Department of Orthopaedic Surgery, Kyung Hee University Hospital, 23 Kyungheedae-ro, Dongdaemun-ku, Seoul, 02447, Republic of Korea.
Department of Orthopaedic Surgery, Kyung Hee University Hospital at Gangdong, 892 Dongnam-ro, Gangdong-ku, Seoul, 05278, Republic of Korea.
Knee Surg Sports Traumatol Arthrosc. 2019 Oct;27(10):3125-3132. doi: 10.1007/s00167-018-4980-9. Epub 2018 Jun 6.
This study was performed to evaluate the effects of age on the alpha angle and the incidence of asymptomatic cam morphology.
The radiographs of asymptomatic individuals between ages 8 and 22 were retrospectively collected. A total of 1417 individuals were included and grouped according to age: 8-12 (Group A), 13-18 (Group B), and 19-22 (Group C) years. Radiographic measurements of the alpha angles of the right hip were obtained from anteroposterior (AP) and frog-leg lateral (FL) radiographs. The correlations among alpha angles, the presence of cam morphology, and age were determined.
The mean alpha angles of the three groups were statistically different (p < 0.001, each). The alpha angles on both radiographs were positively correlated with age. Intra-group analysis revealed that this correlation was only evident on the FL images of males in Group B. The presence of a radiographic cam morphology also positively correlated with age (p < 0.001 in both AP and FL images). The cam morphology on AP radiographs was 0 in Group A, 17(3.0%) in Group B, and 21(4.8%) in Group C; that on FL radiographs was 2(0.3%) in Group A, 45(7.9%) in Group B, and 103(23.6%) in Group C. Intra-group analysis revealed that the correlation was only significant in males in Group B.
Higher alpha angles and the presence of cam morphology were positively correlated with age, particularly in males at or before the time of skeletal maturation. The prevalence of cam morphology did not differ from those in other ethnicities.
IV.
本研究旨在评估年龄对α角和无症状凸轮形态发生率的影响。
回顾性收集无症状个体 8-22 岁的 X 线片。共纳入 1417 人，按年龄分组：8-12 岁（A 组）、13-18 岁（B 组）和 19-22 岁（C 组）。从前后位（AP）和蛙式侧位（FL）X 线片中获取右侧髋关节α角的影像学测量值。确定α角、凸轮形态存在与年龄之间的相关性。
三组的平均α角有统计学差异（p<0.001，每组）。两种 X 线片上的α角均与年龄呈正相关。组内分析显示，这种相关性仅在 B 组男性的 FL 图像中明显。影像学凸轮形态的存在也与年龄呈正相关（AP 和 FL 图像中均 p<0.001）。AP 图像上的凸轮形态在 A 组中为 0，在 B 组中为 17（3.0%），在 C 组中为 21（4.8%）；FL 图像上的凸轮形态在 A 组中为 2（0.3%），在 B 组中为 45（7.9%），在 C 组中为 103（23.6%）。组内分析显示，这种相关性仅在 B 组男性中具有统计学意义。
较高的α角和凸轮形态的存在与年龄呈正相关，尤其是在骨骼成熟前或骨骼成熟时的男性中。凸轮形态的患病率与其他种族无差异。
IV。
