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A 60-year-old male patient presented to the ED with a painful deformity of the left knee following a motor vehicle accident. He was unable to actively perform knee flexion and extension. Physical examination showed a swollen knee with fixed valgus-flexed deformation. The appearance of the knee joint revealed a puckered skin with a recession at the medial joint line (figure 1). The patient denied sensational loss or numbness of his distal limb with intact pulsation in distal limb dorsalis pedis and posterior tibial …
Contributors Both authors contributed equally to this manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, conduct, reporting or dissemination plans of this research.
Provenance and peer review Not commissioned; internally peer reviewed.