Total hip replacement in adult patients with severe Kashin-Beck disease of the hip
- Xin Tang†1,
- Jing Zhu†2,
- Zongke Zhou1Email author,
- Bin Shen1,
- Pengde Kang1,
- Fuxing Pei1Email author and
- Jian Li1
© The Author(s). 2016
Received: 26 January 2016
Accepted: 9 June 2016
Published: 15 July 2016
The treatment of elderly patients with Kashin-Beck disease (KBD) remains clinically challenging, and clinical data are very lacking. The aim of this study was to retrospectively evaluate pain and functional outcomes following total hip replacement in adult patients with severe KBD of the hip.
Twenty-two patients (32 hips) with KBD underwent primary hip replacement and were followed for at least 2 years. Radiographic and Clinical assessments were evaluated for each patient at 2 and 4 weeks and at 3, 6 and 12 months after the operation and annually thereafter. The efficacy index included the visual analogue scale (VAS) score, Harris hip score, functional score for adult Tibetans with Kashin-Beck Disease (FSAT-KBD) and radiographic outcomes.
The patients underwent a follow-up, and the mean follow-up time was 3.8 years. VAS scores significantly decreased within the first 6 months postoperatively. This decrease continued until the final follow-up (p < 0.01). This result was supported by a significant increase in the Harris and FSAT-KBD scores after the surgery (p < 0.01). At the final follow-up, there was no change in prosthesis positioning or radiographic evidence of prosthesis loosening. One case received impacted allograft bone croutons and had worn polyethylene components replaced after 6 years because the patient suffered severe pelvic and femoral osteolytic lesions postoperatively.
Hip replacement can relieve pain and improve joint function in treating severe KBD hip. Additional studies that are more extensive are needed to confirm the findings of our study.
KeywordsKashin-Beck disease Replacement Hip
Kashin-Beck disease (KBD) is an endemic, chronic, osteoarticular disease that mainly occurs in China, Siberia and North Korea . A recent study showed that there are more than 695,000 patients with KBD and that 105.84 million people are at risk for KBD in the endemic area of China . KBD usually afflicts children between the ages of 3 and 12 years and becomes symptomatic in adults . Although KBD has been studied for more than 100 years, little is known about its etiology. The current suspected causes mainly involve cereal contamination by mycotoxin-producing fungi, trace element nutritional deficiencies (selenium and iodine), high levels of fulvic acid in drinking water and harsh physical environments in the endemic areas [4–9].
The basic pathological feature of KBD is focal chondrocyte necrosis in multiple areas of hyaline cartilage, including articular cartilage and growth plates. The secondary pathological findings of KBD are the presence of repair and remodeling around the necrotic foci of the cartilage of the metaphysic and epiphysis, which can result in growth retardation, secondary degradation of cartilage and disability in the advanced stages of the disease, similar to that in osteoarthritis (OA) [10–12].
Presently, no effective clinical measures can repair the cartilage damage or defects caused by KBD. Most treatment methods are derived from experience with OA treatment. The administration of non-steroidal anti-inflammatory drugs (NSAIDs), intra-articular injections of hyaluronic acid and physical therapy could reduce knee pain and/or improve knee joint function for elderly KBD patients prior to the advanced stage of KBD. However, these treatments do little to improve joint function and do not achieve long-term efficacy in end-stage KBD knee joints [15–18]. Moreover, only minimal data are available regarding improving the function of the hips in patients with severe KBD, especially when their hips have progressed to deformity.
Total hip replacement is a surgical procedure that has been shown to be very successful in relieving pain and physical functionality in older patients with advanced hip osteoarthritis (OA). In the United States, approximately 200,000 people receive total hip replacement every year , and that number is projected to increase to no less than 500,000 in 2030 [20, 21]. The Swedish Hip Arthroplasty Register reported that the 10-year survival rate of total hip replacement reached 96 % in both 2000 and 2002. In several studies, a 100 % survival rate has been achieved . Few studies have reported clinical results in the treatment of late-stage KBD patients with total hip replacement. In this study, we retrospectively determined the effectiveness of total hip replacement for treating advanced hip disease (Kellgren-Lawrence (K-L) radiographic grade IV) in adult KBD patients and provided clinical data for the treatment of hip KBD in the future .
This study was conducted at the Department of Orthopedics of West China Hospital of Sichuan University and was approved by the internal research administration department and ethics committee in accordance with the Helsinki Declaration. All the patients provided informed consent prior to enrollment in the study.
Patients were included if they had been symptomatic for no less than 6 months before enrollment, had experienced pain of more than 60 mm on a 100-mm visual analogue pain scale (VAS; 0 mm representing no pain and 100 mm representing the worst imaginable pain) in the target hip joint during assessment of the patient while walking, could not walk on a level floor for more than 200 m because of pain in the target hip, and had a K-L radiographic grade of more than III in the target hip . Patients were excluded from the study for any unstable medical condition from a total hip replacement for the treatment of OA, such as inflammation, infection and abnormal vital signs.
At the time of screening, the medical history of each patient was recorded. A complete physical examination, particularly focused on the target hip and other affected joints, and laboratory assessments were performed. A radiograph of the target hip was also taken. Clinical diagnoses of KBD were made based on previously described clinical criteria by at least two senior orthopedic surgeons from the Orthopedics Department at the West China Hospital, West China Medical School, Sichuan University [11, 24].
KBD patients characteristics (n = 22, 32 hips)
Mean ± SD/ratio
Age, yrs, mean ± SD
52.07 ± 17.46
23.85 ± 6.76
Side, R: L
Num of affected big joints
8.15 ± 4.25
KBD Stage, n (%)
9 (40.9 %)
11 (50.0 %)
2 (9.1 %)
Patient-assessed VAS score, mm
72.34 ± 9.16
Investigator-assessed VAS score, mm
71.41 ± 7.21
44.88 ± 6.15
FSAT-KBD score (12–48)
27.69 ± 2.91
All total hip replacements were performed on the diseased hips by the same surgeons in laminar flow operating rooms. The patients received prophylactic antibiotics, namely, one dose (2.0 g) of intravenous cefazolin administered half an hour before the operation.
An appropriate implant was chosen via the preoperative use of templates, and a routine posterolateral approach was adopted. Vitalock cups were stabilized via a line-to-line reaming technique, and Duraloc cups were inserted via the press-fit technique.
All total hip replacements were performed using cementless implants. Small acetabular cups (cup size ≤ 46 mm) were placed in 13 hips after the deepening of the patient’s acetabulum. Six cups were reinforced using screws (4 hips with 2 screw and 2 hips with 3 screws). A morselized autogenous bone graft (resected from the femoral head) was used to fill cystic acetabular lesions and screw holes. Trochanteric osteotomies were used in the 3 hips in the high-dislocation group, and subtrochanteric osteotomies were used in the remaining 1 patient in the high-dislocation group.
Among the 22 patients, 10 patients with bilateral hip joint involvement underwent surgery for staged total hip replacements that were performed at an interval of approximately 7 days. Six patients with severe ipsilateral knee damage received total hip replacement first, followed by total knee replacement approximately 7 days later.
Postoperatively, one dose of prophylactic intravenous antibiotic (cefazolin, 2.0 g) was administered routinely. All the patients were administered an intramuscular injection of pethidine and/or oral NSAIDs to relieve post-surgery pain. All the patients received a nadroparin calcium injection to prevent venous thrombosis. Quadriceps, gluteal and hamstring setting exercises were started on the first postoperative day. The patients were encouraged to walk on the second postoperative day under the guidance of a physical therapist.
All the patients received follow-up clinical and radiographic assessments at 2 and 4 weeks and at 3, 6 and 12 months after surgery and annually thereafter. During each follow-up, all the radiographic and clinical efficacy measures were evaluated at the outpatient clinics. The patients reported the clinical efficacy assessments, whereas the surgeon analyzed the radiographic results.
The outcomes of the clinical measures included complications during the perioperative period and VAS, Harris score , Functional Score for Adult Tibetans with Kashin-Beck Disease (FSAT-KBD)  and radiographic outcomes at every follow-up. The FSAT-KBD scale is developed by orthopedic experts in our department for the specific lifestyles of Tibetans. It was verified as a reliable, validated tool for the evaluation of improvements in KBD symptoms and function in Tibetans .
Postoperative radiographs were reviewed for evidence of prosthetic loosening according to the criteria of DeLee et al. and De Ranieri et al. [29, 30]. Cup and stem loosening or migration was measured between consecutive images using software on our hospital computer (Syngo Imaging V31, Siemens AG Medical Solutions, Germany). Normally, acetabular components were considered to be loosened if they had tilted by more than 5° in the abduction angle, migrated 2 mm or more or presented with a continuous radiolucent line that was more than 2 mm in width. The cementless femoral components were defined as being loosed if serial radiographs showed a progressive axial subsidence greater than 5 mm or a progressive change in the position of the femoral component. Osteolysis was defined as a circular or oval area of distinct bone loss and was graded as mild (< 1 cm2), moderate (1–1.9 cm2), or severe (> 2 cm2) on anteroposterior radiographs of the hips.
Statistical analyses were undertaken by SPSS 16.0 software (SPSS Inc., Chicago, IL, USA). Continuous data are presented as a mean ± standard deviation (SD). Changes in VAS, Harris and FSAT-KBD scores were analyzed using a general linear model and repeated-measures ANOVA. Multiple comparisons vs. baseline were assessed according to Dunnett’s T3 method. Comparisons of the acetabular component angles between the postoperative results and the final endpoints were analyzed using apaired-samples t test. A p value less than 0.05 was considered significant, and a p value less than 0.01 was considered highly significant for all statistical tests.
The mean follow-up time of the 22 patients (32 hips) who completed follow-up was 3.8 years (range: 2–7 years). All patients were followed for at least 2 years in the outpatient department after their operation. Seventeen patients (25 hips) were followed successfully in the outpatient department until their final follow-up. Five patients (7 hips) were followed via telephone, while the x-ray films were delivered, because of bad traffic conditions in the local area (a plateau mountain area with frequent storms in winter and spring).
All the patients were required to walk postoperatively in an average of 2 days (range: 1–3 days). All the patients recovered uneventfully after surgery except for one 80-year old patient who developed a lung infection after the total hip replacement. This patient was treated with extended antibiotic therapy and encouraged to cough and breathe deeply. The lung infection was resolved within 1 week, and the patient successfully received a total knee replacement on the target knee. The patients received 5 days of postoperative care and were then discharged from the hospital in good health. No wound-healing disorders, wound infections or deep vein thromboses were recorded.
Clinical efficacy measures
At the first follow-up examination, the mean abduction angle of the acetabular component was 44.7° ±2.5° (range: 36.5–48.0°). At the last follow-up examination, the mean abductionangle of the acetabular components was 44.9° ± 2.4° (range: 37.1–48.3°). There was no significant difference in the abduction angle of the acetabular components (P =0.08). No gap was found at the interface between the bone and the acetabular components on the immediate postoperative radiograph (Fig. 4c). At the final follow-up, 2 sockets had radiolucent lines less than 2 mm in zone 1. Acetabular osteolysis was found in 12.5 % (4 hips) of the 32 hips (1 hip had severe osteolysis, 1 hip had moderate osteolysis, and 2 hips had mild osteolysis). The mean rate of polyethylene liner wear was 0.18 ± 0.14 mm/y (range: 0–0.24 mm/y).
After the operation, 25 femoral components were inserted in a neutral position, 4 in a mildly varus position, and 3 in a valgus position. At the latest follow-up examination, none of the femoral components were observed to have asignificant change in their position (Fig. 4c). Seven hips showed local osteolysis: in zone 1 in 2 hips and in zone 7 in 5 hips. The 3 hips with greater trochanteric osteotomies all acquired bony union.
One case experienced a severe hip osteolytic lesion (zone 1) complicated by femoral osteolysis (zone 7) 6 years postoperatively. The patient subsequently successfully received impacted allograft bone croutons in both the acetabular and femoral sides and had worn polyethylene components replaced in our department.
KBD is a disabling joint disease involving hyaline cartilage that typically leads to osteoarticular damage, deformity, pain and a severely limited range of activity in the advanced stages of the disease . Based on our experience in treating hip patients with OA, we evaluated the effect of total hip replacement in treating serious KBD in the hips of adult patients. We found that total hip replacement could significantly relieve pain and improve the function of the target hip and overall quality of life. These results were supported by the significantly decreased VAS scores and the significantly increased Harris and FSAT-KBD scores 6 months after replacement, suggesting that total hip replacement provides long-lasting efficacy and treatment of the hip pain and activity limitations resulting from KBD.
Total hip replacement is a successful surgical procedure that could improve joint function and relieve pain involving the late stages of hip OA in adult patients. Good long-term survival has been reported for cemented and cementless total hip replacement implants in studies in America [32, 33]. Studies have shown that most patients achieved good results, with some showing a 100 % survival rate . All the replacement procedures in our study were performed for the treatment of serious KBD hip with K-L grade IV. All the patients obtained good clinical results within 2 years postoperatively, and no change in the prosthesis positioning or radiographic evidence of prosthesis loosening was found at the last follow-up (range: 2–7 years), which is similar to the results of the aforementioned reports [22, 32, 33]. Only one case experienced a severe pelvic osteolytic lesion (zone 1) complicated with femoral osteolysis (zone 7) at 6 years postoperatively. This patient successfully received impacted allograft bone croutons and had worn polyethylene components replaced.
Few studies have reported clinical results on total hip replacement treatment in late-stage knee with KBD cases. Yang et al. reported nine cases of hip with KBD that included treatment with total hip replacement. Among these patients, 66.7 % of the patients (four cases) had good results, and one patient had fair (60–70 points) results based on the Harris scores . More recently, Qian GB et al. reported on 13 cases (20 hips) of patients with KBD that underwent total hip replacement . The 13 cases were divided into two groups based on the use of cemented or cementless components and were followed for 8–48 months. The outcomes showed that all the hips in both groups had good clinical outcomes according to their Harris scores. No radiographic evidence of prosthesis loosening, sinkage or change in prosthesis positioning at the end of the follow-up was reported. The final averaged Harris score was approximately 93.0 in these patients, which was similar to the final scores observed in our study.
KBD typically results in symmetrical and multi-joint damage in adult patients. Therefore, the function scales frequently used to evaluate global limb function might not be appropriate for evaluating the limb function of the KBD patients in our study because most items in these existing scoring systems, which have mostly been designed by Westerners, could be misunderstood and are confusing to Chinese KBD patients living in Aba Prefecture, Sichuan province, China. First, Aba Prefecture, where the patients worked, is a very poor mountainous region in China with harsh living conditions on the Tibetan plateau, known as the roof of the world, where life predominantly depends on agriculture and farming . Second, most of the inhabitants in this epidemic area are Tibetan residents and follow Tibetan Buddhism, so they have a unique lifestyle and work habits that are significantly different from Western and urban residents. For example, the items in the scales designed by Westerners concerning whether one can use a knife and fork at the dinner table or whether one can sit on a chair may not be appropriate in this case because most KBD patients in this area use their right hand to manipulate food rather than using a knife and fork with both hands, and they primarily sit on the ground in a cross-legged position instead of sitting on chairs. The FSAT-KBD scale has been verified as a validated and reliable instrument to assess changes in KBD clinical symptoms and functional disability in Tibetans . Our study showed the FSAT-KBD scores improved rapidly 3–6 months after hip replacement, suggesting that total hip replacement treatment could rapidly improve global joint function. The slight reduction in the FSAT-KBD scores after 2 years, relative to the 6-month scores, could be attributed to the worsening conditions of other limbs with the passage of the time [14, 27].
Some of the differences between KBD and OA are that OA usually occurs in elderly people with articular cartilage degeneration that is observable via radiology, it seldom affects multiple joints symmetrically and does not present with shortened fingers and phocomelic limbs. In contrast, KBD onset often occurs during childhood and adolescence, symmetrically affects multiple joints and mainly results in damage to the epiphysis, resulting in developmental disabilities that are observable via radiology . Therefore, the overall functional results of KBD patients in the advanced stage are often worse than those of OA patients because systemic dysfunction may be aggravated by other large joints involved. KBD patients who undergo hip replacement often display the same trend of systemic functional results as time passes, which was confirmed in the present study by a slight decrease in the FSAT-KBD scores, relative to the 6 month scores, 2 years after undergoing total hip replacement.
The small number of patients included and the open-label design could be considered limitations of this study, which precludes any definitive conclusions regarding the effectiveness of total hip replacement treatment in KBD hip cases. We recommend additional randomized, long-term and prospective studies with more patients to confirm the findings in this study.
Based on the results of our study, total hip replacement could be efficacious in treating serious KBD hips with promising clinical and radiographic outcomes at the intermediate follow-up period. Additional studies that are of higher quality are needed to confirm the findings in our study.
FSAT-KBD, Functional Score for Adult Tibetans with Kashin-Beck Disease, KBD, Kashin-Beck disease; K-L, Kellgren-Lawrence; NSAIDs, non-steroidal anti-inflammatory drugs; OA, osteoarthritis; SD, standard deviation; VAS, avisual analogue scale
The authors would like to thank the local government (Aba Prefecture) for their help and cooperation with the clinical data collection.
This research was funded by China National Science & Technology Pillar Program during the eleventh 5-year plan period (2007BAI 25B04) in the design of the study and collection, and supported by Science Plan of Sichuan Province (2014SZ0023-1) and National Natural Science Foundation of China (81101388) in interpretation of data and in writing the manuscript.
Availability of data and materials
The data supporting the conclusions of this article are included within the article/table.
TX and ZJ carried out all of the follow-ups of the study and prepared the manuscript. TX and ZJ equally contributed to the writing of the paper. SB and KP participated in designing the study and were responsible for the analysis and interpretation of the data. LJ initiated the study, provided suggestions for the study and critically reviewed the manuscript. ZZ and PF secured funding and were responsible for the study set-up. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
This study was approved by the Human and Ethics Committee for Medical Research at Sichuan University in accordance with the Declaration of Helsinki. Written informed consent was obtained for all patients prior to their inclusion in the study.
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