Tapered Titanium Porous Plasma-Sprayed Femoral Component in Patients 40 Years and Younger

Total hip arthroplasty (THA) performed in patients 40 years and younger requires several decades of implant use under increased activity demands. Implant longevity and stable fixation is necessary for 30 or more years. The current study investigates the longevity of the Mallory-Head primary porous femoral stem in primary THA in patients 40 years and younger at the time of the THA. Between 1987 and 2000, 249 primary THA in patients 40 years or younger were performed with the Mallory-Head porous femoral component in one practice. The average age at the time of THA was 34.7 years (range, 20-40 years). Average height, weight, and BMI were 67 in, 187 lb, and 29 kg/m², respectively. Follow-up averaged 91 months with 125 hips having minimum 5-year follow-up and 51 THA having minimum 10 years. Harris hip score improved an average of 37 points. Four stems have failed for 98.2% overall survivorship at 5, 10, and 15 years. Only two stems were revised for loosening for a 99.2% (95% CI, 96.4-99.8) survivorship with aseptic loosening as the end point at 5, 10, and 15 years. In young patients, this tapered titanium, proximally porous plasma-sprayed femoral component provides outstanding long-term fixation and function with significant pain relief into the second decade. Overall femoral stem survivorship is 98.2% at up to 18 years.