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Total knee dislocation due to rotatory malalignment of tibial component: a case report
Clinical Orthopaedics and Related Research
|March 1, 1980
Summary
Rotatory malposition of the tibial component in total knee replacement can cause dislocation. Proper alignment, avoiding posterior tibia edge use, and recognizing tibial rotation differences prevent this common complication.
Area of Science:
- Orthopedic surgery
- Biomechanical engineering
Background:
- Total knee replacement (TKR) is a common procedure for end-stage knee arthritis.
- Tibial component malrotation is a known complication that can affect TKR outcomes.
Observation:
- Dislocation of a total condylar knee replacement was identified as a consequence of tibial component rotatory malposition.
- Evaluation involved both open surgical assessment and laboratory analysis.
Findings:
- Prevention strategies include aligning the tibial component with the tibial tubercle and avoiding posterior tibial edge alignment.
- Recognizing the "contradictory rotation" of the tibia during flexion is crucial.
- The discrepancy between external tibial rotation during surgery and internal rotation during gait (screw-home mechanism) increases dislocation risk.
Implications:
- Rotatory malposition can lead to patellar subluxation, malalignment, pain, and loosening of prosthetic components.
- Abnormal loading on the tibial component can result in loosening.
- Correcting tibial component rotation is essential for TKR stability and longevity.