Implant Complications
A 58-year-old man presents 6 years after metal-on-polyethylene total hip arthroplasty with groin pain and swelling. He has a large femoral head (36mm) on a modular stem. Serum cobalt is 8 ppb (normal less than 1 ppb). MRI shows a fluid collection with synovitis around the hip. Intraoperatively there is black metallic debris at the head-neck junction with extensive tissue necrosis. Regarding modular taper corrosion (trunnionosis) in hip arthroplasty:
Mark each as TRUE or FALSE
Taper corrosion occurs at the head-neck (trunnion) junction of modular hip implants; it results from...
The mechanism involves fretting at the modular junction creating an oxygen-depleted crevice; this di...
Taper corrosion only occurs with metal-on-metal bearings; smaller head sizes increase taper corrosio...
Clinical presentation includes pain (groin, thigh, buttock), swelling, and audible sounds; investiga...
Revision surgery involves thorough debridement of necrotic tissue and metallic debris; component rev...
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Click T (True) or F (False) for each option