MODULUS Stem for Developmental Hip Dysplasia: Long-term Follow-up

Abstract Between October 2001 and December 2010, 143 patients with developmental dysplasia underwent hip arthroplasty surgery using a conical stem with modular necks (MODULUS system, Lima Corporate, Villanova di San Daniele del Friuli, Italy). Thirty (21.0%) patients had both hips replaced, for a total of 173 implants. The mean age at the time of surgery was 55years (range: 22–81years). The mean follow-up was 87months (range: 36–146months); average Harris Hip Score increased from 42 (range: 23–65) preoperatively to 92 (range: 76–100) at the last follow-up. Stem revision was required in two cases. The MODULUS stem showed good long-term clinical and radiographic results, with a Kaplan–Meier survivorship of 97.6% (95% CI: 94.8–100.0%) at 8years.