history. Individuals with more than moderate depressive symptoms are more likely to have a fear of falling than those without depression [39], and such symptoms were reported to be associated with an increased risk of falls in the future [40]. We speculate that a fear of falling may increase in individuals with KOA as their depression worsens, eventually contributing to falls to the same degree as decreased gait and balance functions. In addition, depression is considered a potential mediator of knee pain and falls [41]. Our results indicated a significantly weak positive correlation and correlation with little clinical meaning between them (correlation coefficient; 0.2, (p)-value of < 0.0001). It should be noted that knee pain was significantly associated with falls in this study as well, and that depression itself is not only associated with falls, but may also influence falls through the mediation of knee pain. Prior research indicated that psychological factors (e.g., depression) and cognitive factors should be considered when assessing the association between KOA and falls [13]. Our present findings suggest that assessing and treating psychological factors might be important in reducing the risk of falls as well as improving pain.

We also analyzed excluding no OA pattern to account for the effects of depression and decreased mobility not associated with KOA. Our results showed that knee pain, depression, and decreased mobility affected the risk of falling, regardless of the presence or absence of a radiographic KOA.

Our results also demonstrated no significant direct relationship between radiographic KOA severity and fall history. However, it has previously been reported that the risk of falling increases with more severe KOA [20], which contradicts our results. Although KOA is usually diagnosed based on radiographic severity, symptoms of KOA do not always match imaging findings [36, 42]. Similarly, the risk of falls in KOA should not be based on imaging findings alone, but additionally include the patient's clinical symptoms, knee pain, physical function, and psychological factors.

Despite being considered risks for falls in previous studies, gender [121819], crepitus [22], and sleeping pill use [26] were not significantly associated with fall history in the present study. it has been indicated that differences in fall rates by gender may reflect differences in lifestyle [43]. Because the subjects in this study were residents of a limited rural region, their lifestyles may not have varied significantly between gender. Crepitus is reported to be poorly understood, especially among the elderly [44]. In this study, self-reports of knee crepitus may have been lower than actual. In addition, since this study was conducted at the same time as the annual health checkups, subjects may have been concerned about their health. Thus, it is possible that there were more healthy subjects and that sleeping pill use was not significantly associated with fall history. Therefore, gender, crepitus, and sleeping pill use may not have been significantly associated with fall history.

Although clinical symptoms and image findings of KOA patients are often the clinical focus, we must not forget to evaluate psychological factors (such as depressive symptoms) and physical function. Regardless of the radiographic KOA severity, the treatment of knee pain and treatment for depression and reduced mobility may reduce the risk of falls. Our present findings provide key points for clinical practice because they show the importance of therapeutic interventions for knee pain, depression, and mobility in preventing falls in the elderly. Further research and intervention studies are required to test our present findings.

Several study limitations must be addressed. First, because this study was a cross-sectional analysis, a causal relationship cannot be determined. Second, we were unable to include polypharmacy, malnutrition, smoking, alcohol consumption, stroke, and Parkinson's disease, which are commonly considered risk factors for falls26, in our analysis. Third, we did not investigate the subjects' detailed history of treatment for KOA, which might have affected their symptoms. Fourth, in this study, because plain radiographs of the knee, responses to the questionnaire, and physical function assessment were optional, subjects enrolled in the study differed significantly from those excluded in demographic and clinical variables. Many symptomatic or health-conscious subjects may have participated, possibly biasing the study. The generalizability of the results must be carefully considered. Finally, a subject's fall history may be more excessive or may be insufficient compared to the actual fall history, due to recall bias.

Conclusions

In conclusion, the results of this study demonstrated that knee pain, decreased mobility, and depression were significantly associated with a history of falling and hence, a risk of future falls. However, the radiographic KOA severity was not significantly associated with fall history. Regardless of the patients' radiographic KOA severity, their risk of falling may be reduced by treating their knee pain, improving their mobility function, and addressing psychological factors.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

QOL:

Quality of life

KOA:

Knee osteoarthritis

LOHAS:

The Locomotive Syndrome and Health Outcome in Aizu Cohort Study

BMI:

Body mass index

CESD-10:

Center of Epidemiologic Studies Depression Scale-10

TUG:

Timed Up and Go Test

OLST:

One-Leg Standing test

VIF:

Variance inflation factor

OR:

Odds ratio

References

  1. Bergen G, Stevens MR, Burns ER. Falls and fall injuries among adults aged ≥65 years – United States, 2014. MMWR Morb Mortal Wkly Rep. 2016;65:993–8.

    Article  PubMed  Google Scholar 

  2. Burns ER, Stevens JA, Lee R. The direct costs of fatal and non-fatal falls among older adults – United States. J Safety Res. 2016;58:99–103.

    Article  PubMed  PubMed Central  Google Scholar 

  3. Tinetti ME,Mendes de Leon CF, Doucette JT, et al. Fear of falling and fall-related efficacy in relationship to functioning among community-living elders. J Gerontol. 1994;49:140–7.

    Article  Google Scholar 

  4. Polinder S, Haagsma J, Panneman M, et al. The economic burden of injury: Health care and productivity costs of injuries in the Netherlands. Accid Anal Prev. 2016;93:92–100.

    Article  PubMed  Google Scholar 

  5. Cross M, Smith E, Hoy D, Nolte S, Ackerman I, Fransen M, Bridgett L, Williams S, Guillemin F, Hill CL, Laslett LL, Jones G, Cicuttini F, Osborne R, Vos T, Buchbinder R, Woolf A, March L. The global burden of hip and knee osteoarthritis: estimates from the global burden of disease 2010 study. Ann Rheum Dis. 2014;73(7):1323–30.

    Article  PubMed  Google Scholar 

  6. Dillon CF, Rasch EK, Gu Q, et al. Prevalence of knee osteoarthritis in the United States: Arthritis data from the Third National Health and Nutrition Examination Survey 1991–94. J Rheumatol. 2006;33:2271–9.

    PubMed  Google Scholar 

  7. Alshami AM. Knee osteoarthritis related pain: A narrative review of diagnosis and treatment. Int J Health Sci (Qassim). 2014;8:85–104.

    PubMed  Google Scholar 

  8. Wang C, Iversen MD, McAlindon T, et al. Assessing the comparative effectiveness of Tai Chi versus physical therapy for knee osteoarthritis: Design and rationale for a randomized trial. BMC Complement Altern Med. 2014;14:333.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  9. Benito MJ, Veale DJ, FitzGerald O, van den Berg WB, Bresnihan B. Synovial tissue inflammation in early and late osteoarthritis. Ann Rheum Dis. 2005;64:1263–7.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  10. Sutbeyaz ST, Sezer N, Koseoglu BF, et al. Influence of knee osteoarthritis on exercise capacity and quality of life in obese adults. Obesity. 2007;15:2071–6.

    Article  PubMed  Google Scholar 

  11. Foley SJ, Lord S, Srikanth V, et al. Falls risk is associated with pain and dysfunction but not radiographic osteoarthritis in older adults: Tasmanian Older Adult Cohort Study. Osteoarthritis Cartilage. 2006;14:533–9.

    Article  CAS  PubMed  Google Scholar 

  12. Muraki S, Akune T, Oka H, et al. Prevalence of falls and the association with knee osteoarthritis and lumbar spondylosis as well as knee and lower back pain in Japanese men and women. Arthritis Care Res. 2011;63:1425–31.

    Article  Google Scholar 

  13. Mat S, Tan PJ, Ng CT, et al. Mild joint symptoms are associated with lower risk of falls than asymptomatic individuals with radiological evidence of osteoarthritis. PLoS ONE. 2015;10: e0141368.

    Article  PubMed  PubMed Central  Google Scholar 

  14. Khalaj N, Abu Osman NA, Mokhtar AH, et al. Balance and risk of fall in individuals with bilateral mild and moderate knee osteoarthritis. PLoS ONE. 2014;9:e92270.

    Article  PubMed  PubMed Central  Google Scholar 

  15. Harris R, Strotmeyer ES, Sharma L, et al. The association between severity of radiographic knee OA and recurrent falls in middle and older aged adults: The Osteoarthritis Initiative. J Gerontol A Biol Sci Med Sci. 2023;78:97–103.

    Article  PubMed  Google Scholar 

  16. Doré AL, Golightly YM, Mercer VS, et al. Lower-extremity osteoarthritis and the risk of falls in a community-based longitudinal study of adults with and without osteoarthritis. Arthritis Care Res. 2015;67:633–9.

    Article  Google Scholar 

  17. Cai G, Li X, Zhang Y, et al. Knee symptom but not radiographic knee osteoarthritis increases the risk of falls and fractures: Results from the Osteoarthritis Initiative. Osteoarthritis Cartilage. 2022;30:436–42.

    Article  CAS  PubMed  Google Scholar 

  18. Scott D, Blizzard L, Fell J, et al. Prospective study of self-reported pain, radiographic osteoarthritis, sarcopenia progression, and falls risk in community-dwelling older adults. Arthritis Care Res. 2012;64:30–7.

    Article  Google Scholar 

  19. Barbour KE, Sagawa N, Boudreau RM, et al. Knee osteoarthritis and the risk of medically treated injurious falls among older adults: A community-based US cohort study. Arthritis Care Res. 2019;71:865–74.

    Article  Google Scholar 

  20. Tsonga T, Michalopoulou M, Malliou P, et al. Analyzing the history of falls in patients with severe knee osteoarthritis. Clin Orthop Surg. 2015;7:449–56.

    Article  PubMed  PubMed Central  Google Scholar 

  21. Arden NK, Crozier S, Smith H, et al. Knee pain, knee osteoarthritis, and the risk of fracture. Arthritis Rheum. 2006;55:610–5.

    Article  PubMed  Google Scholar 

  22. van Schoor NM, Dennison E, Castell MV, et al. EPOSA Research Group. Clinical osteoarthritis of the hip and knee and fall risk: The role of low physical functioning and pain medication. Semin Arthritis Rheum. 2020;50:380–6.

    Article  PubMed  PubMed Central  Google Scholar 

  23. Prieto-Alhambra D, Nogues X, Javaid MK, et al. An increased rate of falling leads to a rise in fracture risk in postmenopausal women with self-reported osteoarthritis: A prospective multinational cohort study (GLOW). Ann Rheum Dis. 2013;72:911–7.

    Article  PubMed  Google Scholar 

  24. Jiao J, Tang H, Zhang S, et al. The relationship between mental health/physical activity and pain/dysfunction in working-age patients with knee osteoarthritis being considered for total knee arthroplasty: A retrospective study. Arthroplasty. 2021;3:22.

    Article  PubMed  PubMed Central  Google Scholar 

  25. Otani K, Takegami M, Fukumori N, et al. Locomotor dysfunction and risk of cardiovascular disease, quality of life, and medical costs: Design of the Locomotive Syndrome and Health Outcome in Aizu Cohort Study (LOHAS) and baseline characteristics of the study population. J Orthop Sci. 2012;17:261–71.

    Article  PubMed  Google Scholar 

  26. Xu Q, Ou X, Li J. The risk of falls among the aging population: A systematic review and meta-analysis. Front Public Health. 2022;10:902599.

    Article  PubMed  PubMed Central  Google Scholar 

  27. Radloff LS. The CES-D scale: A self-report depression scale for research in the general population. Appl Psychol Meas. 1977;1:385–401.

    Article  Google Scholar 

  28. Andresen EM, Malmgren JA, Cater WB, et al. Screening for depression in well older adults: Evaluation of short form of the CESD-D (Center for Epidemiologic Studies Depression scale). Am J Prev Med. 1994;10:77–84.

    Article  CAS  PubMed  Google Scholar 

  29. Kellgren JH, Lawrence JS. Radiological assessment of osteo-arthrosis. Ann Rheum Dis. 1957;16:494–502.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  30. Gossec L, Jordan JM, Mazzuca SA, et al. OARSI-OMERACT task force “total articular replacement as outcome measure in OA”. Comparative evaluation of three semi-quantitative radiographic grading techniques for knee osteoarthritis in terms of validity and reproducibility in 1759 X-rays: Report of the OARSI-OMERACT task force. Osteoarthritis Cartilage. 2008;16:742–8.

    Article  CAS  PubMed  Google Scholar 

  31. Podsiadlo D, Richardson S. The timed “Up & Go”: A test of basic functional mobility for frail elderly persons. J Am Geriatr Soc. 1991;39:142–8.

    Article  CAS  PubMed  Google Scholar 

  32. Jeong SM, Shin DW, Han K, et al. Timed up-and-go test is a useful predictor of fracture incidence. Bone. 2019;127:474–81.

    Article  PubMed  Google Scholar 

  33. Karkkainen M, Rikkonen T, Kroger H, et al. Association between functional capacity tests and fractures: An eight-year prospective population-based cohort study. Osteoporos Int. 2008;19:1203–10.

    Article  CAS  PubMed  Google Scholar 

  34. Lundin H, Saaf M, Strender LE, et al. One-leg standing time and hip-fracture prediction. Osteoporosis Int. 2014;25:1305–11.

    Article  CAS  Google Scholar 

  35. American GS. Summary of the Updated American Geriatrics Society/British Geriatrics Society Clinical Practice Guideline for Prevention of Falls in Older Persons. J Am Geriatr Soc. 2011;59:148–57.

    Article  Google Scholar 

  36. Cubukcu D, Sarsan A, Alkan H. Relationships between pain, function and radiographic findings in osteoarthritis of the knee: a cross-sectional study. Arthritis. 2012;2012:984060.

    Article  PubMed  PubMed Central  Google Scholar 

  37. Davis JC, Best JR, Bryan S, et al. Mobility is a key predictor of change in well-being among older adults who experience falls: Evidence from the Vancouver Falls Prevention Clinic Cohort. Arch Phys Med Rehabil. 2015;96:1634–40.

    Article  PubMed  PubMed Central  Google Scholar 

  38. Larsson BAM, Johansson L, Mellström D, et al. One leg standing time predicts fracture risk in older women independent of clinical risk factors and BMD. Osteoporosis Int. 2022;33:185–94.

    Article  CAS  Google Scholar 

  39. van Haastregt JC, Zijlstra GA, van Rossum E, et al. Feelings of anxiety and symptoms of depression in community-living older persons who avoid activity for fear of falling. Am J Geriatr Psychiatry. 2008;16:186–93.

    Article  PubMed  Google Scholar 

  40. Friedman SM, Munoz B, West SK, et al. Falls and fear of falling: Which comes first? A longitudinal prediction model suggests strategies for primary and secondary prevention. J Am Geriatr Soc. 2002;50:1329–35.

    Article  PubMed  Google Scholar 

  41. Ribeiro IC, Coimbra AMV, Costallat BL, Coimbra IB. Relationship between radiological severity and physical and mental health in elderly individuals with knee osteoarthritis. Arthritis Res Ther. 2020;22(1):187.

    Article  PubMed  PubMed Central  Google Scholar 

  42. Mat S, Razack AH, Lim J, et al. Factors determining the increased risk of falls in individuals with knee pain in the Malaysian Elders Longitudinal Research (MELoR) Study. Front Med. 2019;6:277.

    Article  Google Scholar 

  43. Chang VC, Do MT. Risk factors for falls among seniors: implications of gender. Am J Epidemiol. 2015;181:521–31.

    Article  PubMed  Google Scholar 

  44. Robertson CJ, Hurley M, Jones F. People’s beliefs about the meaning of crepitus in patellofemoral pain and the impact of these beliefs on their behaviour: a qualitative study. Musculoskelet Sci Pract. 2017;28:59–64.

    Article  PubMed  Google Scholar 

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Acknowledgements

We thank the staff of the Tadami Town Office, Minamiaizu Town Office, and Institute for Health Outcomes and Process Evaluation Research for their help with participant recruitment and data acquisition. We also thank all of the subjects who agreed to participate in this study. We thank the Japanese Orthopaedic Association (JOA-Subsidized Science Project Research 2022-1).

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Authors

Contributions

TS, KOtani, MSekiguchi, and KOtoshi had full access to all the data in this study. TS was responsible for the accuracy of data analysis. Concept and design: TS, KOtani, MSekiguchi, and KOtoshi. Data acquisition, analysis, and interpretation: TS, KOtani, MSekiguchi, KOtoshi, TN, MSato, SK and YM. Drafting of the manuscript: TS. Critical revisions: TS, KOtani, MS, KOtoshi, TN, MSato, SK and YM. Statistical analysis: TS, KOtani, MSekiguchi.

Corresponding author

Correspondence to Koji Otani.

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Ethics approval and consent to participate

Written informed consent for the use of data collected in LOHAS was obtained from all participants upon enrollment. The present study complied with the Declaration of Helsinki and was approved by the Research Ethics Committee of Fukushima Medical University (No. 673).

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Not applicable.

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The authors declare no competing interests.

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Sonobe, T., Otani, K., Sekiguchi, M. et al. Radiographic knee osteoarthritis severity has no impact on fall risk: the locomotive syndrome and health outcomes in the aizu cohort study (LOHAS): a cross-sectional study. BMC Musculoskelet Disord 25, 298 (2024). https://doi.org/10.1186/s12891-024-07421-1

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