Treatment of Arthritis Associated With Legg–Calve–Perthes Disease With Modular Total Hip Arthroplasty

Legg–Calve–Perthes (LCP) disease can result in morphological deformities and associated adult hip arthritis. Thirty-five consecutive total hip arthroplasties (THA) were performed in 28 patients with a history of LCP using a non-cemented modular femoral component. There was one revision for late hematogenous infection and no evidence of prosthesis failure. Harris hip scores, on average, improved from 49.8 (26–73) to 93.9 (82–100) (P < 0.05) after a minimum of 2 years follow-up (average, 8.2 years, range 2–14 years). Clinically, patients demonstrated diminished or no limping (94%, 33/35) and improved leg length equality post-operatively (100%, 35/35). This style of stem accommodated metaphyseal/diaphyseal size mismatch in 80% (28/35), allowed for abnormal anteversion in 71% (25/35), and resulted in radiographic improvements in trochanteric height (P < 0.05), body weight lever arm (P < 0.05), and leg length (P < 0.05).