Sarzaeem Mohammad Mahdi, Sayyadi Shahram, Pourmojarab Ali, Omidian Mohammad Mahdi, Bagherian Lemraski Mohammad Mahdi, Baroutkoub Mojtaba, Salimi Sohrab, Rasi Alireza Manafi
Department of Orthopedic Surgery and Traumatology, Imam Hossein Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Department of Anesthesiology, Imam Hossein Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Adv Biomed Res. 2022 Apr 29;11:34. doi: 10.4103/abr.abr_165_21. eCollection 2022.
Severe varus deformity of the knee poses a technical challenge in balancing the flexion-extension gaps. The use of a varus-valgus constrained prosthesis is a solution to achieve coronal plane stability. The results of constrained condylar knee (CCK) implants in primary total knee arthroplasty are not well known. This study aims to compare the functional outcomes of posterior-stabilized (PS) and CCK implants for primary arthroplasty of the varus knee.
Twenty patients with bilateral severe osteoarthritis and genu varum of more than 10° were enrolled in this study. One knee was randomly implanted with a fixed-bearing PS implant, whereas the other was implanted with a CCK prosthesis. Pre- and postoperative Knee Society Score (KSS) and Oxford Knee Score (OKS) questionnaires were completed, and knee flexion was measured and compared.
The patients were followed for 32 months on average (24-36 months). On the KSS and OKS, both the groups improved significantly, but the difference between them was not statistically significant. Postoperative knee flexion was also not different between the two groups. Furthermore, 18 patients could not distinguish the difference between the two prostheses, whereas two patients preferred the PS one.
We demonstrated that a PS prosthesis can achieve comparable functional results to the CCK one in the short term.
膝关节严重内翻畸形在平衡屈伸间隙方面带来技术挑战。使用内外翻受限假体是实现冠状面稳定的一种解决方案。在初次全膝关节置换术中使用受限髁膝关节（CCK）假体的结果尚不清楚。本研究旨在比较后稳定型（PS）和CCK假体用于内翻膝关节初次置换术的功能结果。
本研究纳入20例双侧严重骨关节炎且膝内翻超过10°的患者。一侧膝关节随机植入固定平台PS假体，另一侧植入CCK假体。术前和术后完成膝关节协会评分（KSS）和牛津膝关节评分（OKS）问卷，并测量和比较膝关节屈曲度。
患者平均随访32个月（24 - 36个月）。在KSS和OKS评分上，两组均有显著改善，但两组之间的差异无统计学意义。两组术后膝关节屈曲度也无差异。此外，18例患者无法区分两种假体之间的差异，而2例患者更喜欢PS假体。
我们证明，在短期内，PS假体可取得与CCK假体相当的功能结果。
