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Superior bearing dislocation in a unicompartmental total knee prosthesis
Thea De Geus1, Terence Farrell1, Eoin Kavanagh1
1Department of Radiology, Mater Misericordiae University Hospital, Dublin 7, Dublin, Ireland.
Radiology Case Reports
|January 11, 2019
Summary
Mobile bearing dislocation is a rare complication of the Oxford Unicompartmental Knee Prosthesis (OUKP). Diagnosis can be challenging on X-rays, often requiring CT scans for confirmation.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Radiology
Background:
- The Oxford Unicompartmental Knee Prosthesis (OUKP) is a common surgical solution for knee osteoarthritis affecting a single compartment.
- Mobile bearing dislocation is an infrequent but documented complication associated with the OUKP.
Observation:
- Patients with OUKP dislocation typically experience significant pain and limited knee mobility.
- Radiographic assessment of OUKP can be complex due to the prosthesis components and common issues.
- The radiolucent nature of the mobile bearing, identifiable only by radiopaque markers, can lead to missed diagnoses on plain radiographs.
Findings:
- Dislocation of the mobile bearing in OUKP is an uncommon complication.
- Plain radiographs may not adequately reveal bearing dislocation due to its radiolucent material.
- Computed tomography (CT) scans are often necessary for definitive diagnosis of OUKP complications.
Implications:
- Accurate radiological interpretation is crucial for identifying OUKP complications.
- Further imaging, such as CT, may be required for proper evaluation.
- Improvements in prosthesis design and surgical methods could potentially decrease the incidence of bearing dislocation.
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