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Fig. 3D —20-year-old man with bilateral gluteal contracture. Spin-echo T1-weighted axial image (600/11) inferior in relation to C discloses atrophic and medial retraction of gluteus maximus muscles, thickening and retraction of distal tendons and iliotibial tracts (black arrow) posterior to proximal femurs, and resultant depressed grooves at muscle-tendon junctions. Exaggerated anteverted axis of femoral neck (double-headed arrow) suggests external rotation of proximal femur.