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A 64-year-old woman with a history of left-sided cruciate-sparing total knee arthroplasty
(TKA) presented to the emergency department after developing acute onset of pain in
her knee. She stated that after standing up, she felt a “pop” followed by pain. The
physical examination revealed laxity of the knee posteriorly compared with the contralateral
knee. There were no external signs of deformity or swelling and neurovascular status
was intact. Radiographs were obtained (Figure 1).
Figure 1Plain radiographs (anteroposterior and lateral views) of the knee demonstrating malalignment
of the femoral component that is posteriorly and laterally subluxed relative to the
femoral component.
