Open Ankle Dislocation without Associated Malleolar Fracture on a Trampoline. A Case Report.

Dislocation of the ankle without fracture is very uncommon. There are only few reports in the international literature. Up to now approximately 80 cases are published. The risk of hyperflexion and -inversion of the ankle seems high on a trampoline. A multiple of the jumper's body-weight projects delayed on the upper ankle joint while dipping in the trampoline-sheet. Reduction should be performed as fast as possible to ensure a good clinical outcome. Imaging via MRI and CT scan allows a detailed evaluation of the injury severity. The decision for further treatment should be based on the findings in the MRI and CT scans. Reconstructing the medial and lateral capsular ligaments can be necessary. With a consequent treatment algorithm a good functional outcome can be achieved. In our case we documented a post-traumatic AOFAS score of 87/100 six months after the injury without an instability of the upper or lower ankle joint. Propioreceptive reflex and pronator training as well as taping seem to be useful before and during trampoline sports.