Wang Wei, Tsai Tsung-Yuan, Yue Bin, Kwon Young-Min, Li Guoan
Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA; Department of Orthopaedic Surgery, Second Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China.
Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
Knee. 2014 Mar;21(2):553-6. doi: 10.1016/j.knee.2013.03.010. Epub 2013 Apr 12.
The effect of posterior condylar offset (PCO) on maximal flexion of the knee after TKA is controversial. Another parameter, the posterior condylar offset ratio (PCOR), has been recently introduced to describe the posterior condylar geometry. This study measured the posterior femoral condyle geometry of a Chinese population and compared with those of a Western population published in the literature.
We measured the PCO and PCOR of 100 Chinese knees (50 males, 50 females). The distances from the anterior and posterior femoral shaft cortex line to the most posterior femoral condyle tangent line were defined as the anterior-posterior dimension (ACP) and posterior condylar offset (PCO). The PCOR was calculated as PCO/ACP. The measured PCO and PCOR were compared to those of a Western population reported in the literature.
The PCOs were 25.80±2.71 and 27.32±2.34 mm for the Chinese females and males, respectively, where the PCO of the females was significantly smaller than that of the males (p<0.05). The PCORs were 0.47±0.04 and 0.46±0.03 for the Chinese females and males, respectively, where the PCORs were similar among the Chinese males and females (p>0.05).
While the PCO of the Chinese females was smaller than that of the males, their PCORs were similar. Compared to the data of a Western population reported in literature, the PCO of the Chinese population is significantly smaller, but the PCOR is significantly larger.
髁后偏移（PCO）对全膝关节置换术（TKA）后膝关节最大屈曲度的影响存在争议。最近引入了另一个参数，即髁后偏移率（PCOR）来描述髁后几何形状。本研究测量了中国人群的股骨后髁几何形状，并与文献中报道的西方人群的进行比较。
我们测量了100例中国患者膝关节（50例男性，50例女性）的PCO和PCOR。股骨骨干前后皮质线到股骨后髁最切线的距离定义为前后径（ACP）和髁后偏移（PCO）。PCOR计算为PCO/ACP。将测量得到的PCO和PCOR与文献中报道的西方人群的进行比较。
中国女性和男性的PCO分别为25.80±2.71和27.32±2.34mm，其中女性的PCO显著小于男性（p<0.05）。中国女性和男性的PCOR分别为0.47±0.04和0.46±0.03，中国男性和女性的PCOR相似（p>0.05）。
中国女性的PCO小于男性，但她们的PCOR相似。与文献中报道的西方人群数据相比，中国人群的PCO显著更小，但PCOR显著更大。
