The Mayo cementless femoral component in active patients with osteoarthritis.

This prospective study reports the clinical and radiological results of a single-surgeon series using the Mayo conservative hip stem in a district hospital. 30 total hip arthroplasties were performed in 26 physically active patients. There were 18 women and 8 men, with a mean age of 57.4 years (range 36-79). 4 cases were bilateral. The operation was performed for severe primary or secondary osteoarthritis of the hip .Duration of follow-up ranged from 67-87 months (mean 81 months). There were no early complications relating to the surgical procedure. There was one case of traumatic fracture of the femur during rehabilitation,while late complications included two cases of late infection (4 months and 16 months after surgery)both revised in two-stage procedures. There was considerable improvement in Merle d'Aubignescore following surgery. There were no revisions for aseptic loosening, but we identified 2 implants with significant radiolucent lines and subsidence six years after the index operation. Neither patient experienced pain in the hip or restriction of activity. Therefore, the aseptic loosening survival rate was 100%(end point = revision operation). Taking radiological loosening as the end point survivorship was 93.3%.The use of the Mayo short stem component in active patients may preserve bone and enable subsequent revision operations to proceed using primary implants. Our results suggest that conservative designs of this type may be of benefit in selected individuals.