Objective:To investigate the clinical efficacy of Dog-Bone double button in the treatment of acute acromioclavicular dislocation under shoulder arthroscopy.Methods:A retrospective analysis was conducted of the 20 patients with acute acromioclavicular dislocation who had been treated at Department of Sports Medicine, Northern Jiangsu People's Hospital of Jiangsu Province from November 2018 to December 2020 by Dog-Bone double button under shoulder arthroscopy. They were 11 males and 9 females, aged from 31 to 63 years. Recorded were their visual analogue scale (VAS), Constant-Murley shoulder function score and range of shoulder anteflexion at preoperation and the last follow-up, as well as complications and the X-ray parameters at one month postoperation and the last follow-up [including coracoclavicular distance (CCD), distance between the upper and lower Dog-Bone titanium plates (DDD), angle between the coracoid process tunnel and the tangent line of the superior clavicle (CTCA), and widths of the clavicle tunnel and the coracoid process tunnel].Results:The 20 patients were followed up for 6 to 12 months (average, 10.5 months). Their preoperative VAS score, Constant score, and range of shoulder anteflexion were 3.0 (3.0, 4.0), 57.0 (54.3, 61.5) and 130° (110°, 140°), which were significantly improved to 0 (0, 0.8), 90.0 (86.5, 91.0) and 170° (170°, 180°) at the last follow-up ( P<0.05). Their CCD, DDD, CTCA, and widths of the clavicle tunnel and the coracoid process at one month postoperation were (5.0±1.0) mm, (32.4±3.5) mm, 91.7° (88.5°, 104.9°), 3.0 (3.0, 3.0) mm and 3.0 (3.0, 3.0) mm, which were significantly improved to (6.3±1.3) mm, (32.8±3.7) mm, 84.8° (81.8°, 92.0°), 3.5 (3.4, 3.6) mm and 3.2 (3.1, 3.3) mm with the exception of DDD at one month postoperation ( P<0.05). The last follow-up observed postoperative reduction loss in only one patient. Conclusion:For acute acromioclavicular joint dislocation, the Dog-Bone fixation technique under shoulder arthroscopy can lead to fine surgical efficacy and patient satisfaction, because it has advantages of limited trauma, good functional recovery of the shoulder, and effective prevention of reduction loss.

Background and Objectives: This study aims to clarify the systems underlying regulation and regulatory roles of hydrogen combined with 5-Aza in the myogenic differentiation of adipose mesenchymal stem cells (ADSCs). Methods: and Results: In this study, ADSCs acted as an in vitro myogenic differentiating mode. First, the Alamar blue Staining and mitochondrial tracer technique were used to verify whether hydrogen combined with 5-Aza could promote cell proliferation. In addition, this study assessed myogenic differentiating markers (e.g., Myogenin, Mhc and Myod protein expressions) based on the Western blotting assay, analysis on cellular morphological characteristics (e.g., Myotube number, length, diameter and maturation index), RT-PCR (Myod, Myogenin and Mhc mRNA expression) and Immunofluorescence analysis (Desmin, Myosin and β-actin protein expression). Finally, to verify the mechanism of myogenic differentiation of hydrogen-bound 5-Aza, we performed bioinformatics analysis and Western blot to detect the expression of p-P38 protein. Hydrogen combined with 5-Aza significantly enhanced the proliferation and myogenic differentiation of ADSCs in vitro by increasing the number of single-cell mitochondria and upregulating the expression of myogenic biomarkers such as Myod, Mhc and myotube formation. The expressions of p-P38 was up-regulated by hydrogen combined with 5-Aza. The differentiating ability was suppressed when the cells were cultivated in combination with SB203580 (p38 MAPK signal pathway inhibitor). Conclusions Hydrogen alleviates the cytotoxicity of 5-Aza and synergistically promotes the myogenic differentiation capacity of adipose stem cells via the p38 MAPK pathway. Thus, the mentioned results present insights into myogenic differentiation and are likely to generate one potential alternative strategy for skeletal muscle related diseases.

Objective:To compare the clinical efficacy between reservation and sacrifice of remnants in the footprint area in arthroscopic repair of rotator cuff tear.Methods:A retrospective study was conducted to analyze the clinical data of 32 patients with rotator cuff tear plus remnants in the footprint area (2 cm < tear size <5 cm) who had been admitted to Department of Sports Medicine, The People's Hospital of Northern Jiangsu from May 2020 to July 2021. The patients were divided into 2 groups according to reservation or sacrifice of remnants in the footprint area in arthroscopic repair of rotator cuff tear. In the remnant-reservation group (16 cases): 5 males and 11 females with an age of (61.8±9.9) years, 9 left and 7 right shoulders affected, and (3.7±1.1) cm in size of rotator cuff tear; in the remnant-sacrifice group (16 cases): 4 males and 12 females with an age of (61.3±8.8) years, 8 left and 8 right shoulders affected, and (3.9±0.9) cm in size of rotator cuff tear. The 2 groups were compared in terms of visual analogue scale (VAS), American Shoulder and Elbow Surgeons (ASES) score, Constant-Murley shoulder function score (Constant score), and range of motion of the affected shoulder before surgery, 3 months after surgery and at the last follow-up. The ratio of bilateral abductor muscle strengths (affected side/healthy side) was analyzed and compared between the 2 groups, and the healing of the rotator cuff was evaluated by MRI at the last follow-up.Results:The 2 groups were comparable because there were no significant differences in all their preoperative demographic data ( P>0.05). The 32 patients were followed up for (14.3±3.5) months after surgery. At 3 months after surgery, the VAS score in the remnant-reservation group [1.0 (0.0,1.0) point] was significantly lower than that in the remnant-sacrifice group [1.0 (1.0,1.0) point] ( P<0.05), but there was no significant difference between the 2 groups in ASES score, Constant score or range of motion of the affected shoulder ( P>0.05). At the last follow-up, the ASES score, forward flexion, abduction and ratio of bilateral abductor muscle strengths (affected side/healthy side) in the remnant-reservation group [(96.1±4.8) points, 170.0 (170.0,170.0)°, 160.0 (160.0,170.0)°, and 85.5%±13.8%]were significantly better than those in the remnant-sacrifice group [(91.4±5.9) points, 160.0 (160.0,170.0)°, 150.0 (140.0,155.0)°, and 72.6%±16.9%] ( P < 0.05), but there were no statistically significant differences between the 2 groups in VAS score, Constant score, neutral external rotation angle, or body-side internal rotation ( P>0.05). The Sugaya grading for MRI rotator cuff healing was significantly different between the 2 groups at the last follow-up ( P<0.05). Conclusion:In arthroscopic repair of rotator cuff tear, reservation of remnants in the footprint area can significantly relieve postoperative shoulder pain, and has obvious advantages in restoration of shoulder forward flexion, abduction and abductor muscle strength, leading to better healing of the rotator cuff and the large nodule than the remnant-sacrifice technique.