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Am J Sports Med.: Assessment of congruence and impingement of the hip joint in professional ballet dancers: a motion capture study.

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. In this descriptive laboratory study, 11 pairs of female dancers' hips were motion captured with an optical tracking system while performing six different dance movements. The resulting computed motions were applied to patient-specific hip joint three-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. The frequency of impingement and subluxation varied with the type of movement. Four dance movements (developpe a la seconde, grand ecart facial, grand ecart lateral, and grand plie) 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. It is concluded that impingements and subluxations are frequently observed in typical ballet movements and could damage the hip joint, potentially leading to early osteoarthritis.

2011 Mar;39(3):557-66.

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Author:Charbonnier, C.; Kolo, F.C.; Duthon, V.B.; Magnenat-Thalmann, N.; Becker, C.D.; Hoffmeyer, P.; Menet
Publication:Journal of Dance Medicine & Science
Article Type:Reprint
Date:Jan 1, 2012
Words:244
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