Prosthetic joint material may undergo excessive wear with release of plastic or metal debris. In severe cases excessive wear can result in sterile osteolysis or mechanical failure.
Risk factors for excessive wear:
(1) excessive use
(2) prolonged use
(3) obesity or other excessive load
(4) malalignment at time of placement
(5) acquired malalignment
(5a) trauma
(5b) infection
(5c) sterile osteolysis
(5d) osteoporosis
(6) defective or inappropriate joint material
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