- Research article
- Open Access
Dynamic balance in patients with degenerative lumbar spinal stenosis; a cross-sectional study
BMC Musculoskeletal Disorders volume 19, Article number: 192 (2018)
Degenerative lumbar spinal stenosis (LSS) is a prevalent condition in adults over the age of 55 years. The condition is associated with activity limitations that are related to increased pain when engaging in weight-bearing activities, such as walking and standing, and release of pain while sitting down or bending forward. The limitation on ambulation is also associated with impaired balance although the types of balance problems are sparsely described in this patient group. The purpose of this study was to assess dynamic balance in persons with LSS by the Mini-BESTest and explore the associations with self-reported balance and functional disability.
Sixty two participants were included in this cross-sectional study. The main outcome measure was the Mini-BESTest, providing a total score and sub-scores for 4 balance control systems (Anticipatory Adjustment, Reactive Response, Sensory Orientation, Stability of Gait). The Swiss Spinal Stenosis Questionnaire provided sub-scores for self-reported balance problems and walking function (FUNC).
The participants showed large inter-individual variation in all measures of balance. The Mini-BESTest score ranged from very good to poor and the mean value was 22.8 (SD 3.5). Nineteen participants (31%) reported having frequent balance problems. Logistic regression analyses showed that both the total Mini-BESTest score (OR (95% CI) 1.6 (1.2, 2.0)(P = .001) and 3 of the 4 balance control systems (Anticipatory Adjustment, Sensory Orientation, Stability in Gait) were significantly associated with self-reported balance problems (.001 ≤ P ≤ .01). The strongest association was seen between Sensory Orientation and balance problems, implying that it is 4.4 times more likely that persons would have no or occasional balance problems with each unit of increase in Sensory Orientation. The total score for the Mini-BESTest was significantly associated with FUNC (P = .042).
The dynamic balance of persons with LSS showed a large heterogeneity with a large fraction of the participants displaying no balance impairments. The test results were associated with the participants’ self-reported balance problems and walking function. The Mini-BESTest thus appears to provide additional information to self-reported disability, and by identifying different kind of balance control impairments, the Mini-BESTest could be useful for physiotherapists working with person-centered rehabilitation in persons with LSS.
Degenerative lumbar spinal stenosis (LSS) is a common condition among older adults . The main functional problem for persons diagnosed with LSS is walking limitations due to increased pain and/or paresthesia in their feet as a result of prolonged walking [2, 3]. These individuals also commonly report problems with balance [4,5,6,7,8]. Based on single performance tests of balance, previous studies have identified balance limitation in 40–65% of persons with LSS [9,10,11]. Hence, a substantial fraction appears to have no problems compared to population of same age. Observations of wide-based gait, which is one of the characteristics of persons with LSS , indicate that their dynamic balance is also limited . In a recent study, we showed that a relatively high proportion of persons with LSS were unable to complete the tandem walk (39%) and the one-leg stance (weight-transfer from 2 legs to a single leg) (58%), while relatively few were unable to complete the Romberg maneuver (7%) . Moreover, the results indicate a large variation in balance problems among LSS patients. Dynamic balance limitation is also documented in the study by Kim et al., who conclude that persons with LSS have a higher risk of falling than persons with osteoarthritis in the knees . Furthermore, Passmore et al. found that persons with LSS spent more time planning and performing challenging lower limb movements than healthy adults .
Although balance problems are common among persons with LSS, the disability has received little attention in guidelines for assessment and treatment [15,16,17,18]. Conservative management, which is recommended as the initial treatment, includes widely varying approaches, such as strength training, coordination and endurance exercises, stretching, mobilization, and patient education and counseling. A systematic assessment is essential for the management of such persons’ balance problems in clinical practice. A key factor in person-centered decisions is to identify the patient’s individual limitations and impairments. Previous studies of balance in persons with LSS have either used single physical performance measures [6, 9] or advanced technical equipment . The introduction of “The Balance System Evaluation Test”, developed by Horac and co-workers, is frequently used in assessing balance disability in older adults and persons with Parkinson’ disease or stroke [19,20,21,22,23]. This comprehensive test assesses the underlying mechanisms in the balance control systems, and the test results can be useful in selecting interventions in the rehabilitation process of persons who have different limitations on postural responses, including patients with LSS. The original test was rather time-consuming and consisted of 36 items, grouped into 6 control systems. It was developed to assess balance in persons with neurological diseases. A shortened version, the Mini-BESTest, with 14 items/tests, was presented in 2010 . These 14 tests primarily assess dynamic balance reflecting balance challenges during everyday activities and provide a total score as well as 4 sub-scores for the different balance control systems: 1) the anticipatory activation system (the ability to pre-activate the musculoskeletal system when planning a movement), 2) reactive responses (the ability to counteract external disturbances), 3) sensory orientation (proprioceptive and visual adjustment in postural control), and 4) stability in gait (the ability to perform dual tasks, e.g., to cross an obstacle, turn the head, or count while walking). Since the Mini-BESTest captures limitations in the different underlying balance control systems, we hypothesized that the test could be used to provide new understandings of balance in persons with symptomatic LSS, and that the responses could be useful in planning relevant treatment for the persons with LSS.
This study had three objectives. The first was to assess dynamic balance in a group of persons with LSS using the Mini-BESTest. The second objective was to examine how the four balance control systems relate to the self-reported frequency of balance problems. The third objective was to examine the associations between dynamic balance and self-reported measures of function and disability.
During 2013, 62 participants with MRI-verified LSS were recruited from an outpatient clinic in a hospital in specialized health care in Norway. To be eligible for inclusion to the study the person had to be older than 55 years, understand oral and written Norwegian, and have symptomatic and radiologically verified degenerative central LSS. Participants were excluded from participation if they had co-morbidities that could affect their physical performance, such as neurological or rheumatologic diseases, painful osteoarthritis in the lower limbs, vestibular-neuritis, or peripheral vascular diseases. After being identified from the hospital’s waiting lists, the participants received an information letter with an invitation to participate in the study. After giving oral approval by telephone, the participants received and completed a written consent form. The local hospital board and the Regional Ethics Committee approved the study (REK: 2010/2907a), as the human rights of the participants were protected.
To ensure broad representation of the patient population, we consecutively included participants a) referred to surgery and poor physical function, b) referred to surgery and moderate physical function, and c) not referred to surgery. Physical function was assessed using the Physical Functioning (FUNC) scale from the Swiss Spinal Stenosis Questionnaire (see below). Poor physical function was defined as FUNC≥2.6 and moderate was defined as FUNC< 2.6 . We aimed for a sample size of at least 60 participants  (Fig. 1).
The participants completed a comprehensive questionnaire before the physical assessment, including questions about personal characteristics such as gender, age, weight, height, smoking habits, and duration of actual low back pain and lower limb pain. All participants were tested by one of three research assistants at the hospital, blinded for disability level and appraisal for surgery, who were trained in using the test protocol. Both participants and assistants were instructed not to discuss the following treatment. Consensus was reached among the assessors on how to conduct the tests before inclusion started. Each test session took approximately 20 min.
The test consists of 14 tasks covering dynamic control in maintaining posture/balance, scored on a 3-level ordinal scale (Table 1) [24, 27, 28]. The total score range is 0–28, with the highest score understood as normal/good postural control. A cut-off of 21 is reported to differentiate between people with and without impaired postural responses .
The reliability of the Mini-BESTest, both inter-rater and test-retest reliability, is reported to be excellent, with ICCs of 0.98 (0.97–0.99) and 0.96 (0.94–0.99), respectively . The content validity is also reported to be high [24, 31]. The minimal clinically important difference (MCID) is 4 points . The sub-scores for the items in each of the 4 control systems range from 0 to 6 (Anticipatory Adjustment, Reactive Response, and Sensory Orientation) and from 0 to 10 (Stability in Gait).
The comprehensive questionnaire also consisted of a cluster of validated self-reported measures. The disease-specific signs were assessed using the Symptom Severity (SYMP) and FUNC scales, 2 of 3 subscales in the Swiss Spinal Stenosis Questionnaire (SSQ) . The seven questions in SYMP addresses overall pain, pain frequency, pain in the back, pain in the leg, numbness, weakness and balance disturbance and is scored as an un-weighted mean, range 1–5 (1 = no symptoms, 2 = mild symptoms, 3 = moderate symptoms, 4 = severe symptoms, 5 = very severe symptoms). FUNC has 5 questions asking about walking distance and ability to walk for pleasure, for shopping, and getting around in the house/apartment, and from bathroom to bedroom. The score range is 1–4 (1 = Yes, comfortably; 2 = yes, sometimes with pain; 3 = yes, always with pain; 4 = no, cannot perform).
Pain-related disability was measured using the Oswestry Disability Index (ODI), with a score range of 0–100 (100 = worst) . The ODI evaluates the impact of back pain on daily living activities .
Pain intensity was recorded using 2 numeric rating scales (NRS) for lumbar and lower limb pain, respectively, (0–10, where 10 = worst imaginable pain). Health-related quality of life was assessed using the European Quality of Life Questionnaire,(EQ5D) providing a utility measure (0–1, where 0 = worst) . Hopkins Symptom Checklist (HSCL-25) was used to examine distress (1–4, where 4 = worst) .
The participants’ characteristics and results from the Mini-BESTest are described by frequencies, percentages, means with standard deviations (SD) and minimum-maximum (Min-Max) where appropriate. The 7th item of the SYMP scale is a question about balance: “In the last, how would you describe problems with your balance? Yes, often I feel my balance is off, or that I am not sure-footed/ Yes, sometimes I feel my balance is off, or that I am not sure-footed/ No, I’ve had no problems with balance?”32 Based on the response on this question, the participants were divided into 3 groups. Group 0: Participants without balance problems; Group 1: Participants with balance problems sometimes; and Group 2: Participants with balance problems often.
Univariate analyses of variance were carried out to assess differences between the three balance groups (Group 0–2) with Games-Howell post hoc tests The associations between the self-reported and the performance-based variables were assessed by bivariate correlations (Spearman’s Rho). The strength in the correlation are defined as weak (.10–.29), medium (.30–49) and large (.50–1.0) .
Binary logistic regression analyses were used to explore the associations between balance problems and the Mini-BESTest, and each of the 4 control systems separately. For these analyses, a dichotomous variable (Balance_2) was constructed, merging Group 0 and 1 (coded 1), leaving those with frequent balance problems in a separate group (coded 0). Associations between FUNC and ODI as dependent variables and the Mini-BESTest results were examined using linear regression models. Age, gender, and body mass index (BMI) were entered as covariates in the adjusted models, since these variables have previously been shown to be associated with ambulatory ability , physical function , and the condition of clinical LSS .
SPSS (IBM) version 23 was used in all analyses and a value of P < .05 was used as the significance level.
In all, 62 participants with LSS, 47% of them female, were included in the study. The mean (min-max) age was 71.2 (56–83) years and mean BMI (kg/m2) was 28.5 (19–42). The participants displayed large variation in all self-reported measures of symptoms and disability (Table 2), with no gender differences (P > .08); 19 of the participants had frequent balance problems (Group 2), whereas 29 had balance problems sometimes (Group 1), and 14 participants reported having no balance problems (Group 0).
Statistical differences between the groups were found for BMI, FUNC, SYMP, ODI, and lumbar pain (0.001 < P ≤ 0.036) (Table 2). For all these variables, Group 2 displayed the lowest mean values, whereas no systematic differences were observed between Groups 0 and 1. For the total score of the Mini-BESTest, statistically significant differences were found between the participants in Gr2 and the two other groups; for Gr1 P = .032 and for Gr0 P = .006. There were no statistical differences between the groups in relation to age, gender, lower limb pain, EQ5D, or HSCL25 (P > 0.1). The participants showed low mental distress with mean HSCL25 scores of 1.5 or lower in all 3 groups.
Dynamic balance assessed by the mini-BESTest
All participants completed the tests safely without falling, and no participant asked for the testing to be stopped or needed walking aid. The mean (SD) score for all participants in the Mini-BESTest was 22.8 (3.5). In all 3 balance groups, at least 50% scored above 21 and were thus within the normal range (Fig. 2).
However, statistically significant group differences were found for the total score on the Mini-BESTest (P = .002). The female participants scored significantly more poorly than male participants (mean difference − 1.8, and 95%CI -3.5,-0.1), P = .038.
For 3 of the control systems: Anticipatory Adjustment, Reactive Response, and Sensory Orientation, there were wide inter-individual variations, but with mean values in the upper range (Table 3) (Additional file 1). For the control system Stability in Gait, all participants scored in the upper half of the scale. More than 75% of the participants were assessed as having normal performance in 4 of the 5 items in Stability in Gait, whereas only 10 (16%) of the 62 participants were assessed as having normal performance in the last dual task (timed-up-and-go test together with counting backward by 3 starting from 98). This dual task was difficult for most participants regardless of balance group.
There was large inter-individual variation within each of the 3 balance groups for most of the tests in the 4 control systems. There was a tendency, however, towards smaller proportions of participants in Group 2 with normal performance compared to the other 2 groups (Table 3). For the sub-scores for 2 control systems (Anticipatory Adjustment and Sensory Orientation), significant statistical differences were found between the 3 groups (P ≤ .002). Female participants responded more poorly than males (− 1.0 (95% CI 1.9–0.2)), P = .016 in the Reactive Response control system. Only a small fraction of the participants showed poor performance on the individual tests in the Mini-BESTest.
Associations between self-reported balance problems and test results
The Mini-BESTest showed a statistically significant association with self-reported balance problems as assessed by Balance_2 (sometimes or no balance problems versus frequent balance problems) (Rho = 0.39, P = .002) (Table 4). Significant associations were also seen between Balance_2 and 2 of the control systems: Anticipatory Adjustment (Rho = 0.33, P = .008) and Sensory Orientation (Rho = 0.45, P < .001).
The logistic regression models, adjusted for age, gender, and BMI, supported the associations shown above. The strongest association was seen between Sensory Orientation and Balance_2, implying that it is 4.4 times more likely that persons would have no or occasional balance problems with each unit of increase in Sensory Orientation (Table 5).
Associations between self-reported function and disability, and test results
FUNC and ODI were significantly associated with the total Mini-BESTest (Table 4). An association was also found between Stability in Gait and ODI (Rho = − 0.43, P < .001), whereas the correlations between FUNC and the 4 control systems were all poor and not statistically significant (Rho’s ≤ − 0.24, P > .056).
When adjusted linear regression analyses were performed, using respectively FUNC and ODI as dependent variables, the Mini-BESTest was only significantly associated with FUNC (B = − 0.1(95%CI -0.1, − 0.02), P = .042). The participants dynamic balance explained 16.7% of the variation in FUNC (r2 = 0.167) adjusted for age, gender and BMI. The control system Stability in Gait showed significant association with ODI in the adjusted models, with BMI as a significant covariate (Table 6).
The results of the present study show that participants with LSS have large inter-individual variation in balance as assessed by the Mini-BESTest, although most of the participants displayed rather good dynamic balance. The participants who reported having frequent balance problems had poorer dynamic balance than the participants who reported sometimes or no balance problems. Self-reported balance problems were significantly associated with poorer scores on the Mini-BESTest, as was the case for the control systems; Anticipatory Adjustment, Sensory Orientation, and Walking Stability in Gait. The Mini-BESTest was weak, though statistical significantly associated with self-reported physical function (FUNC).
The participants with LSS in the present study had almost identical mean scores (22.8) on the Mini-BESTest compared to healthy Canadian adults (mean 22.9 for the age group 60–80)  . The participants without balance problems in our study had better balance capacity (mean 24.4) than the Canadian reference group, whereas those who experienced balance problems had lower scores (mean 20.5). Among persons with Parkinson’s disease of comparable age to the participants in the present study, fallers and non-fallers scored 14 (SD 6.2) and 23 (SD 5.5) points, respectively, on the Mini-BESTest.  These results show that persons with lumbar spinal stenosis do not necessarily have impaired balance when tested with the Mini-BESTest.
Even though the Mini-BESTest scores for the participants with balance problems were lower than for the other 2 groups, these participants also showed large inter-individual variation in balance capacity. As shown in Fig. 2, maximum scores were found in all groups, and at least 50% of participants in all 3 groups scored above the threshold for impaired postural response . Similarly, Leddy and co-workers found large variation among both the fallers and non-fallers among persons with Parkinson’s disease . Our results also showed large variability for the subsystems, underlining that persons with LSS constitute a heterogeneous group with regard to dynamic balance. We used the balance question from the disease specific SSQ, asking for frequency of balance problems. The test results showed large heterogeneity in the group of participants with frequent balance problems and may imply that this question was unprecise. One additional question of severity or fall-tendency could probably have nuanced the description of the balance problems and shown stronger association with the test results.
The results in the present study suggest that the Mini BESTest could provide useful information about balance in persons with LSS, important for clinicians, and thus improve the clinicians ability to identify specific control systems that contribute to limitation of individual balance capacity. This information might be helpful in improving or developing more targeted physiotherapy interventions. As the test battery does not require special equipment and can be completed in an acceptable time, makes it usable in clinical settings and individualized and person-centred rehabilitation interventions can be achieved.
Walking-induced pain and balance problems have been presented as the primary factors limiting ambulation in persons with LSS.  The associations between balance responses and self-reported measures investigated in this study have elucidated this further. The disease-specific FUNC, which mainly reflects degree of pain while walking, was associated with the total Mini-BESTest and not specifically with any of the control systems, which suggests that walking limitations in persons with LSS may be related to several balance control systems. The subsystem Stability in Gait was significantly associated with both balance problems and ODI. This corresponds well with the study by Passmore and co-workers, which showed that, for persons with symptomatic LSS, complementary movements are challenging .
Lumbar spinal stenosis has both anatomical and clinical definitions. We decided to use a disease-specific questionnaire to reveal the participants clinical status rather than the degree spine degeneration. The relationship between clinical symptoms or disability and the degree of radiologically verified constriction in the spinal canal is still unclear [43, 44].
The present study has some limitations. Measurement of balance by performance tests such the Mini-BESTest will always include an intra-individual variation. Hence, the tests may not always capture the typical condition for the patient. There will also be a certain variation in judgement of performance by the assessors. The latter was reduced as much as possible by training of the raters. To ensure the quality of the evaluation of the balance performances and diminishing the variation in the observations, the three assessors were trained in their observation skills and in using the test protocol. Another limitation is the small sample size. A larger number of participants would have provided more robust results and enabled us to perform other sub-group analyses, as well as more in-depth analyses of the balance responses. With a larger sample, multiple factors as MRI- findings, EQ5D and HSCL25 could have been entered adjusted regression analyses and explained more of the variation in the dependent variables.
The Mini-BESTest revealed a large variation in dynamic balance from very good to poor in persons with LSS. The test results were associated with the participants’ self-reported balance problems and with walking function (FUNC), although a large fraction of the participants displayed to have good balance. The performance test thus appears to provide additional information to self-reported balance problems in persons with LSS. By identifying different kinds of balance limitations, the Mini-BESTest could provide results useful for physiotherapists working with person-centered rehabilitation in persons with LSS.
Body Mass Index (kg/m2)
Spinal stenosis questionnaire, physical function
Numeric rating scale
Oswestry Disability Index
Spinal stenosis questionnaire, symptom severity
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The authors are grateful to the participants for agreeing to take part. Without them this work would have been impossible. We would also like to thank our three research assistants: Ove Bjørnstad (PT), Vivian Tryving Hornburg (OT), and Birgitte Holt Olsen (PT), who provided all the test results. The manuscript was copyedited by Douglas Ferguson.
The research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Availability of data and materials
All relevant data supporting the conclusions are included within the article and tables. The dataset used and analyzed during the current study are available from the corresponding author on reasonable request.
Ethics approval and consent to participate
The study was approved by the Norwegian Ethical Committee (protocol number (REK: 2010/2907). All participating patients provided written informed consent.
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Table S1. Responses at each of the 14 items in the Mini-BESTest (N = 62). (Group 2 = often balance problems, Group1 = sometimes balance problems, Group 0 = no balance problems). (PDF 285 kb)
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Thornes, E., Robinson, H.S. & Vøllestad, N.K. Dynamic balance in patients with degenerative lumbar spinal stenosis; a cross-sectional study. BMC Musculoskelet Disord 19, 192 (2018). https://doi.org/10.1186/s12891-018-2111-x