Radiostereometric Analysis (RSA) of the PROFEMUR® Preserve Classic Femoral Components

Study Overview
=================
Brief Summary
-----------------
MicroPort Orthopedics (MPO) is conducting this study to investigate the primary stability of its PROFEMUR® Preserve Femoral Components using radiostereometric analysis (RSA). RSA allows precise measurement of micromotion around orthopedic implants and hence, may estimate long-term fixation to bone.

Official Title
-----------------
Radiostereometric Analysis (RSA) of the PROFEMUR® Preserve Classic Femoral Components

Conditions
-----------------
Joint Disease, Osteoarthritis

Intervention / Treatment
-----------------
* Device: PROFEMUR Preserve Classic Femoral Components


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Subject is a candidate for primary THA for osteoarthritis Subject is able to undergo primary THA procedure Subject is a candidate to be implanted with the specified combination of components Subject is willing and able to complete required study visits and assessments Subject is willing to sign the approved Informed Consent document Exclusion Criteria: Subject has any of the following contraindications at the time of the implantation: Overt infection; Distant foci of infections (which may cause hematogenous spread to the implant site); Rapid disease progression as manifested by joint destruction or bone absorption apparent on roentgenogram; Skeletally immature (less than 21 years of age at time of surgery); Inadequate neuromuscular status (e.g., prior paralysis, fusion, and/or inadequate abductor strength), poor bone stock, poor skin coverage around the joint which would make the procedure unjustifiable; Subjects 76 years of age or older Subjects with post-traumatic arthritis in the affected hip Subjects with rheumatoid arthritis in the affected hip Subjects with hip dysplasia in the affected hip Subjects with prior arthroplasty of the affected hip Subjects that are morbidly obese (BMI > 35) Subjects that are immuno-suppressed Subjects with known or tested-positive allergy to metals Subjects currently enrolled in another clinical investigation which could affect the endpoints of this protocol Subjects unwilling or unable to sign the Informed Consent document Subjects with substance abuse issues Subjects who are incarcerated or have pending incarceration

Ages Eligible for Study
-----------------
Minimum Age: 21 Years
Maximum Age: 76 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: PROFEMUR Preserve RSA<br>Single cohort of subjects prospectively implanted with PROFEMUR® Preserve Classic femoral components | Device: PROFEMUR Preserve Classic Femoral Components<br> <br> * Other names: Total Hip Arthroplasty System;|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Assess the stability of the PROFEMUR® Preserve Classic stem with RSA to estimate its long-term performance. | Assessment of the quantity of migration to determine if the total migration of the stem and cup at 2 years post¬operatively are less than 1.2 mm and 2.6mm, and also less than 0.4mm. Assessment of continuous migration to determine if continuous migration, defined as 0.2mm of motion between 1 and 2 years as measured with RSA exists in the stem and cup. | 24 months | 
| Determine the migration patterns of the PROFEMUR® Preserve Classic stem with RSA | Assessment of migration in each individual plane (x, y, and z), as measured in mm. | 24 months | 
| Assess if migration pattern is greater than 0.2mm between 1 and 2 years | To determine if the wear rate device is substantially less than the scientifically accepted threshold of 0.1 mm/year for osteolysis. The outcomes will be compared to data from the literature, which states that motion greater than 0.2mm between 1 and 2 years suggests an implant is at risk for early loosening. | 24 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Patient functional outcomes (HOOS) | The secondary objective is to determine if there is a significant difference in health status and functional outcomes (using the HOOS questionnaire) before and after total hip arthroplasty (THA) using the PROFEMUR® Preserve Femoral Components. | 24 months | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
osteoarthritis, radiostereometric analysis, correction of functional deformity, procedures, total hip arthroplasty, musculoskeletal diseases