Comparison of Removing and Non-removing Patellofemoral Joint Osteophytes Following Medial Unicompartment Knee Arthroplasty

Completed

• Conditions: Anterior Knee Pain
• Interventions: Procedure: removing osteophyte at patellofemoral joint

• Registration Number: NCT05367375
• Lead Sponsor: Thammasat University

Brief Summary

Background: Anterior knee pain (AKP) is a challenge following unicompartmental knee arthroplasty (UKA). Some surgeons remove patellofemoral joint (PFJ) osteophytes to reduce osteophyte impingement and AKP. However, there is evidence that PFJ osteophytes compensate for knee osteoarthritis (OA) by increasing and improving stability and increase contract surface area in knee osteoarthritis. Moreover, when PFJ osteophytes are not removed, some studies report good clinical outcomes. The issue of removing or leaving PFJ osteophytes is controversial.

The objective of this study was to compare AKP following mobile bearing UKA after removing or leaving PFJ osteophytes.

Methods: The prospective non-randomized study included 89 isolated medial osteoarthritis (OA) of knee. They were classified into 2 groups. Group (Gp)1 was removing PFJ osteophytes; consists of 44 knees. Gp2 was non-removing PFJ osteophytes: consists of 45 knees. The patients were follow up and recorded incidence of AKP and VAS for AKP at 6 weeks, 3months, 6 months, 1 year and 2 years. No patients were lost to follow up. The patellar tilt and shift were measured at 6 weeks, 3months, 6months, 1year and 2 years via skyline view radiography. The knee society scores, Oxford knee score, knee injury and osteoarthritis outcome score, forgotten joint score and Kujala scale also were recorede at 6 weeks, 3months, 6months, 1 year and 2 years.

Detailed Description

Removing and non-removing osteophyte at patellofemoral joint is controversial topic. The osteophyte may help to reduce load and improve stability of patellofemoral joint. Therefore, the purpose of this study is to compared anterior knee pain between removing and non-removing osteophyte at patellofemoral joint following medial mobile bearing unicompartmental knee arthroplasty

Study Timeline

• Study Start: 2017-01-01
• Primary Completion: 2021-05-01
• Study Completion: 2021-11-01
• Status Verified: 2022-05
• Study First Submitted: 2022-05-01
• Study First Submitted QC: 2022-05-04
• Last Update Submitted: 2022-05-04
• Study First Posted: 2022-05-10
• Last Update Posted: 2022-05-10

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 90

Inclusion Criteria

• age > 42 years old
• range of motion > 90 degrees
• flexion contracture< 15 degrees
• normal function of anterior cruciate ligament

Exclusion Criteria

• spontaneous osteonecrosis of the knee
• inflammatory joinr arthritis
• full thickness cartilage loss at lateral compartment

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
removing patellofemoral joint osteophytes	removing osteophyte at patellofemoral joint	remove osteophyte at patella, medial femoral condyle and lateral femoral condyle

Primary Outcome Measures

Name	Time	Method
Visual analogue scale for anterior knee pain	2 years	pain score 0= no pain and pain score 10= maximum pain
incidence of anterior knee pain	2 year	number of participant that had anterior knee pain