Abstract
Purpose
A varus deformity (VD) of the lower limbs results in greater loading of the medial compartment of the knee joint (KJ), leading to its degenerative changes and, eventually, to progressive osteoarthritis (OA) of the joint. The aim of the study was to investigate the mid-term changes in gait biomechanics and clinical symptoms in patients with VD of KJ and OA before and six months after surgical correction.
Methods
The study enrolled 25 patients with medial OA of grade 2–3 according to Kellgren-Lawrence and a VD of > 3°, who underwent arthroscopic lavage and debridement of the knee joint followed by corrective osteotomy. The control group included 20 healthy adults. Clinical and biomechanical assessments were done twice: immediately prior to and six months after the surgical treatment. Biomechanical parameters of gait were recorded using an inertial sensor system.
Results
According to our findings, there was a statistically significant post-operative increase in the knee extension amplitude by 1.4° in female patients and an insignificant extension increase in male patients.
The mean postoperative KOOS score was 66.7 points (46 to 91) in the patient group, 67.1 points (54 to 91) in males, and 59.5 points (46 to 64) in females. As early as six months after a valgus osteotomy, we already observed improved biomechanics of the KJ motions compared to pre-operative data. By that time, the swing flexion amplitude of the affected KJ had increased and became symmetrical, which had not been the case before surgery. We observed a total of three changes in the KJ kinematics after surgery: increased swing flexion amplitudes in both KJs, a decreased extension amplitude in the affected KJ, and increased first flexion amplitudes in both KJs.
Conclusion
According to our study, the midterm outcomes after a valgus osteotomy showed clinical improvements based on the VAS and KOOS scores, which were however less pronounced than in similar studies with a longer assessment term after surgery. We also found a significant increase in the amplitude of joint extension, but only in females. As the function of the operated joint is concerned, valgus osteotomy restored the kinematics of walking movements to a nearly normal gait with increased first and second flexion amplitudes. The function of KJ becomes symmetric though the non-operative side. Thus, the healthy and functionally more capable side is copying the movement pattern of the affected side. Hence, the non-operative leg is functioning less efficiently than it is required by the walking pace.
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Data availability
All primary data are with the authors of this study.
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DS: conceptualization, methodology, writing draft, editing; SK: data curation, investigation, writing draft; AP: data curation, writing draft, editing; AA: data curation, formal analysis, writing draft; EG: writing draft, formal analysis; AN: investigation, formal analysis. All authors have read and agreed to the published version of the manuscript.
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The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the local ethical committee (Buyanov V.M. Moscow City Clinical Hospital), Minutes No. 06–07.04.17 from 07.04.2017.
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Skvortsov, D., Kaurkin, S., Prizov, A. et al. Gait analysis and knee joint kinematics before a and 6 month after of corrective valgus osteotomy at patients with medial knee arthritis. International Orthopaedics (SICOT) 46, 1573–1582 (2022). https://doi.org/10.1007/s00264-022-05370-9
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DOI: https://doi.org/10.1007/s00264-022-05370-9