Two pegs are better than one: rare mode of femoral component failure in unicompartmental arthroplasty requiring revision to total knee arthroplasty

Two pegs are better than one: rare mode of femoral component failure in unicompartmental arthroplasty requiring revision to total knee arthroplasty

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Femoral component fracture is a rare complication in unicompartmental knee arthroplasty, especially in cemented prostheses.We present a 75-year-old man who presented with a fractured single-peg Hand Balm Vanguard component 9 years postoperatively.He was revised to a total knee arthroplasty with an excellent functional outcome at 1 year.The components were additionally examined at an outside biomechanical engineering laboratory.Theories as to the cause of the component fracture include aseptic loosening due to Protein a thin anterior cement mantle and the single-peg Oxford design.