Description

According to the different surgical intervention methods, the cases finally included in the study were divided into minimally invasive surgery group and MRN-guided minimally invasive surgery group according to the randomization method. It is expected that the number of cases finally included in the study in both groups will be 22 cases.

Firstly, the age and sex of the two groups of patients included in the study were recorded respectively, and the moderate and severe classification was carried out according to the Zhao 's classification system. The experimental group and the control group were examined by pelvic X-ray, magnetic resonance and ultrasound before operation. After improving the relevant preoperative examination and excluding surgical contraindications, the intervention measures of the experimental group were to analyze the relationship between the shape of the contracture zone, the distance between the sciatic nerve and the contracture zone, and the external rotation angle according to the preoperative MRN manifestations of the patients, and to design the individualized surgical approach according to the imaging manifestations. MRN-assisted minimally invasive release ; in the control group, preoperative magnetic resonance imaging was only used to assist in the diagnosis and evaluation of gluteal muscle contracture, and the results of magnetic resonance imaging were not used to assist in the design of surgical approach. In the control group, non-MRN-assisted minimally invasive release was performed. For patients, they all underwent magnetic resonance imaging before surgery, and all underwent minimally invasive surgery. However, the design process of the specific surgical approach is not clear, so it is a single-blind design for patients. All the operations were completed by two senior doctors of our research group. The data of postoperative follow-up were recorded, and the conclusion was drawn by statistical analysis.

Intraoperative research indicators include : incision length, operation duration, intraoperative blood loss, first time to get out of bed, pain score, etc.

Postoperative follow-up study indicators included : subjective and objective functional rating scales ( hip flexion and adduction activity, leg squat, cross-leg test, Ober sign, pain in activity, claudication in walking ), patient appearance satisfaction, complications ( wound infection, fat liquefaction, neurovascular injury, incision hematoma formation, etc. ).