Division of orthopaedic surgery, Department of orthopaedics, Nanfang Hospital, Southern Medical University, 1838 Guangzhou Avenue, Guangzhou, 510515, Guangdong, China.
BMC Musculoskelet Disord. 2021 May 27;22(1):486. doi: 10.1186/s12891-021-04367-6.
Femoral posterior condylar offset (PCO) and posterior tibial slope (PTS) are important for postoperative range of motion after total knee arthroplasty (TKA). However, normative data of PCO and PTS and the correlation between them among healthy populations remain to be elucidated. The purpose of this study was to determine PCO and PTS in normal knees, and to identify the correlation between them.
Eighty healthy volunteers were recruited. CT scans were performed followed by three-dimensional reconstruction. PCO and PTS were measured and analyzed, as well as the correlation between them.
PTS averaged 6.78° and 6.11°, on the medial and lateral side respectively (P = 0.002). Medial PCO was greater than lateral (29.2 vs. 23.8 mm, P < 0.001). Both medial and lateral PCO of male were larger than female. On the contrary, male medial PTS was smaller than female, while there was no significant difference of lateral PTS between genders. There was an inverse correlation between medial PCO and PTS, but not lateral.
Significant differences exhibited between medial and lateral compartments, genders, and among individuals. An inverse correlation exists between PCO and PTS in the medial compartment. These results improve our understanding of the morphology and biomechanics of normal knees, and subsequently for optimising prosthetic design and surgical techniques.
股骨髁后髁偏心距（PCO）和胫骨后倾角（PTS）对于全膝关节置换术后的活动范围非常重要。然而，健康人群的 PCO 和 PTS 的正常值数据及其之间的相关性仍有待阐明。本研究的目的是确定正常膝关节的 PCO 和 PTS，并确定它们之间的相关性。
招募了 80 名健康志愿者。进行 CT 扫描并进行三维重建。测量和分析了 PCO 和 PTS 及其之间的相关性。
PTS 平均值分别为内侧 6.78°和外侧 6.11°（P = 0.002）。内侧 PCO 大于外侧（29.2 与 23.8 mm，P < 0.001）。男性的内外侧 PCO 均大于女性。相反，男性内侧 PTS 小于女性，而外侧 PTS 无明显性别差异。内侧 PCO 与 PTS 呈负相关，但外侧无相关性。
内侧和外侧间、性别间以及个体间存在显著差异。内侧间 PCO 和 PTS 之间存在负相关。这些结果提高了我们对正常膝关节形态和生物力学的理解，从而优化了假体设计和手术技术。
