Acetabular Cup, Total Hip Arthroplasty
Conditions
Keywords
Trident, RSA, THA
Brief summary
The objective of this study is to use radiostereometric analysis (RSA) and clinical outcome measures to evaluate early post-operative implant stability and the clinical performance of Stryker's Trident II Acetabular Cup.
Detailed description
The proposed study is a prospective evaluation of data from patients undergoing primary total hip arthroplasty using the Trident II acetabular cup. Fifty patients will be recruited for this study. All patients that qualify for the study per the inclusion-exclusion criteria and provide written informed consent will receive the Trident II acetabular cup and RSA beads. Implant stability, through RSA, will be measured throughout the first two postoperative (post-op) years per the following schedule: immediate post-op and 6 weeks, 3 months, 6 months, 1 year, and 2 years following surgery. Patients will be discharged and seen for follow-up assessments as per standard of care. Adverse events that are related to the index joint will be collected. Health outcome questionnaires will be collected. The health outcome questionnaires will include: EQ-5D, HOOS JR and Harris Hip Score. Health outcome questionnaires will be completed pre-operatively and again at 6 weeks, 3 months, 6 months, 1 year and 2 years following surgery. Conventional x-ray analysis will be performed pre-operatively and again at 6 weeks, 1 year and 2 years following surgery.
Interventions
RADIATIONRadiostereometric Analysis
RSA exams of the operative hip are received post-op day 1, and at 6 weeks, 3 months, 6 months, 1 year and 2 years following surgery
PROCEDUREtotal hip arthroplasty with RSA bead implantation
Patients receive RSA beads inserted into the bone surrounding the Trident II implant.
Sponsors
Midwest Orthopaedics at Rush
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 85 Years
Healthy volunteers
No
Inclusion criteria
1. Symptomatic arthritis of the hip indicating surgical intervention 2. Scheduled to undergo a primary total hip arthroplasty 3. Patient is a candidate for the Trident II acetabular cup in accordance with product labeling -
Exclusion criteria
1. Patients less than 18 years of age, or older than 85 years of age. 2. Severe hip dysplasia (Crowe Type III or IV) in the affected hip 3. History of congenital dislocation 4. Prior arthroplasty of the affected hip 5. Active or prior infection of the affected hip 6. Morbid obesity (BMI \> 40) 7. Medical condition precluding major surgery 8. Severe osteoporosis 9. Neuromuscular impairment 10. Patients with known allergy to metals 11. Pregnancy 12. Patients on dialysis or creatinine \> 2.0 13. Patient is immuno-suppressed -
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Does the Trident II Cup achieve acceptable fixation to the underlying bone? | 3 years | The Trident II Cup proximal migration will be assessed. Migration of less than 0.2mm at 2 years and without continuous migration between post-operative year 1 and 2 will indicate acceptable fixation. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| What are the migration patterns of the Trident II acetabular cup over the first two post-operative years? | 3 years | Migration patterns will be assessed using RSA analysis. |
| Is there a significant difference in health status and functional outcome before and after hip arthroplasty using Trident II Cup? | 3 years | The health status and functional outcome will be assessed via Harris Hip Score. |
| Is there a correlation between radiolucent lines measured by Charnley-DeLee zone analysis and migration characteristics using RSA? | 3 years | X-ray radiographs will be taken at pre-op, 6 weeks, 1 year and 2 year appointments. It may take up to 3 years after study start for all patients to reach the 2 year visit mark, depending on how long enrollment takes. |
| Can inducible displacements measured at 1 year post-operative distinguish patients identified by RSA measurements as having inadequate fixation? | 2 years | Inducible displacements will be measured using RSA exams at the 1 year follow-up. It may take up to 2 years after study start for all patients to reach the 1 year visit mark, depending on how long enrollment takes. |
Countries
United States
Outcome results
None listed