Early tibial tray failure of a Duracon knee with retrieval analysis.
We report a case of early tibial tray fracture of a Duracon knee prosthesis. Aside from the clinical, radiographic, and gross analysis of the failed prosthesis, we also performed analysis on the retrieved polyethylene component and the fractured tibial baseplate. In the analyses, we noted significant femoral component malalignment, uneven tray cementation, and inherent metallurgical weakness. It appears that the high compressive load on the medial tray resulted in bending fatigue failure. To avoid this complication, it is important to restore the normal alignment of the knee joint and use a polyethylene insert of higher conformity, at least 6 mm thick.
Ho
Ta-Feng
TF
Department of Orthopaedics Surgery, Show Chwan Memorial Hospital, Changhua City, Changhua County, Taiwan.
Tsai
Ruey-Yug
RY
Lee
Pei-Yuan
PY
Ku
Ming-Chou
MC
D000368:Aged; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D007720:Knee Prosthesis / Q000009:adverse effects*; D008855:Microscopy, Electron, Scanning; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013499:Surface Properties