Traumatic posterior hip dislocation should be reduced emergently, but diagnosis could be delayed in a patient with head trauma or in developing countries. We have experienced neglected posterior hip dislocation for three months in a crutch-walking patient who had ipsilateral tibia fracture and alert mentality. Open reduction followed by six-weeks skeletal traction was performed. At one year follow-up, the reduced hip showed good range of motion with no evidence of avascular necrosis.