Tannast M, Murphy S B, Langlotz F, Anderson S E, Siebenrock K A
Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, Switzerland.
Skeletal Radiol. 2006 Mar;35(3):149-55. doi: 10.1007/s00256-005-0050-8. Epub 2005 Dec 20.
To compare six different parameters described in literature for estimation of pelvic tilt on an anteroposterior pelvic radiograph and to create a simple nomogram for tilt correction of prosthetic cup version in total hip arthroplasty.
Simultaneous anteroposterior and lateral pelvic radiographs are taken routinely in our institution and were analyzed prospectively. The different parameters (including three distances and three ratios) were measured and compared to the actual pelvic tilt on the lateral radiograph using simple linear regression analysis.
One hundred and four consecutive patients (41 men, 63 women with a mean age of 31.7 years, SD 9.2 years, range 15.7-59.1 years) were studied.
The strongest correlation between pelvic tilt and one of the six parameters for both men and women was the distance between the upper border of the symphysis and the sacrococcygeal joint. The correlation coefficient was 0.68 for men (P<0.001) and 0.61 for women (P<0.001). Based on this linear correlation, a nomogram was created that enables fast, tilt-corrected cup version measurements in clinical routine use.
This simple method for correcting variations in pelvic tilt on plain radiographs can potentially improve the radiologist's ability to diagnose and interpret malformations of the acetabulum (particularly acetabular retroversion and excessive acetabular overcoverage) and post-operative orientation of the prosthetic acetabulum.
比较文献中描述的用于在骨盆前后位X线片上估计骨盆倾斜度的六个不同参数，并创建一个简单的列线图用于全髋关节置换术中假体髋臼杯外展角的倾斜度校正。
在我们机构常规同时拍摄骨盆前后位和侧位X线片，并进行前瞻性分析。测量不同参数（包括三个距离和三个比率），并使用简单线性回归分析将其与侧位X线片上的实际骨盆倾斜度进行比较。
研究了104例连续患者（41例男性，63例女性，平均年龄31.7岁，标准差9.2岁，范围15.7 - 59.1岁）。
男性和女性的骨盆倾斜度与六个参数之一之间最强的相关性是耻骨联合上缘与骶尾关节之间的距离。男性的相关系数为0.68（P<0.001），女性为0.61（P<0.001）。基于这种线性相关性，创建了一个列线图，可在临床常规使用中实现快速、经倾斜度校正的髋臼杯外展角测量。
这种校正平片上骨盆倾斜度变化的简单方法可能会提高放射科医生诊断和解释髋臼畸形（特别是髋臼后倾和髋臼过度覆盖）以及假体髋臼术后方向的能力。
