Comparison of Two Methods of Patellar Resurfacing in Total Knee Arthroplasty

Peking University

Status: Unknown

Conditions: Osteoarthritis

Treatments: Procedure: Patellar resurfacing with freehand technique; Procedure: Patellar resurfacing with resection guide technique

Study type: Interventional

Funder types: Other

Identifiers

NCT02268097

YJK-003

Details and patient eligibility

About

The aim of this prospective, randomized study was to compare the clinical and radiological results of "free-hand" technique and "resection guide" technique for preparing patella during total knee arthroplasty.

Full description

With improved surgical techniques and implant designs, patella resurfacing has been favored by increasing surgeons. When performing the resection, several principles such as restoring the original patellar thickness, avoiding over or under resection must be complied in order to achieve satisfactory outcomes.This study was conducted to compared the outcomes of two commonly adopted methods for performing patellar resection in total knee arthroplasty. One hundred patients with osteoarthritis were recruited in the clinical trial using Nexgen Legacy Posterior Stabilized-Flex prosthesis. Patients were randomized to receive "free-hand" technique and "resection guide" technique when performing patellar resection in total knee arthroplasty. Patients were evaluated preoperatively and at follow-up visits conducted at twelve months, at twenty-four months. Clinical outcome was assessed and compared with use of the visual analogue pain scale (VAS), range of motion, Knee Society Score (KSS), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and the Short Form-36 (SF-36). Patellar alignment was assessed before surgery and at each follow-up by measuring the patellar tilt (PT) and lateral patellar displacement (PD). Prosthetic position and leg alignment were also compared between the two groups.

Enrollment: 101 patients

Sex: All

Ages: 45+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

diagnosis of primary osteoarthritis of the knee, with Ahlbäck grade of ≥2 (symptoms persisting after conservative treatment for at least 3 months) knees with <20° varus or <15° valgus deformity patellar thickness is more than 21mm

Exclusion criteria

restricted motion (flexion contracture of >25°) patella alta (Insall-Salvati ratio of <0.6) history of previous knee surgery

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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101 participants in 2 patient groups

Freehand

Experimental group

Description:

Patellar resurfacing with freehand technique:Using freehand technique for patella preparation during total knee arthroplasty.

Treatment:

Procedure: Patellar resurfacing with freehand technique

Resection guide

Active Comparator group

Description:

Patellar resurfacing with resection guide technique: Using patellar resection guide technique for patella preparation during total knee arthroplasty.

Treatment:

Procedure: Patellar resurfacing with resection guide technique