Current Projects

Retrospective Analysis of Bilateral Hip Replacement Whereby One Side Received the Direct Anterior Approach (MRI Study):

The Primary objective of this study is to compare 2 different approaches for hip replacement in patients having undergone bilateral Total Hip Arthroplasty (THA). The study will evaluate the effect of the anterior approach on long term outcomes, functional muscle testing and MRI evaluations.

The patient population will consist of all adult human subjects having undergone primary total hip replacement in both hips whereby one of them has received the minimally invasive direct anterior approach. Upon initial evaluation, the patient will be presented with the consent form to enroll in the study protocol. Data will be collected with teleform generated scantrons as per protocol. Teleform is a product sold by Verity, Inc. which allows the creation of scantron forms which can be used to collect large quantities of data efficiently and accurately. This eliminates the need for manual key data entry into the database. Data will be collected prospectively and retrospectively and will be entered into the database generated from Memorial Bone and Joint Research Foundation.

Pre-operative forms

Demographic data will be collected by the PI during the initial clinical visit as part of the routine evaluation of the patient. The patient will then be asked to fill out a 4 page "pre-operative hip questionnaire" which includes question of the Hip Disability and Osteoarthritis Outcome Score (HOOS). A signed and witnessed informed consent will be obtained.

Intra-operative and hospital data collection form

The intra-operative data collection form is used to collect general operative data such as surgical time, blood loss, anesthesia type, ASA classification and others as outlined in the addendum "hip operative".

Post-operative data collection form

Patients will be asked to fill out a post-operative hip questionnaire very similar to the pre-operative questionnaire to evaluate the improvement in their clinical outcome. These questionnaires will be filled out after 6 months from their initial evaluation, and annually thereafter and during any follow-up visits they may have.

Functional muscle testing

Patients in this study will undergo manual muscle test using "Nicholas manual muscle tester or equivalent". These tests will be performed following the protocol on the following muscles; gluteus medius, gluteus maximus, tensor fascia latte, quads and hamstrings. Another test performed on the muscles will be the muscles fatigue testing.

MRI evaluation

We will obtain MRI of all patients according to the protocol described. MRI scans will be evaluated by 2 independent radiologists looking at tendon defects, diameter, signal intensity and ossification. Surgical findings and the MRI scan will be correlate and the differences in the frequencies of findings between the two hips will be tested for significance by using x2 analysis.