The gluteus medius allows hip abduction and stabilization of the pelvis when walking. A rupture of the gluteus medius tendon is associated with lateral hip pain, weakness, a positive Trendelenburg sign, and a limp. Diagnosis is confirmed by ultrasound or MRI. In the case of a degenerative lesion, treatment is based on activity modification, physiotherapy, and injections. If conservative treatment fails, or in the case of a traumatic injury in a young patient, tendon repair surgery may be performed. Open and arthroscopic surgeries give good results with improved pain and strength, improved gait, and a low re-rupture rate. Tendon transfer may be considered in cases of re-rupture or irreparable tendon.