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Anterior dislocation after a posterior stabilized total knee arthroplasty
Su Chan Lee1, Kwang Am Jung, Chang Hyun Nam
1Department of Orthopaedic Surgery, Joint and Arthritis Research Laboratory, Himchan Hospital, Seoul, Korea.
The Journal of Arthroplasty
|June 7, 2011
Summary
Anterior dislocation of a posterior stabilized total knee arthroplasty is rare. This case report details an unusual anterior dislocation in a patient with rheumatoid arthritis, highlighting a unique complication of total knee replacement.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Total knee arthroplasty (TKA) is a common procedure to manage severe knee joint damage.
- Posterior stabilized (PS) TKA designs are frequently used, featuring a cam-mechanism to enhance stability.
- Dislocation is a rare but severe complication following TKA.
Observation:
- Literature typically reports posterior dislocations in PS TKA due to cam-jump.
- This report presents an atypical case of anterior dislocation in a PS TKA.
Findings:
- The anterior dislocation occurred in an 11-year-old PS TKA implant in a 55-year-old woman with rheumatoid arthritis.
- The dislocation event followed a simple slip, suggesting potential contributing factors beyond typical cam-jump mechanisms.
Implications:
- This case underscores the possibility of anterior dislocation in PS TKA, challenging previous assumptions.
- Further investigation into the biomechanics and risk factors for anterior dislocation in PS TKA is warranted.
- Understanding rare complications is crucial for improving TKA implant design and patient outcomes.