The short-term follow-up results of the modified posterolateral approach minimally invasive total hip arthroplasty with the characteristics of CFP prosthesis combined with the preservation of partial external rotation muscle group were discussed and analyzed.

Retrospective analysis was done in the Department of Orthopaedics, the Third Hospital of Hebei Medical University from October 2017 to February 2018, patients diagnosed with ischemic femoral head necrosis, hip osteoarthritis, subtrochanteric femoral neck fracture, femoral neck fracture Femoral head necrosis, congenital hip dysplasia with traumatic arthritis were treated with modified posterior approach minimally invasive total hip arthroplasty with CFP prosthesis, excluding history of hip purulent infection, history of tuberculous hip arthritis There were 46 cases (46 hips) with head and neck and basal femoral neck fractures, 20 males and 26 females, aged 60-81 years, the mean age was (72±8) years old. The surgical time, length of incision, amount of bleeding, length of hospital stay, postoperative complications, and imaging evaluation were recorded. The improvement of pain before and after hip replacement and the recovery of hip function were compared by one-way analysis of variance.

All the 46 cases were followed up for (11.5±0.8) months. The time of operation, length of incision, amount of bleeding, and length of hospital stay were (77±15) min, (8.5±1.3) cm, (279.5±65.1) ml, (7.1±0.9) d. The positive rate of Trendelenburg at the last follow-up was 2.2%(1/23). The hip Harris scores before and after 1 d, 4 d, 7 d, 1 m, 3 m, 6 m, and the last follow-up were (52.8±15.9), (35.5±7.7), (63.8±15.2), (74.1±8.5), (80.0±4.7), (88.9±5.1), (92.5±4.9), (93.3±4.7) (F=112.5, P<0.01). Preoperative, postoperative 1 d, 4 d, 7 d, In January, March, June, and the last follow-up, the Barthel index averaged were (87.6±15.8), (34.1±8.2), (68.7±9.6), (76.3±6.6), (84.6±6.9), and (90.9±6.9), (95.7±6.1), (95.9±6.7), (F=142.0, P<0.01). The visual analogue scale (VAS) scores of preoperative, postoperative 1 d, 4 d, 7 d, 1 m, 3 m, 6 m, and last follow-up were (6.6±1.5), (4.9±1.2), and (3.5±1.0), (2.4±0.8), (1.6±0.6), (1.1±0.6), (0.6±0.5), (0.6±1.3), (F=160.8, P<0.01). Standard posterior pelvis, anterior posterior femur on the replacement side, orthogonal splicing of lower limbs X-ray after surgery were achieved, difference in length of the lower limbs was (5.2±2.8) mm, acetabular abduction angle was (45.0±5.4)°, difference in bilateral femoral eccentricity was (4.3±2.1) mm and the anteversion angle of the acetabulum was (18.9±6.4)°. There were no prosthesis dislocation, periprosthetic fracture, wound infection, sciatic nerve injury, deep vein thrombosis, cerebral embolism and pulmonary embolism occurred.

Combined with the characteristics of CFP prosthesis, the modified posterior approach minimally invasive total hip arthroplasty has small trauma, can retain part of the external rotation muscle group, improve postoperative pain and accelerate functional recovery. It is a safe and feasible minimally invasive total hip arthroplasty. technology.