Orthopaedics and Traumatology, Queen Mary Hospital, Hong Kong, China.
Int Orthop. 2011 Mar;35(3):325-9. doi: 10.1007/s00264-010-0977-9. Epub 2010 Feb 24.
The size of the femoral head and acetabular anteversion are crucial for stability in total hip replacements. This study examined the effects of head diameter and acetabular anteversion on the posterior instability after total hip replacement in an in vivo setting. The acetabular shell was inserted at 0-20° of anteversion at five degree intervals. By using different head sizes (28 mm, 32 mm, 36 mm), the degrees of dislocation were recorded by computer navigation. The 36-mm group consistently showed better stability compared with the 32- and 28-mm groups, regardless of the degree of cup anteversion. Within each group of head size, the hip was significantly more stable when the cup anteversion increased from 0° to 10°. The difference became insignificant when it increased from 15° to 20°.
股骨头和髋臼前倾角的大小对于全髋关节置换的稳定性至关重要。本研究在体内环境下研究了股骨头直径和髋臼前倾角对全髋关节置换后后向不稳定的影响。髋臼壳以 0-20°的前倾角每隔 5°插入。通过使用不同的股骨头尺寸（28mm、32mm、36mm），计算机导航记录脱位程度。无论杯前倾角如何，36mm 组始终显示出比 32mm 和 28mm 组更好的稳定性。在每个股骨头尺寸组中，当杯前倾角从 0°增加到 10°时，髋关节明显更稳定。当它从 15°增加到 20°时，差异变得不显著。
