Dandachli Wael, Ul Islam Saif, Richards Robin, Hall-Craggs Margaret, Witt Johan
Department of Orthopaedic Surgery, Imperial College London Hospitals, London, UK.
Hip Int. 2013 Jan-Feb;23(1):87-92. doi: 10.5301/HIP.2013.10715.
The orientation of the pelvis influences that of the acetabulum. In particular, pelvic tilt in the sagittal plane may lead to inaccurate interpretation of plain pelvic radiographs. We therefore quantified the relationship between this pelvic tilt and acetabular orientation in native hips, and determined whether pelvic tilt affects femoral head cover. We analysed computed tomography scans of 93 hips (36 normal, 31 dysplastic, 26 with acetabular retroversion) and measured acetabular anteversion, inclination, and femoral head cover at pelvic tilt angles ranging from -20° to 20° in relation to the anterior pelvic plane using 5° increments. Pelvic tilt changed acetabular version with a decrease in anteversion ranging from 2.5° to 5° for every 5° of forward tilt. The effect on inclination was less marked and varied. In normal and dysplastic hips pelvic tilt increased apparent femoral head cover. A greater understanding of the influence of pelvic tilt may allow improvements in the radiological diagnosis and surgical treatment of acetabular abnormalities, particularly in relation to acetabular reorientation procedures and femoroacetabular impingement.
骨盆的方向会影响髋臼的方向。特别是，矢状面的骨盆倾斜可能会导致对骨盆平片的解读不准确。因此，我们量化了正常髋关节中这种骨盆倾斜与髋臼方向之间的关系，并确定骨盆倾斜是否会影响股骨头覆盖情况。我们分析了93例髋关节的计算机断层扫描（36例正常，31例发育不良，26例髋臼后倾），并在相对于骨盆前平面的骨盆倾斜角度从-20°到20°（以5°为增量）的范围内测量了髋臼前倾角、倾斜度和股骨头覆盖情况。骨盆倾斜会改变髋臼的版本，每向前倾斜5°，前倾角会减少2.5°至5°。对倾斜度的影响不太明显且有所不同。在正常和发育不良的髋关节中，骨盆倾斜会增加表观股骨头覆盖。对骨盆倾斜影响的更深入理解可能有助于改善髋臼异常的放射学诊断和手术治疗，特别是在髋臼重新定向手术和股骨髋臼撞击方面。
