Long-term Evaluation Protocol (12 Months Postoperative) of Total Knee Prostheses Anatomic With Resurfaced Patella Versus Non-resurfaced Patella in Patients Requiring Total Knee Arthroplasty

Not Applicable

Completed

Brief Summary: Total knee arthroplasty is a frequent surgery in France. It currently represents 70,000 interventions per year. The total knee prosthesis is also called tri-compartmental because it allows articulation between the femur and the tibia but also between the femur and the patella.

The patella belongs to the extensor system. It articulates with the femoral trochlea in which it slides. It has an important biomechanical role on the quadriceps strength in addition to allowing flexion-extension movements.

In the case of resurfacing, the joint face of the patella is cut off; A convex polyethylene implant is sealed with cement using studs on the same face.

In case of non-resurfacing, the surgeon leaves in place the cartilage of the patella which will be in direct contact with the femoral prosthetic trochlea.

Both methods have advantages and disadvantages. For some implants, it is recommended to resurface the patella because the implant is not very tolerant with the native patella. Other implants have been designed to be better adapted to the preservation of patellar cartilage.

There is currently no evidence that one method is superior to the other on new generation implants known as "patellar friendly".

It seems necessary to compare both methods in terms of long-term postsurgery results.

Detailed Description: The analysis of the primary endpoint (International Knee Society score (IKS score)) will be based on the assumption that the postsurgery score will be identical in both groups. The t test for independent samples will be used to test this hypothesis.

Recruitment & Eligibility

Inclusion Criteria

Male or Female (age ≥ 18 years)
Diagnosis of knee arthrosis (internal femoro-tibial arthrosis, external femorotibial osteoarthritis, femoro-patellar arthrosis)
Indication of total first-line knee arthroplasty

Exclusion Criteria

Patient whose surgical complexity requires the placement of a strained prosthesis (ligament laxity, bone loss).
Refusal to participate in the study
Pregnant women, parturients or nursing mothers
Persons deprived of their liberty by a judicial or administrative decision, persons subject to psychiatric care, persons admitted to a health or social institution for purposes other than research
Minor Patients
Major persons who are subject to a legal protection measure or are unable to express their consent
Patient not affiliated to a social security scheme
Patient participating in other interventional research excluding routine care studies not interfering with analysis of primary endpoint

Arm && Interventions

Group	Intervention	Description
Patellar resurfacing	Patellar resurfacing	Patellar resurfacing during the total knee prosthesis Anatomic surgery
Patellar non-resurfacing	Patellar non-resurfacing	Patellar non-resurfacing during the total knee prosthesis Anatomic surgery

Primary Outcome Measures

Name	Time	Method
measure of International Knee Society score (IKS score)	12 months after surgery	The comparison of the IKS (International Knee Society) scores (2011 version) will be done between both groups.

Secondary Outcome Measures

Name	Time	Method
Measure of the forgotten joint score	12 months after surgery	The comparison of the forgotten joint score will be done between both groups.
abnormality of the patellar stroke	12 months after surgery	Presence of an abnormality of the patellar stroke with the type of tilting, subluxation or dislocation of the patella on the X-ray images.

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