The purpose of this study is to assess the migration pattern of the Insignia hip stem using radiostereometric analysis (RSA for short) and computed tomography (CT). Only patients with degenerative joint disease requiring primary total hip replacement will be asked to participate. The other purpose is to assess if there are any differences between the gold-standard RSA-measured migration and CT-RSA-measured migration. The clinical outcomes will be measured using joint function and patient satisfaction questionnaires. Approximately thirty patients will be enrolled onto the study.
This is a single-centre, non-randomized, non-controlled trial of patients undergoing primary total hip arthroplasty using the Insignia hip stem. Patients will undergo RSA and CT-RSA imaging and analyses to identify migration of the femoral stem with respect to the adjuvant bone during the first 2 post-operative years. The primary outcome of this study is to determine if femoral stem stability is achieved between 6-12 month and 12-24 month post-operative intervals.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
OTHER
Masking
NONE
Enrollment
25
* Insignia hip stem * Trident hemispherical shell * X3 polyethylene liner * Metal or ceramic head
Concordia Hip & Knee Institute
Winnipeg, Manitoba, Canada
Migration
Quantify migration of the Insignia stem using RSA and CT-RSA
Time frame: Up to 2 years post-operative
Validation
Comparison of RSA and CT-RSA using the standard deviation of the mean component migration calculated from examinations.
Time frame: Up to 2 years post-operative
Early migration
Quantify early migration of the Trident acetabular cup using RSA
Time frame: Up to 2 years post-operative
Changes in Oxford-12 Hip Score from baseline(pre-op) to 6-month, 1-year and 2-year
The Oxford Hip Score (OHS) is a patient self-administered 12-item questionnaire with each question having a Likaert-like response option. Each item is scored from 0 to 4, and the items are summated, with lower total scores indicating poorer performance. The OHS measures pain and general activities of daily living
Time frame: Up to 2 years post-operative
Changes in EQ-5D-5L from baseline(pre-op) to 6-month, 1-year and 2-year
The EuroQol 5D 5L questionnaire is a standardized instrument for use as a measure of health outcome that is designed for completion by the subject.
Time frame: Up to 2 years post-operative
Changes in Patient Satisfaction (VAS) from baseline(pre-op) to 6-month, 1-year and 2-year
Evaluate and compare the change from preoperative to 2 years in patient reported satisfaction as measured using the visual analogue scale (VAS) from 0 (Unsatified) - 100 (Completely Satisfied).
Time frame: Up to 2 years post-operative
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