- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03391323
Medacta GMK Sphere® vs. Medacta GMK PS Post-Market Outcomes Study
September 27, 2021 updated by: David F. Scott, MD
Medacta GMK Sphere® Medial-Pivot, Cruciate Substituting vs. Medacta GMK PS Posterior Stabilized Kne vs. OMNI Apex Knee Ultracongruent vs. Triathlon® Posterior Stabilized & Cruciate Substituting Outcomes Study
The study is a prospective, randomized comparison of total knee arthroplasty with the Medacta GMK Sphere® knee compared to the Medacta GMK PS knee, with comparison to data from previous trials of similar study design.
Study Overview
Status
Active, not recruiting
Conditions
Study Type
Interventional
Enrollment (Actual)
218
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
Washington
-
Spokane, Washington, United States, 99218
- Spokane Joint Replacement Center
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
19 years to 78 years (Adult, Older Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Patients willing to sign the Informed Consent.
- Patients able to comply with follow-up requirements including postoperative weight bearing restrictions and self-evaluations.
- Male and non-pregnant female patients ages 21 - 80 years of age at the time of surgery.
- Patients requiring a primary total knee replacement.
- Patients with a diagnosis of osteoarthritis (OA), traumatic arthritis (TA), or avascular necrosis (AVN).
- Patients with intact collateral ligaments.
Exclusion Criteria:
- Patients with inflammatory arthritis.
- Patients that are morbidly obese, body mass index (BMI) > 40.
- Patients with a history of total or unicompartmental reconstruction of the affected joint.
- Patients with neuromuscular or neurosensory deficiency, which would limit the ability to assess the performance of the device.
- Patients with a systemic or metabolic disorder leading to progressive bone deterioration.
- Patients that are immunologically compromised, or receiving chronic steroids (>30 days), excluding inhalers.
- Patients bone stock is compromised by disease or infection, which cannot provide adequate support and/or fixation to the prosthesis.
- Patients with knee fusion to the affected joint.
- Patients with an active or suspected latent infection in or about the knee joint.
- Patients whose surgery will utilize computer-assisted surgical navigation (CAOS) techniques.
- Patients whose surgery will utilize minimally invasive surgical techniques.
- Patients that are prisoners.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Other
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Other: Medacta GMK Sphere® Medial-Pivot Knee Prosthesis
|
|
Other: Medacta GMK PS Posterior Stabilized Knee Prosthesis
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Forgotten Joint Score (FJS)
Time Frame: Change from baseline at 2 years and 5 years post-operative
|
The average Forgotten Joint Score (FJS) of those patients receiving the Medacta GMK Sphere® knee prosthesis will be compared with the average FJS of those receiving the Medacta GMK PS knee prosthesis. The FJS total score range is 0-100, with higher scores indicating a higher degree of "forgetting" the artificial joint, that is, a lower degree of awareness. |
Change from baseline at 2 years and 5 years post-operative
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Total Knee Society Score (KSS)
Time Frame: Pre-operative, 6 weeks, 6 months, 1, 2, 3, 4, and 5 years post-operative
|
Clinical outcomes will be evaluated via the Knee Society Score (KSS).
The KSS is subdivided into a Knee Assessment score which rates only the knee joint itself, and a Functional Assessment score which rates the subject's ability to walk and climb stairs.
Both scores range from 0-100, with a higher score indicating a better outcome.
|
Pre-operative, 6 weeks, 6 months, 1, 2, 3, 4, and 5 years post-operative
|
Lower Extremity Activity Scale (LEAS)
Time Frame: Pre-operative, 6 weeks, 6 months, 1, 2, 3, 4, and 5 years post-operative
|
Clinical outcomes will be evaluated via the Lower Extremity Activity Scale (LEAS).
The LEAS scale range is 1-18, with a higher value indicating a higher level of activity.
|
Pre-operative, 6 weeks, 6 months, 1, 2, 3, 4, and 5 years post-operative
|
Radiographic Analysis
Time Frame: Pre-operative, 6 weeks, 6 months, 1, 2, 3, 4, and 5 years post-operative
|
Radiographs will be assessed for radiolucency, migration and subsidence.
An AP Longstanding view will be obtained pre-operatively, and at 6 weeks and 1 year post-operatively to determine degree of Varus or Valgus.
|
Pre-operative, 6 weeks, 6 months, 1, 2, 3, 4, and 5 years post-operative
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Investigators
- Principal Investigator: David Scott, MD, Spokane Joint Replacement Center
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
April 1, 2015
Primary Completion (Anticipated)
December 1, 2023
Study Completion (Anticipated)
December 1, 2023
Study Registration Dates
First Submitted
December 11, 2017
First Submitted That Met QC Criteria
December 29, 2017
First Posted (Actual)
January 5, 2018
Study Record Updates
Last Update Posted (Actual)
September 28, 2021
Last Update Submitted That Met QC Criteria
September 27, 2021
Last Verified
September 1, 2021
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- SJRC-GMK
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
No
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
Yes
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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