Radiostereometric Analysis (RSA) and DEXA to Evaluate Fixation and Wear of the Restoration ADM Acetabular System

Prospective Clinical Study Using Radiostereometric Analysis (RSA) and DEXA to Evaluate Fixation and Wear of the Restoration ADM Acetabular System

The dual mobility design concept for acetabular liners, as is used in the Restoration ADM Acetabular System, has been applied in various implants since its introduction by Gilles Bousquet in France in 1976. Dual mobility cups have shown good clinical results and have been particularly lauded for low incidence of dislocations. However, the wear performance of this design concept has not been proven to date. As wear particles are a possible contributing factor in aseptic loosening, the assessment of wear and fixation is an important step in proving this implant design.

The proposed study will combine RSA and peri-prosthetic bone mineral density as well as outcome questionnaires to provide a complete in vivo evaluation of prosthesis fixation, polyethylene wear, and objective and subjective outcomes for the Restoration ADM Acetabular System.

Study Overview

• Status: Completed
• Conditions: Osteoarthritis
• Intervention / Treatment: Device: ADM Cup

Detailed Description

Question 1: a) Do the implant components of the Restoration ADM Acetabular System achieve adequate fixation to the underlying bone? Null Hypothesis: There is no significant increase in micromotion of the implant components after 1 year indicating adequate long-term fixation at the implant - bone interface. Alternative Hypothesis: There is a significant increase in micromotion of of the implant components after 1 year indicating inadequate fixation at the implant - bone interface. b) What are the migration patterns (translations and rotations) of the Restoration ADM Acetabular System components during the first three years postoperatively? c) For what proportion of implants does migration continue to increase during the three year follow-up? d) Are inducible displacements, measured during weight-bearing follow-up exams, consistent over time and do they indicate that adequate fixation has been achieved? e) Are there significant differences in migration patterns (translations and rotations) between the Restoration ADM Acetabular System components and other implants previously studied with RSA and reported in the literature? Question 2: a) How much does the femoral head wear into the polyethylene liner?b)How much backside wear occurs on the polyethylene liner? c)How does the total wear compare to that with other implants previously reported in the literature? Question 3: Does the polyethylene liner demonstrate mobile bearing properties? Question 4: a) Are there changes over time in bone mineral density of peri-prosthetic bone with the Restoration ADM Acetabular System components? b) Where do changes in bone mineral density occur? Question 5: Does total hip arthroplasty using the Restoration ADM Acetabular System result in significant improvement in health status and functional outcome?

• Study Type: Observational
• Enrollment (Actual): 30

Contacts and Locations

Study Locations

• Canada
  • Nova Scotia
    • Halifax, Nova Scotia, Canada, B3H 3A7
      • Capital District Health Authority

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 21 years to 80 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Osteoarthritis of the hip

Description

Inclusion Criteria:

1. Symptomatic osteoarthritis of the hip indicating primary total hip arthroplasty
2. Between the ages of 21 and 80 inclusive
3. Patients willing and able to comply with follow-up requirements and self-evaluations
4. Ability to give informed consent

Exclusion Criteria:

1. Inflammatory arthritis
2. BMI >40
3. Post-traumatic arthritis of the hip
4. Prior arthroplasty with the affected hip
5. Hip dysplasia
6. Active or prior infection
7. Medical condition precluding major surgery
8. Severe osteoporosis or osteopenia

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
ADM; ADM Cup	Device: ADM Cup; ADM Cup; Other Names: Styrker ADM Acetabular Cup

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
RSA migration	3 years

Secondary Outcome Measures

Outcome Measure	Time Frame
RSA wear	3 years
Questionnaires	3 years

Collaborators and Investigators

• Sponsor: Dalhousie University
• Investigators: Principal Investigator: Michael Dunbar, MD, FRCSC, PhD, Dalhousie University

Study record dates

Study Major Dates

• Study Start: November 1, 2011
• Primary Completion (Actual): July 1, 2016
• Study Completion (Actual): December 1, 2019

Study Registration Dates

• First Submitted: January 7, 2011
• First Submitted That Met QC Criteria: January 7, 2011
• First Posted (Estimate): January 10, 2011

Study Record Updates

• Last Update Posted (Actual): August 19, 2021
• Last Update Submitted That Met QC Criteria: August 18, 2021
• Last Verified: August 1, 2021

More Information

Terms related to this study

• Keywords: Osteoarthritis
• Additional Relevant MeSH Terms: Joint Diseases; Musculoskeletal Diseases; Rheumatic Diseases; Arthritis; Osteoarthritis
• Other Study ID Numbers: CDHA-RS/2012-079