Imai Norio, Miyasaka Dai, Tsuchiya Kazuki, Suzuki Hayato, Ito Tomoyuki, Minato Izumi, Endo Naoto
Division of Comprehensive Geriatrics in Community, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
J Orthop Sci. 2018 Sep;23(5):788-792. doi: 10.1016/j.jos.2018.05.004. Epub 2018 Jun 19.
The purpose of this study is to measure pelvic morphology with respect to the pelvic incidence, pelvic tilt, and sacral slope using 3-dimensional measurement and to compare the pelvic morphology between the normal population and women with developmental dysplasia of the hip (center-edge angle, <25°). We hypothesized that the relationship between pelvic incidence, anatomical pelvic tilt, and anatomical sacral slope would be different between normal subjects and patients with developmental dysplasia of the hip.
We evaluated 61 healthy women without low back or knee pain and 71 patients with developmental dysplasia of the hip. We used the 3-dimensional pelvis model adjusted to the anterior pelvic plane and measured the pelvic parameters. To determine correlation, we used Pearson's coefficients. To evaluate variation, we used intraclass correlation coefficients.
Pelvic incidence and anatomical pelvic tilt were significantly greater by 4° in the group with developmental dysplasia of the hip than in the normal group (p = 0.026 and < 0.001, respectively). The vertical distance from hip axis to the center of the S1 endplate was significantly greater in the group with developmental dysplasia of the hip than in normal group, that is, by 8 mm (p < 0.001). There was a strong correlation between pelvic incidence and anatomical sacral slope in both groups (R = 0.707 and 0.897, respectively). The intraobserver and interobserver mean absolute differences were about 2 mm and 2°, respectively, and the intraclass correlation coefficient was >0.88.
Pelvic incidence and anatomical-pelvic tilt were significantly greater in patients with developmental dysplasia of the hip. We found a strong correlation between the pelvic incidence and anatomical sacral slope in both groups. Therefore, anatomical-sacral slope may be useful for estimating pelvic incidence because it is not easily measured, especially in patients with osteoarthritis of the hip joint.
本研究旨在通过三维测量来评估骨盆形态的骨盆倾斜度、骨盆倾斜角和骶骨倾斜度，并比较正常人群和发育性髋关节发育不良（中心边缘角<25°）女性之间的骨盆形态。我们假设正常受试者与发育性髋关节发育不良患者之间骨盆倾斜度、解剖学骨盆倾斜度和解剖学骶骨倾斜度之间的关系会有所不同。
我们评估了61名无腰背痛或膝关节疼痛的健康女性和71名发育性髋关节发育不良患者。我们使用了根据骨盆前平面调整的三维骨盆模型，并测量了骨盆参数。为了确定相关性，我们使用了皮尔逊系数。为了评估变异性，我们使用了组内相关系数。
发育性髋关节发育不良组的骨盆倾斜度和解剖学骨盆倾斜度比正常组显著大4°（分别为p = 0.026和<0.001）。发育性髋关节发育不良组从髋关节轴到S1终板中心的垂直距离比正常组显著大8mm（p < 0.001）。两组中骨盆倾斜度与解剖学骶骨倾斜度之间均存在强相关性（分别为R = 0.707和0.897）。观察者内和观察者间的平均绝对差异分别约为2mm和2°，组内相关系数>0.88。
发育性髋关节发育不良患者的骨盆倾斜度和解剖学骨盆倾斜度显著更大。我们发现两组中骨盆倾斜度与解剖学骶骨倾斜度之间均存在强相关性。因此，解剖学骶骨倾斜度可能有助于估计骨盆倾斜度，因为它不易测量，尤其是在髋关节骨关节炎患者中。
