An irreducible posterolateral knee dislocation: diagnosis, arthroscopic view, and treatment

摘要

Irreducible knee dislocation is a rare orthopedic emergency, which accounts for approximately 4% of all knee dislocations, and the classical "dimple sign" or "pucker sign" on physical examination is presented as a specific feature that injured medial structure is invaginated into joint space, together with the prominence of the medial femoral condyle. Here, we reported a 38-year-old man with irreducible posterolateral knee dislocation and neural compromise. Close reduction failed in the local hospital. Physical examination and radiograph assessment indicated the entrapment of torn medial capsuloligamentous structure, which was later confirmed by arthroscopy. Urgent open reduction and reconstruction were performed in a single stage.