BACKGROUND: The meniscus has limited ability in repairing itself after being injured. However, tissue engineering provides a new way to meniscus repair after injury. Bone marrow mesenchymal stem cells (BMSCs), which possess the potential of multi-directional differentiations, can be ideal seed cells in meniscus tissue engineering. OBJECTIVE: To investigate the feasibility of differentiation of in vitro cultured porcine BMSCs into fibrochondrocyte phenotypes in inductive medium. METHODS: BMSCs were isolated with whole bone marrow culture method. Then, BMSCs of the third passage were digested and incubated in a medium containing transforming growth factor-β1, insulin-like growth factor-Ⅰ, dexamethasone and ascorbic acid in a 24-well plate at a density of 2.0×10~4/cm~2 in the experimental group. While in the control group, the DMEM-LG complete culture medium containing no inductive factor were used instead. At day 7, 14 and 21 after induction respectively, Toluidine blue staining and immunocytochemical staining were performed to detect differentiation. MAIN OUTCOME MEASURES: ①Population double time (PDT) of BMSCs; ②Morphological changes of BMSCs under light microscope;③Proteoglycan expression;④Collagen type Ⅰ and type Ⅱ expression. RESULTS AND CONCLUSION: ① The PDT of the second passage BMSCs was 2 days, which was the shortest. The PDT prolonged relatively after the fourth passage, which were 5 to 9 days. ② The BMSCs changed from a spindle-like appearance into a polygonal shape after induction. ③ In the experimental group, toluidine blue staining resulted in hyacinthine-stained cytoplasm and the blue was even deeper in the area where cells were dense; The degree of staining increased with the increasing induction time. While in the control group, only nucleus of BMSCs were stained blue. ④ Collagen type Ⅰ immunocytochemical staining was positive in both the experimental and the control group and there was no difference of significance between various induction time. No collagen type Ⅱwas seen expressed in the control group, while in the experimental group it was seen to be expressed steadily after 14 days of induction. It is indicated tlat BMSCs can be induced to synthesize fibrochondrocyte-characterized extracellular matrixes in vitro, which suggests that BMSCs are available as seed cells in meniscus tissue engineering.

Objective To detect the preliminary results of combined periacetabular and intertrochanteric osteotomies for complex hip dysplasia.Methods From January 2006 to August 2011,23 patients (25 hips) with complex hip dysplasia were treated with combined periacetabular and intertrochanteric osteotomies (ITO).Valgus ITO was performed on 2 hips and varus ITO on others.The averagc age of patients at the time of index procedure was 20.5± 3.9 years (range:15 to 26).The hip pain period before surgery varied from 5 to 24 months (mean 11±4.7 months).The Shenton's line was broken in every hip and the mean preoperative lateral central edge angle (LCEA) was 5.6°±4.6°.The average preoperative fenoral neck-shaft (CCD) angles were 158°±3.2° and 110° in 23 valgus hips and both of two varus hips respectively.The preoperative Harris hip score was 76.7±3.7.According to T(o)nnis osteoarthritis grades,there were 7 hips at grade 0,12 hips at grade Ⅰ and 6 hips at grade Ⅱ.Results The mean followup period was 40±18 months (range:12 to 78).The CCD angle (130°±2.1°),LCEA (28.6°±2.9°) and Harris hip score (90.8±3.3)were all improved postoperatively,whereas no progression was found in preoperative T(o)nnis grades.The postoperative Harris hip scores were excellent in 17 hips and good in 8 hips.The T(o)nnis osteoarthritis grades were grade 0 in 6 hips,grade Ⅰ in 11 hips and grade Ⅱ in 8 hips.There wcre six cases with lateral femoral cutaneous nerve injury,three cases with limp and two cases with broken Shenton's line.Neither femoral head necrosis nor bone nonunion was found in this study.Conclusion Satisfactory preliminary results could be obtained through combined periacetabular and intertrochanteric osteotomies among patients with complex hip dysplasia.The risk of femoral head necrosis and bone nonunion was low.

Evacuation of intracerebral hematomas in 38 hypertensive patients was reported. Hematomas were found in the internal capsule in 24 patients, subcortex in 5. cerebellum in 7 and brain stem in 2. The volume of hematoma was less than 2ml (in the brain stem) in 2 patients, 20-50ml in 15, and over 100ml in 6. The fluid hematoma was to tally aspirated with stereotactic technique in 7 patients. In 17 patients, over 80% of hematoma was evacuated, and in 14 about 60-80% of hematoma was evacuated by the same technic. The results of the operation were good in 11 patients (29.0%), while in 29% there was a mild disability, and in 12 (31.5%) there was a marked disability, 4(10.5%) died.

Objective:To identify potential risk factors of varus collapse after unstable proximal humerus fracture treated with locking plates.Methods:A retrospective case series study was conducted on data of 146 patients with unstable proximal humerus fracture stabilized by locking plates at Xinhua Hospital, Shanghai Jiaotong University School of Medicine from January 2008 through December 2014. These patients were classified into varus collapse group ( n=39) and non-varus collapse group ( n=107) according to the occurrence of varus collapse. The gender, age, bone mineral density, cause of injury, fracture Neer classification, fracture type (varus or valgus), surgical timing, surgical techniques (medial support, cancellous bone graft, suture augmentation), number of humeral head screws and reduction quality were recorded. Potential risk factors were evaluated using univariate analysis and multivariate Logistic regression. The subjective reliability analysis was performed for Neer classification and medial fracture assessments. Results:Varus collapse group had higher ratio of osteoporosis, varus fracture, lack of medial column support, absence of suture augmentation and varus malreductin compared to non-varus collapse group ( P<0.05). While the two groups had no significant differences in gender, age, fracture classification, allogeneic cancellous bone transplantation and number of humeral head screws ( P>0.05). Moreover, the Logistic regression analysis indicated that osteoporosis, varus fracture, lack of medial column support, absence of suture augmentation and varus malreduction were major independent risk factors for varus collapse in proximal humerus fractures ( P<0.05). Among these risk variables, the lack of medial column support showed the strongest correlation of varus collapse after proximal humerus fractures treated with locking plates ( OR=9.62), and varus malreduction was another remarkable risk factor ( OR=8.39). The reliability of Neer classification and medial fracture assessments between interobservers and intraobservers was good. Conclusion:The risk factors for varus collapse after unstable proximal humerus fracture treated with locking plate are osteoporosis, varus fracture, lack of medial column support, absence of suture augmentation and varus malreduction.

Objective:To investigate the effect of passive motion and immobilization on shoulder function early after arthroscopic repair of rotator cuff tears.Methods:A retrospective case-control study was conducted to analyze the clinical data of 78 patients with rotator cuff tear admitted to Xinhua Hospital, Shanghai Jiaotong University School of Medicine from January 2016 to December 2017. There were 36 males and 42 females, aged 35-78 years [(62.7±3.2)years]. There were 36 patients with medium-sized tears (1-3 cm), 31 with small tears (<1 cm), and 11 with partial articular supraspinatus tendon avulsion (PASTA). All patients underwent arthroscopic rotator cuff repair. Forty-three patients started rehabilitation exercise immediately after operation (motion group). Thirty-five patients were immobilized with shoulder abduction brace for 6 weeks, and started rehabilitation exercise at week 7 (immobilization group). The range of motion, visual analogue pain score (VAS), simplified shoulder joint function test (SST) and Constant shoulder joint score were compared between the two groups before surgery, 6 weeks, 3 months and 12 months after surgery. The healing results were assessed by ultrasound 12 months after surgery. Complications were observed.Results:All the patients were followed up for 12-16 months [(13.7±1.3)months]. There were 7 patients with shoulder joint stiffness in each group (motion group: 16%, immobilization group: 20%) ( P<0.05). There were no significant differences between the two groups in VAS, SST or Constant score at postoperative 6 weeks, 3 months and 12 months ( P>0.05). The forward flexion and external rotation with the arm at the side in immobilization group was (124.9±12.9)° and 25(20, 30)° at postoperative 6 weeks, significantly improved in motion group [(136.6±16.7)°, 30(25, 40)°] ( P<0.05). There were no significant differences between the two groups in forward flexion and external rotation with the arm at the side at postoperative 3 and 12 months ( P>0.05). There were no significant differences between the two groups in internal rotation at postoperative 6 weeks, 3 months, and 12 months ( P>0.05). All rotator cuffs were healed verified by ultrasound at postoperative 12 months. No infection or implant displacement occurred after operation. Conclusions:For arthroscopic repair of medium-sized tears, small tears and PASTA, early postoperative rehabilitation exercises have advantage in improving range of motion only at early stage when compared to immobilization, which disappears with time. Moreover, the two methods have no significant differences in improving postoperative pain and shoulder function.

Objective:To compare the application effect of remote intelligent rehabilitation system and conventional rehabilitation in rehabilitation of patients with rotator cuff injury following minimally invasive arthroscopic surgery.Methods:A retrospective cohort study was used to analyze the clinical data of 47 patients with rotator cuff injury admitted to Xinhua Hospital, Shanghai Jiao Tong University School of Medicine from January to July 2022, including 18 males and 29 females; aged 45-65 years [(56.7±6.3)years]. All patients underwent minimally invasive arthroscopic surgical repair of rotator cuff rupture. After surgery, 25 patients underwent self-rehabilitation with conventional education (conventional rehabilitation group), and 22 patients underwent systematic rehabilitation with remote intelligent rehabilitation system (remote rehabilitation group). Constant shoulder score, University of California at Los Angeles (UCLA) shoulder score, self-rating anxiety scale (SAS) score, self-rating depression scale (SDS) score and visual analog score (VAS) were compared between the two groups on the day of admission, 4, 8, 12 weeks after surgery and at the last follow-up. Shoulder MRI was applied at 6 weeks after surgery to compare the degree of intra-articular effusion and bone marrow edema between the two groups. The shoulder range of motion of the two groups was compared at 12 weeks after operation. The satisfaction with the rehabilitation of the two groups was compared at the last follow-up.Results:All the patients were followed up for 6-10 months [(8.5±2.2)months]. There was no significant difference in Constant shoulder score, UCLA shoulder score, SAS score, SDS score and VAS between the two groups on the day of admission (all P>0.05). There was no significant difference in Constant score, UCLA score and SAS score between the two groups at 4 weeks after surgery (all P>0.05). The values of SDS score and VAS at 4 weeks after surgery were (31.8±6.6)points and (3.6±1.1)points in the remote rehabilitation group, which were better than those in the conventional rehabilitation group [(40.5±5.6)points and (4.7±1.3)points] (all P<0.05). The values of Constant score, UCLA score, SAS score, SDS score and VAS at 8 weeks after surgery were (62.5±5.5)points, (18.5±3.3)points, (20.5±4.7)points, (22.5±4.6)points and (2.5±0.6)points in the remote rehabilitation group, which were better than those in the conventional rehabilitation group [(41.3±4.7)points, (15.3±3.1)points, (28.5±4.8)points, (38.5±3.7)points and (3.3±1.3)points] ( P<0.05 or 0.01). The values of Constant score, UCLA score, SAS score and SDS score at 12 weeks after surgery were (85.4±6.4)points, (32.2±3.8)points, (13.6±2.8)points and (18.4±3.9)points in the remote rehabilitation group, which were better than those in the conventional rehabilitation group [(60.3±6.7)points, (25.2±4.1)points, (21.5±4.9)points and (26.7±6.6)points] (all P<0.05), while there was no significant difference in VAS between the two groups ( P>0.05). At the last follow-up, there were no significant differences in Constant score, UCLA score, SAS score, SDS score and VAS between the two groups (all P>0.05). MRI of the shoulder joint at 6 weeks after surgery indicated that the degree of intra-articular effusion in the shoulder joint and bone marrow edema of the proximal humerus in the remote rehabilitation group was significantly reduced than that in the conventional rehabilitation group. At 12 weeks after surgery, the remote rehabilitation group had better shoulder range of motion than the conventional rehabilitation group ( P<0.05 or 0.01). At the last follow-up, the satisfaction with the rehabilitation of the remote rehabilitation group was better than that of the conventional rehabilitation group ( P<0.01). Conclusion:For patients with rotator cuff injury who undergo minimally invasive arthroscopic surgery, postoperative application of remote intelligent rehabilitation system, in comparison with the conventional rehabilitation system, can help to facilitate shoulder function recovery, anxiety and depression improvement and pain relief in the early stage, reduce shoulder soft tissue and bone marrow edema of the shoulder, and increase shoulder range of motion and patients′ satisfaction with the rehabilitation.