Nivbrant Nils Oscar, Yates Piers J
Fremantle Hospital, Orthopaedics Research Foundation of WA Alma St, 6160, Fremantle, WA, Australia.
J Orthop. 2024 Nov 26;65:20-23. doi: 10.1016/j.jor.2024.11.021. eCollection 2025 Jul.
Micromotion analysis predicts component fixation survival in Total Knee Arthroplasty (TKA) but a paucity of literature exists for medial pivot designs. This clinical study examined the tibial component micromotion in a second-generation medial pivot TKA.
This prospective single-center clinical cohort trial involved 35 patients with a mean patient age of 71 years. Operations were performed by one experienced arthroplasty surgeon using the Saiph implant (MatOrtho). All patients received fully cemented fixation with patella resurfacing. Other variables were standardized. Radiostereometric Analysis was performed at 6 weeks, 12 and 24 months to monitor tibial component behavior.
Benign, minor micromotion was shown with cemented fixation. At 12 months median subsidence was 0.04 mm and Median Maximal Total Point Motion was 0.44 mm. At 24 months the median subsidence was 0.02 mm and Median Maximal Total Point Motion was 0.46 mm. No tibial components were revised.
Low degrees of subsidence and Maximum Total Point Motion imply stable fixation of these medial pivot implants and high patient satisfaction was achieved. This is consistent with favorable long-term performance.
微动分析可预测全膝关节置换术（TKA）中假体固定的存活情况，但关于内侧旋转平台设计的文献较少。本临床研究检测了第二代内侧旋转平台TKA中胫骨假体的微动情况。
这项前瞻性单中心临床队列试验纳入了35例患者，平均年龄71岁。手术由一位经验丰富的关节置换外科医生使用Saiph假体（MatOrtho）进行。所有患者均采用骨水泥全固定并进行髌骨表面置换。其他变量均标准化。在术后6周、12个月和24个月进行放射立体测量分析，以监测胫骨假体的情况。
骨水泥固定显示出良性的微小运动。在12个月时，平均下沉量为0.04mm，最大总点数运动（MTPM）中位数为0.44mm。在24个月时，平均下沉量为0.02mm，MTPM中位数为0.46mm。没有胫骨假体需要翻修。
低程度的下沉和最大总点数运动意味着这些内侧旋转平台假体固定稳定，患者满意度高。这与良好的长期性能一致。
