Department of Orthopedic Surgery, Mayo Clinic, Phoenix, Arizona 85054, USA.
J Arthroplasty. 2012 Jun;27(6):1155-8. doi: 10.1016/j.arth.2011.12.026. Epub 2012 Feb 15.
Restoration of femoral posterior condylar offset (PCO) may contribute to maximum flexion after total knee arthroplasty. Accurate radiographic measurement of postoperative PCO is possible, as the prosthesis margins can be easily identified; however, preoperative measurement of PCO may be inaccurate, as the remaining cartilage thickness of the posterior condyles is not included. This error may contribute to the controversy surrounding the importance of PCO. In this institutional review board-approved study, the cartilage thickness of posterior condylar specimens resected during total knee arthroplasty was measured. Mean cartilage thicknesses of the posterior condyles were 1.7 mm (range, 0-4 mm) medially and 2.0 mm (range, 0-5 mm) laterally. As the cartilage thickness is variable, future studies of PCO must adjust the preoperative radiographic measurements by the cartilage thickness measured intraoperatively.
恢复股骨髁后髁偏心距（PCO）可能有助于全膝关节置换术后的最大屈曲度。术后 PCO 的准确放射影像学测量是可行的，因为可以轻松识别假体边缘；然而，术前 PCO 的测量可能不准确，因为不包括后髁的剩余软骨厚度。这一误差可能导致了 PCO 重要性的争议。在这项经机构审查委员会批准的研究中，测量了在全膝关节置换术中切除的后髁标本的软骨厚度。后髁的平均软骨厚度为内侧 1.7 毫米（范围，0-4 毫米），外侧 2.0 毫米（范围，0-5 毫米）。由于软骨厚度存在差异，未来关于 PCO 的研究必须通过术中测量的软骨厚度来调整术前放射影像学测量值。
