Author: Alexandra Murray, OMSIV
Ohio University Heritage College of Osteopathic Medicine
Originally Published: Modern Resident, February-March 2015
Classic medical conditions that are associated with “pain out of proportion to exam” include compartment syndrome, necrotizing fasciitis and mesenteric ischemia.[1-3] However, another condition that can present with excruciating pain, despite underwhelming exam findings, is a Lisfranc injury.[4-6] Lisfranc injuries encompass a broad spectrum of injuries to the tarsometatarsal (TMT) joints that separate the mid-foot and forefoot. These injuries can be purely ligamentous or involve the osseous and articular structures, resulting in dislocation and/or fracture.[4-6]
Lisfranc injuries comprise only 0.2% of all fractures and can result from direct or indirect trauma. Most cases are associated with high-energy motor vehicle accidents (i.e., ATV accidents) where there is a crush injury to the foot. Indirect trauma from a twisting injury combined with axial loading of the foot can also result in plantar displacement (i.e., sports injury or falling from a step). Most Lisfranc injuries are closed without obvious deformity, making the injury difficult to diagnosis.
Patients typically present with a painful, swollen mid-foot with possible ecchymosis to the plantar aspect.[5,6] Weight bearing is not tolerated, but the patient may have relatively minor pain at rest. Side to side compression of the mid-foot should be painful and may be needed to elicit the diagnosis.[4-6] X-rays of the foot should include three views and, if possible, these images should be taken while weight bearing.[4-6] Non-weight bearing radiographs may not demonstrate an appreciable displacement of the osseous structures, causing the injury to be initially overlooked in up to 50% of cases. Dislocations and fractures are commonly found in combination. An avulsion fracture of the base of the second metatarsal or medial cuneiform, referred to as a “fleck sign,” can often be seen with Lisfranc injuries.[4-6]
Treatment of all Lisfranc injuries requires urgent orthopedic evaluation and follow up, whether treated conservatively or surgically.[4-6] Without treatment, many Lisfranc injuries progress to post-traumatic arthritis, worsening instability and deformity.[4-6] These injuries need anatomical reduction to improve outcome, which can generally only be accomplished with surgery.[4-6] Patients should be placed in a non-weight bearing cast until orthopedic evaluation can be performed.
Lisfranc injuries comprise a spectrum of injuries to the tarsometatarsal joints that can present with foot pain out of proportion to exam.[4-6] These injuries may appear relatively benign; however, it is important to keep in mind that even significant injuries can reduce spontaneously, thereby hiding the initial deformity. Therefore, it is important that the clinician keep a high index of suspicion for this type of injury in any patient with pain and swelling over the mid-foot.
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