A, Adult patient with Morquio disease with bilateral dislocated hips. Left hip was painful and disabling. B, Appearance after total hip arthroplasty using custom-designed femoral component with small stem. Despite this, femoral shaft proximally was fractured during insertion. C, Appearance after revision of total hip arthroplasty with second custom-designed long-stem femoral component and anchoring screws in methylmethacrylate. Result was satisfactory.