Total hip replacement surgery is one of the most successful procedures in orthopaedic surgery - one that restores function and quality of life. Traditional components include an acetabular component and a femoral component, which in recent years have come to heavily rely on biologic fixation rather than traditional cemented fixation. In our study we look at the safety and efficacy of an uncemented, hemispherical acetabular component that has been used by many orthopaedic surgeons for hip replacement, with a minimum 5 year follow up, in a cohort of over 250 consecutive patients over a four year period. Outcomes would be measured by radiographic parameters such as osseointegration, absence of radiographic lucency, presence of stress induced hypertrophy of bone, demarcation, etc. Our hypothesis is that this particular cup being studied has an exceptional track record and will prove to be safe and efficacious in contemporary total hip replacement. The student's role will be to collect demographic and clinical data through chart review. Additionally, the student will perform radiographic analysis to measure osseointegration over time.