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Extensive disruption to ligamentous structures laterally in the knee as well as post operative changes. The common peroneal nerve is susceptible to injury laterally in the knee especially as it winds around the neck of the fibula. Note typical denervation changes to muscle supplied by both the superficial and deep branches of the nerve (i.e. anterior compartment of the leg) characterized by oedema (T2 brightening) as well as atrophy and early fatty replacement indicating that the denervation has been present for some time (i.e. weeks to months).