GMK-UNI Anatomical UKA: Fixation of Cemented vs Cementless Designs

NCT ID: NCT03522025

Last Updated: 2025-09-25

Basic Information

• Recruitment Status: ACTIVE_NOT_RECRUITING
• Clinical Phase: NA
• Total Enrollment: 70 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2019-02-15
• Study Completion Date: 2026-12-01

Brief Summary

Unicompartmental knee arthroplasty (UKA) is the principal surgical alternative to the total knee arthroplasty (TKA) in patients with end-stage unicompartmental tibiofemoral osteoarthritis (OA) of the knee. The current comparative randomized study aims to evaluate the fixation of cemented and cementless designs of GMK-UNI unicompartmental knee prosthesis over a 5-year time period.

Detailed Description

The Primary objective is to compare the quality of fixation of cemented and cementless designs of GMK-UNI unicompartmental knee replacement at 2 years of follow-up.

The Secondary objectives include the evaluation of the patient improvement (subjective and objective) using the new Knee Society Score (KSS); the patient's anterior pain following UKA and any eventual patella-femoral disorder; Implant survival rate using the Kaplan Meier analysis; Post-op radiological findings and Adverse Events.

The Primary outcome aims to compare the occurrence of radiolucency's lines (both partial and complete) between the two study groups. Secondary outcomes include New KSS, OKS, Kaplan Meier analysis and stability and fixation of UNI prosthesis.

All patients who meet the inclusion criteria to take part in the current clinical study will be invited to participate before the surgery.

Subjects will be randomized during the screening; half of them will receive the cemented GMK-UNI anatomical UKA and the other half the cementless GMK-UNI anatomical UKA.

Clinical data will be recorded on CRF at those time-points:

• Before the surgery
• During the surgery
• After the surgery at 3 months, 1, 2, 3 and 5 years.

Conditions

Osteoarthritis, Knee

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: OTHER
• Blinding Strategy: NONE

Study Groups

GMK-UNI cemented fixation prosthesis

Unicompartmental Knee Arthroplasty (UKA)

Group Type: ACTIVE_COMPARATOR

Unicompartmental Knee Arthroplasty (UKA)

Intervention Type: DEVICE

Unicompartmental Knee Arthroplasty (UKA) is a less invasive treatment option compared to Total Knee Arthroplasty (TKA) for patients with primary anteromedial knee osteoarthritis.

GMK-UNI cementless fixation prosthesis

Unicompartmental Knee Arthroplasty (UKA)

Group Type: EXPERIMENTAL

Unicompartmental Knee Arthroplasty (UKA)

Intervention Type: DEVICE

Unicompartmental Knee Arthroplasty (UKA) is a less invasive treatment option compared to Total Knee Arthroplasty (TKA) for patients with primary anteromedial knee osteoarthritis.

Interventions

Unicompartmental Knee Arthroplasty (UKA)

Unicompartmental Knee Arthroplasty (UKA) is a less invasive treatment option compared to Total Knee Arthroplasty (TKA) for patients with primary anteromedial knee osteoarthritis.

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

• Patients with end-stage unicompartmental tibiofemoral osteoarthritis (OA) of the knee that meet the indications for use according to Medacta implants included in this study (on-label use);
• Those suffering from unilateral osteoarthritis or osteonecrosis of the medial compartment;
• Frontal deformity < 10° (evaluated on weight-bearing long-axis x-rays);
• Flexion contracture < 10°;
• Intact ligaments;
• Patients who are willing and able to provide written informed consent for participation in the study. Written informed consent must be obtained prior to the patient's surgery;
• Patient's age over 18 years old;
• Patient with BMI < 40 kg/m2;
• Patients must be willing to comply with the pre and post-operative evaluation schedule.

• Patients aged under 18 years;

Exclusion Criteria

• Patients with one or more medical conditions identified as a contraindication defined by the labelling on any Medacta implants used in this study;
• Any patient who cannot or will not provide informed consent for participation in the study;
• Patients who need to undergo lateral unicompartmental knee arthroplasty;
• Patients who need a revision surgery;
• Patients who need a patella-femoral joint prosthesis;
• Patients who had previously undergone high tibial osteotomy or ACL reconstruction;
• Patients with BMI ≥ 40 kg/m2;
• Patients unable to understand and take action;

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 95 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Medacta International SA

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

Clinique Saint Vincent de Paul

Bourgoin, France, France

Clinique du Mail

La Rochelle, France, France

Centre Orthéo, Espace Fauriel

Saint-Etienne, France, France

CHP Saint-Grégoire

Saint-Grégoire, France, France

Dr. Näder Helmy

Solothurn, Switzerland, Switzerland

Countries

France; Switzerland

Other Identifiers

2017-01677

Identifier Type: -

Identifier Source: org_study_id