Pure acute medial subtalar dislocation without any fractures is very rare and hardly reported in the literature, it represents approximately 1% of all dislocations. This injury is defined as simultaneous dislocation of both thetal on avicular and the talocal caneal joints without a major fracture. It is not commonly seen as a sports injury because it requires transfer of a high energy. Optimal management of subtalar dislocations is immediate closed reduction with procedural sedation. We report a very rare case of a closed subtalar dislocation without any related fractures. A 22 year old male was admitted to the emergency department with pain and ankle deformity following an inversion injury during a basketball game. In his physical examination, the left foot was displaced medially and talus was prominent dorso laterally (A). However, there was not any neurovascular compromise. The X-ray examination revealed medial subtalar dislocation without associated fractures (B, C). A computed tomography scan with 3D reconstruction confirmed the isolated dislocation. Under procedural sedation the reduction was successfully performed by an external maneuver (D). The ankle was immobilized in a short leg cast for 8 weeks. At 24 months follow-up, the patient was autonomous and active without instability at the left ankle.