Abstract : [ Objective ] : To investigate the surgical technique and preliminary clinical effect of modified minimally invasive anterolateral approach ( Orthopadische Chirurgie Munchen, OCM ) in total hip arthroplasty.[ Methods ]: From January 2021 to January 2023, the clinical data of 32 patients undergoing total hip arthroplasty with modified minimally invasive anterolateral approach were retrospectively analyzed. The minimally invasive anterolateral approach is located behind the anterior superior iliac spine to the leading edge of the greater trochanter. The length of the incision is 6-9cm. It is separated between the gluteus medius muscle and the tensor fascia lata, and the joint capsule is exposed. The modified minimally invasive anterolateral approach is located 4-6cm posterior to the anterior superior iliac spine, and a 6-9cm incision is made to the anterior edge of the greater trochanter of the femur, which is 30 ° with the longitudinal axis of the femur to expose the joint capsule.[ Results ]: All patients successfully completed the operation and were followed up for 1-2 years, with an average follow-up time of 1.5 years. The average operation time was ( 46 ± 13 ) min, the average incision length was ( 8.50 ± 1.29 ) cm, and the average intraoperative blood loss was ( 187.57 ± 125.4 ) ml. There were 1 case of femoral greater trochanter fracture and 1 case of rotation center upward. No complications such as dislocation, incision infection and lateral femoral cutaneous nerve palsy occurred. The VAS score at the last follow-up was ( 1.4 ± 0.3 ) points ; the Harris score was ( 86.8 ± 3.1 ) points. The range of motion ( ROM ) of hip joint was ( 130.3 ± 7.1 ) °. In terms of imaging, all patients had good prosthesis position at the last follow-up.[ Conclusion ] : The modified minimally invasive anterolateral approach of total hip arthroplasty has the advantages of short operation time, less bleeding and fewer complications. The clinical efficacy is satisfactory. It is a safe and effective surgical approach.