Ahuja Kedar, Shaikh Ashraf, Lalwani Devansh, Desai Mohan M
Department of Orthopaedics, Shivneri Hospital, Ulhasnagar, IND.
Department of Orthopaedics, King Edward Memorial (KEM) Hospital and Seth Gordhandas Sunderdas Medical College (GSMC), Mumbai, IND.
Cureus. 2024 Sep 29;16(9):e70454. doi: 10.7759/cureus.70454. eCollection 2024 Sep.
Purpose The objective of this study was to evaluate the compatibility of the medial femoral condyle (MFC) dimensions in the Indian population with the standard femoral components of three commercially available unicompartmental knee arthroplasty (UKA) implants. Methods This analytical study utilized CT morphometric data from 100 consecutive non-arthritic adult knees. MFC dimensions were measured to assess their compatibility with UKA prostheses. The proportion of knees that could be optimally replaced using three commercially available UKA femoral implant systems, Link, DePuy, and Smith & Nephew, was calculated. Results The study cohort comprised 56 males and 44 females, with a mean age of 43.28 ± 10.53 years. For the Link implant system, the 'small' size was the most compatible, fitting 43% (43) of the patients, followed by 'medium-small' (35%, n = 35) and 'medium' (16%, n = 16). For the DePuy Sigma Uni implant, the best fit was 'size 1' for 38% (38) of the patients, followed by 'size 3' (25%, n = 25), 'size 4' (13%, n = 13), 'size 2' (10%, n = 10), and 'size 5' (2%, n = 2). In the case of the Smith & Nephew system, 'size 2' was the best fit for 30% (30) of the knees, followed by 'size 3' (27%, n = 27), 'size 4' (15%, n = 15), 'size 1' (12%, n = 12), and 'size 5' (8%, n = 8). Overhang of the femoral component, due to the MFC being smaller than the smallest available femoral component size, was observed in 6% (6) of knees with Link implants, 12% (12) with DePuy implants, and 8% (8) with Smith & Nephew implants. Conclusion The findings indicate that the most suitable femoral component sizes for Indian knees were 'small' in the Link system (43%, n = 43), 'size 1' in the DePuy system (38%, n = 38), and 'size 2' in the Smith & Nephew system (30%, n = 30). The results suggest a need for implant manufacturers to consider developing customized components tailored to the Indian population to enhance fit and minimize the occurrence of femoral component overhang.
目的 本研究的目的是评估印度人群中股骨内侧髁（MFC）尺寸与三种市售单髁膝关节置换术（UKA）植入物的标准股骨组件的兼容性。方法 这项分析研究利用了100例连续的非关节炎成年膝关节的CT形态测量数据。测量MFC尺寸以评估其与UKA假体的兼容性。计算了使用三种市售UKA股骨植入系统（Link、DePuy和史赛克）能够得到最佳置换的膝关节比例。结果 研究队列包括56名男性和44名女性，平均年龄为43.28±10.53岁。对于Link植入系统，“小号”尺寸兼容性最佳，适合43%（43例）患者，其次是“中小号”（35%，n = 35）和“中号”（16%，n = 16）。对于DePuy Sigma Uni植入物，最适配的是“1号尺寸”，适用于38%（38例）患者，其次是“3号尺寸”（25%，n = 25）、“4号尺寸”（13%，n = 13）、“2号尺寸”（10%，n = 10）和“5号尺寸”（2%，n = 2）。在史赛克系统中，“2号尺寸”最适合30%（30例）膝关节，其次是“3号尺寸”（27%，n = 27）、“4号尺寸”（15%，n = 15）、“1号尺寸”（12%，n = 12）和“5号尺寸”（8%，n = 8）。在使用Link植入物的膝关节中，6%（6例）观察到由于MFC小于最小可用股骨组件尺寸导致的股骨组件悬垂；使用DePuy植入物的为12%（12例），使用史赛克植入物的为8%（8例）。结论 研究结果表明，对于印度膝关节，Link系统中最合适的股骨组件尺寸是“小号”（43%，n = 43），DePuy系统中是“1号尺寸”（38%，n = 38），史赛克系统中是“2号尺寸”（30%，n = 30）。结果表明植入物制造商需要考虑开发针对印度人群定制的组件，以提高适配性并减少股骨组件悬垂的发生。
