Shah Darshil, Naik Lokesh Gudda, Pawar Prashant, Shah Pathik, Bagaria Vaibhav
Sir HN Reliance Foundation Hospital, Mumbai, Maharashtra, 400004, India.
J Orthop. 2021 Jul 9;26:29-35. doi: 10.1016/j.jor.2021.07.003. eCollection 2021 Jul-Aug.
Roof arc angle (RAA) is determined by measuring angle between a vertical line drawn from center of the acetabulum towards the acetabular dome and a second line drawn from center of acetabulum to the fracture through the acetabulum. Joel and Matta demonstrated that when roof arc angle was less than 45° on Pelvic AP and Judet's views, the fracture line is considered to be passing through the weight-bearing dome and require surgical fixation. The main purpose of the study is to calculate patient-specific angle and width for the better evaluation and management of acetabular fractures.
Radiographs of normal hips were retrieved from electronic data and parameters were calculated. Two observers calculated the parameters at two different intervals. Pearson correlation formula was used to find a correlation between groups.
Fifty radiographs of 28 patients were reviewed. The mean age of patients was 75.58 years ±13.28. The radius of the acetabulum, the radiographic measurement of sector width for 45° angulation at the roof, and the mathematical calculation for roof arc for 45° angle had significant positive correlation for both observers at two different occasions.
The measured roof arc width ranges from a minimum of 16.20 mm-31.50 mm and the calculated arc width for a 45-degree angle varies from a minimum of 15 mm-25.56 mm. These values are higher than the described values of 10 mm equals to 45 degrees. Hence, the values measured in this study should be considered for decision making in the management of acetabular fractures.
髋臼顶弧角（RAA）通过测量从髋臼中心向髋臼顶绘制的垂直线与从髋臼中心穿过髋臼至骨折处绘制的第二条线之间的角度来确定。乔尔和马塔证明，在骨盆前后位（AP）和朱代位片上，当顶弧角小于45°时，骨折线被认为穿过负重顶，需要手术固定。本研究的主要目的是计算患者特异性角度和宽度，以更好地评估和处理髋臼骨折。
从电子数据中获取正常髋关节的X线片并计算参数。两名观察者在两个不同时间段计算参数。使用皮尔逊相关公式来寻找组间的相关性。
对28例患者的50张X线片进行了回顾。患者的平均年龄为75.58岁±13.28。髋臼半径、髋臼顶45°角扇形宽度的影像学测量值以及45°角顶弧的数学计算值，在两名观察者的两次不同观察中均具有显著正相关性。
测量的顶弧宽度范围为最小值16.20毫米至31.50毫米，45度角的计算弧宽度范围为最小值15毫米至25.56毫米。这些值高于所描述的10毫米等于45度的值。因此，在髋臼骨折的处理决策中应考虑本研究中测量的值。
