MIRALab, University of Geneva, 7 Route de Drize, Carouge, Switzerland.
Am J Sports Med. 2011 Mar;39(3):557-66. doi: 10.1177/0363546510386002. Epub 2010 Dec 15.
Early hip osteoarthritis in dancers could be explained by femoroacetabular impingements. However, there is a lack of validated noninvasive methods and dynamic studies to ascertain impingement during motion. Moreover, it is unknown whether the femoral head and acetabulum are congruent in typical dancing positions.
The practice of some dancing movements could cause a loss of hip joint congruence and recurrent impingements, which could lead to early osteoarthritis.
Descriptive laboratory study.
Eleven pairs of female dancer's hips were motion captured with an optical tracking system while performing 6 different dancing movements. The resulting computed motions were applied to patient-specific hip joint 3-dimensional models based on magnetic resonance images. While visualizing the dancer's hip in motion, the authors detected impingements using computer-assisted techniques. The range of motion and congruence of the hip joint were also quantified in those 6 recorded dancing movements.
The frequency of impingement and subluxation varied with the type of movement. Four dancing movements (développé à la seconde, grand écart facial, grand écart latéral, and grand plié) seem to induce significant stress in the hip joint, according to the observed high frequency of impingement and amount of subluxation. The femoroacetabular translations were high (range, 0.93 to 6.35 mm). For almost all movements, the computed zones of impingement were mainly located in the superior or posterosuperior quadrant of the acetabulum, which was relevant with respect to radiologically diagnosed damaged zones in the labrum. All dancers' hips were morphologically normal.
Impingements and subluxations are frequently observed in typical ballet movements, causing cartilage hypercompression. These movements should be limited in frequency.
The present study indicates that some dancing movements could damage the hip joint, which could lead to early osteoarthritis.
舞者的早期髋关节骨关节炎可能是由股骨髋臼撞击引起的。然而，目前缺乏经过验证的非侵入性方法和动态研究来确定运动过程中的撞击。此外，在典型的舞蹈姿势中，股骨头和髋臼是否一致尚不清楚。
某些舞蹈动作的练习可能导致髋关节失去一致性和反复撞击，从而导致早期骨关节炎。
描述性实验室研究。
对 11 对女性舞者的臀部进行了光学跟踪系统的运动捕捉，同时进行了 6 种不同的舞蹈动作。根据磁共振成像的患者特定髋关节 3 维模型，应用计算得到的运动。在可视化舞者的运动过程中，作者使用计算机辅助技术检测撞击。在这 6 个记录的舞蹈动作中，还定量了髋关节的运动范围和一致性。
撞击和半脱位的频率因运动类型而异。根据观察到的高撞击频率和半脱位量，有 4 种舞蹈动作（développé à la seconde、grand écart facial、grand écart latéral 和 grand plié）似乎对髋关节造成了明显的压力。股骨髋臼移位较大（范围为 0.93 至 6.35 毫米）。对于几乎所有的动作，计算出的撞击区域主要位于髋臼的上或后上象限，这与放射学诊断的髋臼唇损伤区域有关。所有舞者的髋关节形态均正常。
在典型的芭蕾舞动作中经常观察到撞击和半脱位，导致软骨过度压缩。这些动作的频率应该受到限制。
本研究表明，某些舞蹈动作可能会损伤髋关节，从而导致早期骨关节炎。
