Patellofemoral Pain After Unicondylar Knee Arthroplasty

Overview

Unicondylar knee arthroplasty (UKA) is a proven procedure in patients suffering from unicompartmental knee osteoarthritis. Two different types of UKA design are available – both with different pros and cons. The so-called 'mobile-bearing UKA' requires the removal of an additional amount of cartilage and bone close to the implantat. It is unclear whether this is of clinical relevance. We speculate that the amount of cartilage/bone removal is related to the clinical outcome of the UKA-surgery. In patients receiving a mobile-bearing UKA that amount of cartilage/bone removal is measured during the surgery. The clinical success of the procedure will be determined with certain knee questionnaires (Kujala & KOOS)preoperatively, 3 months postoperatively, 6 months postoperatively and 1 year postoperatively. Additionally, the so-called bone-remodelling around that area of resected cartilage and bone will be measured (SPECT-CT) postoperatively. The three variables (removed amount of cartilage/bone; clinical success with regard to the questionnaires; bone remodelling) are then analyzed with statistical methods to find out potential assoziations among them.

Study Type

  • Study Type: Observational
  • Study Design
    • Time Perspective: Prospective
  • Study Primary Completion Date: December 2014

Interventions

  • Procedure: mobile-bearing unicondylar knee arthroplasty
    • mobile-bearing unicondylar knee arthroplasty

Arms, Groups and Cohorts

  • mb-UKA
    • Patients with unicondylar osteoarthritis of the knee

Clinical Trial Outcome Measures

Primary Measures

  • Size of anterior femoral notch
    • Time Frame: day 0
    • Required cartilage / bone removal adjacent to the femoral implant
  • Kujala Score changes
    • Time Frame: -1 days, 3 months, 6 months, 1 year
  • KOOS questionnaire changes
    • Time Frame: -1 days, 3 months, 6 months, 1 year
  • Radionuclide tracer uptake at the surgically created notch
    • Time Frame: 6 months

Participating in This Clinical Trial

Inclusion Criteria

  • osteoarthritis or osteonecrosis in the medial or lateral tibiofemoral compartment Exclusion Criteria:

  • failed upper tibial osteotomy – insufficiency of the collateral or anterior cruciate ligaments – a fixed varus or valgus deformity (not passively correctable) above 15° – a flexion deformity greater than 15° – rheumatoid arthritis

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: 99 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Medical University Innsbruck
  • Provider of Information About this Clinical Study
    • Principal Investigator: Michael Liebensteiner, MD, PhD – Medical University Innsbruck

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