Dynamic Ultrasonography Of Hip Translational Motion In Professional Ballet Dancers

PURPOSE: To determine values of femoroacetabular translation using dynamic ultrasonography in professional ballet dancers to advance our understanding of hip microinstability. METHODS: A cross-sectional cohort study was performed on dancers 18-40 years. Trochanteric Prominence Angle Test (TPAT) was used to assess femoral rotation. Ligamentous laxity was determined by Beighton score. Bilateral hips were evaluated for femoroacetabular translation by measuring femoral head position related to the acetabulum. Three positions for anterior translation included: neutral (N), neutral-flexed (NF), extension-external rotation (EER) (d’Hemecourt PD et al, CORR 2019) and posterior translation: neutral (PN), flexion, adduction and internal rotation (PFADIR), stand-and-load (PStand) (Le H et al, CJSM 2023 Under Review). Anterior and posterior femoroacetabular translation were calculated using mean delta value (mm) between NF and EER positions and PN and PFADIR positions, respectively. RESULTS: Table 1 presents descriptive statistics, table 2 ultrasound measures. 32 hips were evaluated (8F, 8 M). Mean Beighton score was 3.88 ± 2.70 in males and 5.75 ± 2.61 in females. Mean delta value for anterior femoroacetabular translation for females was 2.98 ± 1.97 mm and 1.85 ± 1.47 mm for males. Mean delta value for posterior femoroacetabular translation was 8.11 ± 3.36 mm for females and 7.67 ± 2.12 mm for males. CONCLUSION: Anterior and posterior femoroacetabular translation was measured using dynamic hip ultrasonography in professional ballet dancers. This data will further understanding of hip microinstability in dancers.