The basis for the articular (unified) theory for the formation of intraneural ganglion cysts is a capsular disruption through which joint (cyst) fluid egresses into the articular branch and then a parent nerve (Spinner et al., 2003). Trauma has been associated with intraneural ganglion cysts. A recent meta-analysis revealed trauma being associated with intraneural ganglion cysts in 12% of cases (Desy and Spinner, 2014). Our group has described the pathoanatomy by which direct and indirect trauma may give rise to the most common form, fibular (peroneal), and its rarer corollary, tibial intraneural ganglion cysts, both derived from the superior tibiofibular joint (STFJ) (Lalezari et al., 2012; Spinner et al., 2012a,b;Cesmebasi et al., 2014). In direct trauma, there would be a force generated near the proximal leg/knee region that would affect the STFJ (Ogden, 1972(Ogden, , 1974Sekiya and Kuhn, 2003); in indirect trauma, forces would be translated from the ankle region (such as in ankle sprains or fracture) via the interosseous membrane to the proximal leg (Cesmebasi et al., 2014). A direct causeeffect relationship between traumatic injury and intraneural ganglion cyst formation has yet to be definitively established.A 20-year-old man tripped off a curb and fell on his left knee. He sustained a multi-ligamentous knee injury as a result from a knee dislocation. He presented to an emergency room with exquisite pain and foot drop from a common fibular nerve (CFN) palsy and was discharged after negative plain radiographs were obtained. Several days later, he noted increasing pain and was found to have elevated leg compartment pressures for which he underwent four compartment fasciotomies. MRI performed 7 days after the initial injury revealed a posterolateral corner injury involving disruption of the fibular collateral and posterior cruciate ligaments, posterolateral capsule, and the musculotendinous junction of the popliteus, lateral meniscus, and medial patellofemoral ligament. There was edema and thickening of the CFN extending from the fibular neck to a point just distal to the sciatic nerve bifurcation (Figs. 1A-1C). He was referred to colleagues at our institution for definitive care of the multi-ligament injury and the CFN injury. Repeat MRI 3 months after the injury confirmed the previous findings referable to the ligamentous injury. The CFN was markedly enlarged in the popliteal fossa. There was anterior and lateral compartment musculature atrophy consistent with denervation. Electromyography (EMG) confirmed a complete common fibular neuropathy. He underwent staged reconstruction over the course of 9 months: (1) exploration and nerve grafting of the left CFN with 2 cable grafts (9 cm in length) using the superficial fibular nerve; (2) high tibial wedge osteotomy with allograft bone graft; and (3) multi-ligament knee reconstruction. At last follow-up, 15 months post nerve grafting, he had no return of neurologic function but had regained a stable knee. It was recommended he undergo tendon transfer for persisten...