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Objective: To develop a new classification of acromion based on the subacromial impingement theory and the Rockwood tilt view. And explore the application value of the new classification in the diagnosis and treatment of rotator cuff tear., Methods: The clinical data of 101 patients underwent shoulder arthroscopic surgery for impingement syndrome or rotator cuff tear from January to December 2017 were retrospectively analyzed. There were 34 males and 67 females, aged from 34 to 76 years with an average of (56.31±9.63) years old, course of disease from 2 to 12 months with average of 6 months. Preoperative radiographs of the routine anteroposterior view, Rockwood tilt view and the supraspinatus outlet view were obtained. Based on the subacromial impingement theory and Rockwood radiographs, the morphology of the acromion can be divided into three types:typeⅠ(flat type), typeⅡ(bump type), and type Ⅲ (impingement type). Two observers classified 101 shoulder Rockwood radiographs according to the new classification method and the supraspinatus Outlet radiographs according to the traditional acromial morphological classification method. Supraspinatus tendon injuries were classified into no tear, partial-thickness tear, and full-thickness tear according to the arthroscopic findings. Concordance test (Kappa value) between the inter-observer and intra-observer was carried out for the new classification method and the traditional classification method respectively. The rank sum test was used to compare the mean acromiohumeral distance(AHD) of the three acromion forms in the new acromion classification method. Spearman rank correlation test and Gamma method were used to analyze the correlation between the new acromion classification method and the degree of supraspinatus tendon tear., Results: The inter-observer consistency analysis of the new classification system was significantly better than that of the traditional classification (0.827 vs 0.278), the intra-observer consistency analysis of the new classification system were also significantly better than that of the traditional classification (0.921 vs 0.448, 0.890 vs 0.539). There was no statistical significance in the AHD among three types of the new classification( H =2.186, P >0.05). In all 101 patients, the highest proportion of impingement type acromion was 45.5% (46 cases), followed by bump type acromion was 36.6% (37 cases), and flat type acromion was 17.8% (18 cases). The incidence of supraspinatus tendon tear in the patients with impingement type acromion was significantly higher than that of the other two types of acromion, there was a spearman rank correlation between the new acromion type and the degree of the supraspinatus tendon tear( rs =0.719, P <0.001)., Conclusion: Rockwood radiographs of the shoulder can well display the anterolateral osteophytes of the acromion. The new acromion classification method based on Rockwood radiographs has high reliability and good reproducibility, in which impingement type of acromion is closely related to supraspinatus tendon tear. Compared with the traditional classification and AHD, the new classification method has more diagnostic value than for rotator cuff injury.

Objective: To explore the feasibility and clinical effects of arthroscopic treatment for the calcific tendinitis at soft tissues around hip., Methods: A total of 16 patients diagnosed as the calcific tendinitis at soft tissues around hip from May 2013 to July 2018 were retrospectively analyzed. All the 16 patients received arthroscopic procedures. There were 10 males and 6 females with an average age of 35 to 63 (44.50±6.67) years old and 9 left hips, 6 right hips were involved. The course of disease were 1 to 8(3.18±1.97) days. Clinical effects were evaluated with visual analogue scale(VAS), modified Harris hip scores (HHS), nonarthritic hip score (NAHS) and imaging examinations before operation, 1 day after operation and the final follow-up., Results: All 16 patients successfully finished the arthroscopic procedures in 0.5 to 1.2 (0.75±0.21) hours. Primary healing of incision were obtained without any complications of infection, wound hematocele and neurovascular injury. All 16 patients received an average postoperative follow-up of 6 to 12 (9.6±2.3) months. Before operation, the VAS were 7.88±0.72, modified HHS were 29.25±3.23, NAHS were 27.42±3.08. The 1st day postoperative VAS were 2.19±0.66, modified HHS were 82.56± 5.64, NAHS were 82.11±2.94, all the difference were statistically significant between before and 1 day after operation ( P < 0.05). At the final follow-up, the VAS were 0.38±0.50, modified HHS were 94.31±2.82, NAHS were 94.84±2.85, all the scores were improved significantly compared to that before operation ( P <0.05). At final follow-up, there was no recurrence and the calcification disappeared in all patients, there was one patient feel sourness around the hip., Conclusion: Arthroscopic treatment for the calcific tendinitis at soft tissues around hip is effective.It has advantages of minimal invasive, rapid pain relief, rapid hip joint function recovery and definite clinical effects.

Objective: To compare technique and clinical effect of arthroscopic and conventional sectional therapy for the treatment of ischial tuberosity cyst., Methods: From May 2014 and September 2016, 49 patients with symptomatic ischial tuberosity cyst were randomized divided into arthroscopic group and conventional section group by envelope method. There were 24 patients in arthroscopic group, including 16 males and 8 females aged from 42 to 81years old with an average age of (64.1±9.3) years old;the courses of disease ranged from 2 to 36 months with an average of (17.0±9.1) months;treated with removing cyst wall under arthroscopic and build artificial lacuna around cyst. There were 25 patients in conventional section group, including 11 males and 14 females aged from 47 to 79 years old with an average of (61.2±10.6) years old; the courses of disease ranged from 4 to 36 months with an average of (17.5±8.5) months;treated with cutting off lump with transverse incision. Operative time, blood loss, fluid volume, hospital stays and postoperative complication were observed and compared, VAS score were applied to evaluate pain degree., Results: Forty-nine patients were followed up from 6 to 18 months with an average of (11.3±3.3) months. In conventional group, 2 patients occurred incision infection, 1 case reoccurred. All patients in arthroscopic group were healed at stage I. Operative time, blood loss, fluid volume, and hospital stays in arthroscopic group were (54.7±7.7) min, (20.8±3.5) ml, (20.3±5.6) ml, (2.8±0.6) d respectively and better than that of conventional group(71.8±8.8) min, (67.3±12.0) ml, (103.6±20.3) ml, (7.8±2.9) d. Postoperative VAS score in arthroscopic group on the first day, seventh days and first month were 2.6±0.7, 0.5±0.6, 0.3±0.5, and significantly lower than that of conventional group 6.0±0.7, 3.0±1.0, 1.1±1.0 respectively( P <0.05). There were no statistical difference in postoperative complications between two groups( P >0.05)., Conclusions: Compared with conventional group, arthroscopic for ischial tuberosity cyst has advantages of minimal invasive, less blood loss during perioperative period, less pain degree after surgery, safety and rapid recovery. But arthroscopic skills are needed for surgeons. It should be recommended in clinical practice., Competing Interests: The authors of this article and the planning committee members and staff have no relevant financial relationships with commercial interests to disclose., (Copyright© 2018 by the China Journal of Orthopaedics and Traumatology Press.)