To assess the follow up results of more than five years of total hip arthroplasty using circumferencially porous coated Multilock® femoral stem and to determine the prevalence of femoral osteolysis.

We assessed the Harris hip score, fit of the stem, fixation status at the latest follow up, radiolucent lines, and stress shielding of 71 cases in 60 patients.

The average Harris hip score improved from 51.4 points preoperatively to 91.7 points at the latest follow up. Radiologic analysis revealed excellent bony ingrowth (93%), while 10 hips (14.1%) revealed femoral osteolyis mostly in zones I and VII.

The midterm results of using the Multilock® stem showed excellent bony ingrowth. Osteolytic lesions were primarily limited to proximal zones I and VII, except 1 hip. It may be possible to protect from migration of the polyethylene debris paticle to the distal portion due to the excellent cirumferential osteointegration. Further follow up is required to determine the real prevalence of distal osteolysis.