Electronic Thesis and Dissertation Repository


Master of Science




Lanting, Brent

2nd Supervisor

Teeter, Matthew



Total hip arthroplasty (THA) is one of the most successful surgical procedures performed worldwide. Recent advances in implant technology and popularization of the muscle-sparing Direct Anterior (DA) approach to the hip has led to younger patients becoming candidates for hip arthroplasty surgery. Among the many considerations necessary for success in this patient population, implant design plays an important role in determining outcomes.

In this thesis, we prospectively evaluated patients who received a collared or collarless fully hydroxyapatite-coated femoral stem during THA with a standard RSA protocol to assess stem migration patterns following surgery.

Preliminary results indicate that collarless stems subside significantly more than collared stems within the first 2-4 post-operative weeks, with no differences in patient-reported outcome data between the two cohorts. Further study with longer-term follow-up is indicated to establish migration patterns within the first 2 post-operative years, and whether the discrepancies between cohorts manifest any clinical consequences.

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Orthopedics Commons