Bone defects during TKA

Bone defects are commonly encountered in revision total knee arthroplasty (TKA) and can affect implant alignment and the bone-implant interface. Bone loss can be caused by stress shielding, osteolysis, infection, and mechanical motion generated from a loose implant. It may be iatrogenic at the time of implant removal. In revision TKA bone defects must be addressed to restore the joint line and provide structural support for the new implant. There is no consensus on the classification and management protocol. An ideal classification system should be easy to use, enable accurate evaluation of bone loss for preoperative planning, facilitate comparison of results among surgeons, predict outcomes, and provide guidelines on treatment and rehabilitation.

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