The rotator cuff is a complex composed of four tendons: the supraspinatus and infraspinatus muscles. Nowadays, more and more people pay attention to the injury and pain of the shoulder joint. There are many reasons for shoulder joint pain, among which rotator cuff tear is the most common injury. For patients with clinical symptoms of acute rotator cuff injury or who do not respond to non-surgical treatment after three months of injury, surgery is required as soon as possible. However, according to domestic and foreign studies, the quality and integrity of postoperative tendon healing are still not ideal. Due to the influence of age, injury time, injury degree, and treatment method, postoperative complications such as pain, limited movement, and retear are still high. Rotator cuff tears surgically repaired the tending-osseous transitional zone. Still, the previously bone-tendon solid tissue connection was replaced by a relatively poor fibrovascular scar, resulting in poor mechanical properties of the repaired tendon after surgery. Nowadays, surgery combined with biological means has made significant progress in promoting tissue healing after rotator cuff repair surgery. In recent years, PRP has been widely applied in various orthopedic diseases, and the effectiveness of PRP in treating orthopedic conditions has been proved in domestic and foreign studies. The application of PRP in rotator cuff injury is still a hot research topic. Still, there is no consensus on PRP's effectiveness in treating rotator cuff injury. Therefore, whether rotator cuff repair combined with PRP positively affects the healing of the rotator cuff and the reduction of postoperative complications remains doubtful.

To analyze the curative effect of rotator cuff repair combined with the injection of platelet-rich plasma into footprints.

A retrospective study was conducted on 40 patients with rotator cuff tears who underwent arthroscopic surgery in the First Hospital of Qinhuangdao from March 2021 to March 2022. All patients treated with PRP during the operation were divided into the PRP group (n=20) and the control group without PRP treatment (n=20). Various postoperative scores of the two groups were statistically analyzed using the SPSS 26.0 software, and postoperative evaluation was performed using MRI and musculoskeletal ultrasound.

Forty patients were followed up for one year. All kinds of scores of the two groups were better than those before surgery. The VAS score of 6 months after surgery (Z=-2.071, P < 0.05), Constant score of 3 months after surgery (t=2.827, P < 0.05), ASES score of 3 months after surgery (t=2.210, P < 0.05) were significantly increased in PRP group. The difference between the two groups was statistically significant. The rate of retear between the two groups was not statistically significant. MRI and musculoskeletal ultrasonography of shoulder joints three months after surgery indicated that rotator cuff healing improved and blood flow increased in the PRP group.

Compared with rotator cuff repair alone, rotator cuff repair combined with platelet-rich injection in the footprint can improve shoulder joint pain and function in the short term after surgery and promote postoperative healing