Abstract:"There will be no comprehensive well-off of this nation without national population health". It has become a consensus that sports are a good way to improve population physical fitness, and the sports and medicine must be combined together. The health problems of the elderly and teenagers are attracting increasing attention. However, sports not only keep your fitness, but also bring risks of sports inju- ry. As consequence of “rounds of visits, lecture and survey” by the expert team of the army's arthroscopic sports medicine, the incidence of military training injuries has been greatly reduced, whereas training performance has been significantly improved. In recent ten years, ar- throscopy and sports medicine has developed vigorously in China. Under the guidance of minimally invasive surgery concept and innovative ideas, we have made rapid progress in knee, shoulder, hip, ankle and other arthroscopic techniques, independently developed a number of arthroscopic surgical implants, especially pioneering the extension of arthroscopic technique to the treatment of diseases beyond the joint. As long as we boldly imagine, carefully verify, practice and study hard, we can walk in the forefront of minimally invasive arthroscopic tech- niques. Everything we do is for the health of the people!

Abstract:[Objective] To evaluate the clinical outcomes of bone cement augmented proximal femoral nail anti-rotation (PFNA) for in- ternal fixation of osteoporotic femoral intertrochanteric fractures. [Methods] A retrospective study was conducted on 99 patients who re- ceived surgical treatment for osteoporotic femoral intertrochanteric fractures from June 2016 to June 2020. Based on doctor-patient commu- nication, 42 patients received cement-augmented PFNA fixation, while the other 57 patients underwent hip hemiarthroplasty (HA) . The perioperative, follow-up and imaging data were compared between the two groups. [Results] All the patients in both groups had correspond- ing surgical procedures performed successfully without serious complications, with no significant differences in terms of operative time, inci- sion healing, postoperative ambulation time and hospital stay between the two groups (P＞0.05) . As time went during the follow up lasted for (24.52±8.65) months on an average, the VAS score decreased significantly (P＜0.05) , whereas the Harris score, hip flexion-extension range of motion (ROM) , and internal-external rotation ROM significantly increased in both groups (P＜0.05) . However, there were no significant differences in abovesaid items between the two groups at any matching time points (P＞0.05) . In addition, there was no a significant differ- ence in the time to resume full-weight bearing activity between the two groups (P＞0.05) . Radiographically, there were no statistically signif- icant differences in femoral shaft angle, femoral head offset, or femoral length compared with the healthy side between the two groups at the latest follow up (P＞0.05) . [Conclusion] This cement-augmented PFNA fixation of osteoporotic femoral intertrochanteric fractures is benefi- cial to the early recovery of walking and weight-bearing activities, and achieves the clinical outcomes similar to the HA.

Abstract:[Objective] To compare the short-term clinical outcomes of femoral neck system (FNS) versus inverted cannulated cancel- lous screw (ICCS) for femoral neck fractures. [Methods] A retrospective study was done on 73 patients who received internal fixation for femoral neck fracture from January 2018 to March 2021. According to preoperative doctor-patient communication, 33 patients were treated with FNS, while the remaining 40 patients were with ICCS. The perioperative, follow-up and imaging results were compared between the two groups. [Results] All the patients in both groups were operated on successfully without neurovascular injury and other serious complica- tions. Although there were no significant differences in operative time, total incision length, intraoperative blood loss and hospital stay be- tween the two groups (P＞0.05) , the FNS group proved significantly superior to the ICCS group in terms of intraoperative times of fluorosco- py and postoperative ambulation time (P＜0.05) . The follow-up period lasted for (17.91±3.63) months on an average, and the FNS group re- sumed full- weight-bearing activity significantly earlier than the ICCS group (P＜0.05) . The VAS scores decreased significantly (P＜0.05) , while the hip extension and flexion range of motion (ROM) , hip internal and external rotation ROM, and Harris score significantly in- creased in both groups over time after surgery (P＜0.05) . The FNS group was significantly superior to the ICCC group in terms of VAS score at the latest follow up (P＜0.05) , and Harris score at all corresponding time points postoperatively (P＜0.05) . Radiographically, there was no a statistically significant difference in Garden alignment index between the two groups postoperatively (P＞0.05) , but FNS proved signifi- cantly superior to ICCS group in terms of fracture healing time and femoral neck shortening (P＜0.05) . In addition, there were no significant differences between the two groups in terms of neck-shaft angle, T?nnis hip osteoarthritis grade, as well as incidences of bone nonunion, in- ternal fixation failure and femoral head necrosis (P＞0.05) . [Conclusion] The FNS for internal fixation of femoral neck fracture takes the ad- vantages of strong fixation stability, good recovery of hip function and fast fracture healing.

Abstract:[Objective] To investigate the clinical efficacy of percutaneous vertebroplasty (PVP) with calcium phosphate composed bone cement for single-segment thoracolumbral compression fracture in osteopenia. [Methods] A retrospective study was conducted on 69 patients who were hospitalized in our department for single-segment thoracolumbar fracture in osteopenic condition from January 2018 to December 2019. According to doctor-patient communication, 32 patients received composite bone cement PVP, while the other 37 patients received conservative treatment (the CT group) . The clinical and imaging data of the two groups were compared. [Results] All the patients in the PVP group had operation performed successfully despite of 2 cases of intervertebral leakage occurred during operation, whereas all those in the CT group had no adverse reaction during the therapy. All the 69 patients were followed up for (14.01±1.12) months on an aver- age. The PVP group resumed walking, and full weight-bearing activity significantly earlier than the CT group (P＜0.05) . The VAS and ODI scores significantly decreased (P＜0.05) , whereas JOA scores significantly increased over time in both groups (P＜0.05) , which in PVP group proved significantly superior to the CT group at 6 months after treatment (P＜0.05) , whereas became not statistically significant be- tween them at the last follow-up (P＞0.05) . Radiographically, the PVP group got a significant increase of the anterior height of injured ver- tebrae, while a significant decrease of local kyphotic Cobb's angle at 6 months and at the latest follow-up compared with those before treat- ment (P＜0.05) . However, the CT group got significantly reverse variations in the anterior vertebral body height and local kyphotic Cobb's angle anomg the time points compared with the PVP group (P＜0.05) . At corresponding time points after treatment, the PVP group was sig- nificantly superior to the CT group in abovesaid image indexes (P＜0.05) , regardless of the fact that no statistically significant differences in the radiographic parameters were noticed before treatment. [Conclusion] Calcium phosphate composed bone cement PVP is a safe and reliable treatment for single-segment thoracolumbar fracture in the osteopenic condition, which relieve pain quickly, recover function faster without long-term bed rest.

Abstract:[Objective] To compare the clinical outcomes of atlantoaxial fusion versus occipitocervical fusion for os odontoideum com- plicated with atlantoaxial dislocation. [Methods] A retrospective study was done on 29 patients who underwent posterior fusion for os odon- toideum complicated with atlantoaxial dislocation from January 2010 to December 2015. According to the concrete pathology and the re- sults of preoperative doctor-patient communication, 22 patients received atlantoaxial fusion (the AA group) , while the remaining 7 patients had occipitocervical fusion performed (the OC group) . The perioperative, follow- up and imaging data were compared between the two groups. [Results] All patients in both groups were successfully operated on without serious complications, and the atlantoaxial fusion group was significantly superior to the occipitocervical group in term of incision length (P＜0.05) . All patients in both groups were followed up for more than 6 years, and the AA group resumed full weight-bearing activity significantly earlier than the OC group (P＜0.05) . Cervical flex- ion-extension ROM and left-right rotation ROM were significantly reduced in both groups after surgery compared with those preoperative- ly (P＜0.05) . The AA group proved significantly superior to the OC group in term of cervical flexion-extension ROM postoperatively (P＜ 0.05) . The NDI scores decreased significantly (P＜0.05) , while JOA score increased significantly in both groups over time (P＜0.05) , howev- er, there were no statistically significant differences in NDI and JOA scores between the two groups at any corresponding time points (P＞ 0.05) . Radiographically, the C_0~2 angle increased significantly (P＜0.05) , whereas the C_2~7 angle and anterior atlantodental interval (ADI) de- creased significantly postoperatively compared with those preoperatively in both groups (P＜0.05) . The AA group got less ADI than the OC group postoperatively, which proved statistically significant at 5 years after surgery (P＜0.05) . [Conclusion] Both atlantoaxial fusion and oc- cipitocervical fusion are safe and effective for this disorder. By comparison, the atlantoaxial fusion takes advantages of reducing surgical trauma, improving atlantoaxial reduction, retaining more cervical motion, and getting better functional recovery.

Abstract:[Objective] To explore the significance of tranexamic acid (TXA) used in total hip arthroplasty (THA) with HIV infection. [Methods] A total of 59 male patients who underwent primary unilateral THA for femoral head necrosis complicated with HIV infection from November 2010 to September 2020 were enrolled into this study. Of them, 31 patients had TXA used, while the remaining 28 patients had no TXA applied. The documents regarding to perioperative clinical consequences, laboratory test and color ultrasound examination were compared between the two groups. [Results] Although there was no significant difference in operation time and incision length be- tween the two groups (P＞0.05) , the TXA group proved significantly superior to the non-TXA group in terms of blood loss, including total blood loss, dominant blood loss, recessive blood loss, blood transfusion rate, incision healing grade, hospital stay and the time to resume full weight-bearing activity (P＜0.05) . Ultrasonographically, there was no significant difference in intermuscular vein thrombosis found between the two groups before and 3 days after operation (P＞0.05) . In terms of laboratory test, Hb and Hct in the TXA group were significantly high- er than those in the non-TXA group 1 and 3 days postoperatively (P＜0.05) , in addition, the CRP at 3 and 7 days after operation, ESR and DD 7 days postoperatively in TXA group were significantly lower than those in non-TXA group (P＜0.05) . [Conclusion] TXA is a safe and effective adjunctive drug used for THA of HIV patients, which can reduce perioperative blood loss and incision complications without in- creasing the incidence of venous thrombosis.

Abstract:[Objective] To systematically compare the clinical outcomes of nano- hydroxyapatite (NHP) versus polyetheretherketone (PEEK) cages used in spinal interbody fusion. [Methods] The clinical studies on the comparison of spinal fusion efficacy with NHP versus PEEK cages were collected from CNKI, Wanfang, VIP, EMBASE, PubMed and The Cochrane Library CBM databases before October 2021. Meta- analysis of outcome indicators was conducted using Stata/SE 12.0 software. [Results] A total of 6 studies were included into the study, involving 654 patients, including 365 patients in the NHP group and 289 patients in the PEEK group. As result of the meta-analysis, there were no significant differences between the two groups in terms of intervertebral height (WMD=- 0.02, 95% CI:-0.21~0.17, P= 0.843) , fusion rate (RR=1.002, 95%CI: 0.96~1.05, P=0.911) , collapse rate (RR=0.824, 95%CI: 0.47~1.44, P=0.494) , postoperative ODI (WMD=0.13, 95%CI: -0.77~1.03, P=0.779) , postoperative VAS score (WMD=0.11, 95%CI: -0.40~0.62, P=0.675) , fusion level curvature (WMD=-0.13, 95%CI：-0.63~0.3, P=0.598) , operative time (WMD=-2.26, 95%CI: -7.17~2.64, P=0.366) , and intraoperative blood loss (WMD=1.08, 95%CI: -9.66~11.83, P=0.844) . [Conclusion] The NHP cage proves similar safety and clinical outcomes with the PEEK cage, and the former is an ideal intervertebral fusion device to replace the latter.

Abstract:Currently there is no consensus on the surgical treatment of the posterolateral tibial fractures (PLFs). The posterolateral tibi- al plateau is a complex anatomical structure, which is adjacent to the fibular head, common peroneal nerve, popliteal blood vessel, and sur- rounded by the strong popliteal muscle and capsule. The traditional anterolateral approach can not achieve the direct visualization of the PLFs. Therefore, restoring the flat shape of the articular surface, the anatomical axial alignment, and achieving the bone and ligament struc- ture stability for the PLFs remain challenging.

Abstract:Osteoporosis is a degenerative disease characterized by reduced bone quality and strength, which can lead to brittle frac- ture, but it is often not fully treated and diagnosed in clinical practice. Bone metabolic markers play an irreplaceable role in the diagnosis and treatment of osteoporosis. This paper reviews the common bone metabolic markers and their application in the diagnosis and treatment of osteoporosis, providing more detailed and accurate reference and ideas for the clinical diagnosis and treatment of osteoporosis.

Abstract:[Objective] To explore the effect of TNF-α on the senescence of human nucleus pulposus mesenchymal stem cells. [Methods] The normal human nucleus pulposus mesenchymal stem cells (hNPMSCs) were isolated from human undegenerated lumbar disc and cultured to the third generation, and then divided into the normal blank control group and TNF-α group, which were treated with serumfree medium, and serum-free medium contenting TNF-α of 100 ng/ml for another 48 h respectively. The cell morphology was observed un- der the microscope and then stained by senescence β-galactosidase kit. CCK-8 assay was used to assess the cell viability at 1, 3, 5, 7, 9, 11, 13, and 15 days after treatment, while western blot assay was performed to detect the expression of aging-related protein p53 and p16. [Results] The microscopic observation and β-galactosidase staining showed that the hNPMSCs treated with TNF-α were considerably more senescent than those in the blank control group. As results of CCK-8 assay, the optical density (OD) presenting cell proliferation viability ramped up significantly in both groups over time (P＜0.05) . Although there were not statistically significant differences between the two groups from 1 day to 7 days (P＞0.05) , the TNF-α group had significantly lower OD than the control group from 9 days to 15 days (P＜0.05) . Regarding to western blot detection, the TNF-α group presented significantly higher expression of aging-related proteins p53 and p16 than the control group (P＜0.05) . [Conclusions] In this study, the TNF-α does inhibit cell proliferation of hNPMSCs, whereas accelerate senes- cence of the cells.

Abstract:[Objective] To compare the biomechanical variations of anterior cruciate ligament (ACL) tear accompanied with Ramp inju- ry and different repairs for them. [Methods] A total of 16 fresh cadaver knees were treated and tested in the following order: normal control (NC) , ACL cutting and Ramp injury (ACRI) , ACL reconstruction and Ramp injury (ARRI) group. After that, the 16 knees were divided in- to two groups with 8 knees in each group, including ACL reconstruction and suture hook repair for Ramp injury (ARSH) and ACL recon- struction and Fast-fix repair for Ramp injury (ARFF) . After the specimens were fixed in the mechanical tester, the tibial translation, inter- nal rotation and external rotation were measured under constant anteroposterior 134 N load and 5 N · m internal and external rotation torque at 0°, 30°, 60°, 90° flexion of the knee. [Results] The total order of tibial anterior displacement, internal rotation and external rota- tion from low to high was of NC ＜ ARSH ＜ ARFF ＜ ARRI ＜ ACRI, with statistically significant differences among the 5 groups (P＜0.05) . In any degrees of knee flexion, there was no significant difference in the tibia anterior displacement between ARSH group and ARFF group (P＞0.05) . However, the ARSH group had significantly less tibial internal rotation than ARFF group at 0°, 30° and 60° knee flexion (P＜ 0.05) , although there was no statistical significance between them at 90° knee flexion (P＞0.05) . In addition, there was no significant differ- ence between ARSH group and ARFF group in tibial external rotation at any knee flexion angles (P＞0.05) . [Conclusion] Both suture hook and fast fix for repair of Ramp injury following ACL reconstruction are effective treatments for the complex injuries, by contrast, suture hook repair achieve better restoration of internal rotation stability of the knee.

Abstract:[Objective] To explore the repair effect of adipose-derived mesenchymal stem cell sheet on articular cartilage defect in rab- bit. [Methods] In vitro, rabbit adipose-derived mesenchymal stem cells were isolated and cultured, and then were identified by multi-line differentiation. Subsequently, the adipose-derived mesenchymal stem cell sheet was constructed by chemical method with adding 50μg/ml ascorbic acid. The sheet structure of the cell was investigated by inverted phase contrast microscope, in addition, the gross observation and scanning electron microscope. In vivo, the osteochondral defect models with 3.5mm in diameter and 3mm in depth was prepared on the fem- oral condyles in rabbits, and divided into two groups, the blank control group and cell sheet group with a cell sheet implanted on the defect. Three months later, specimens were harvested for gross evaluation and histological observation. [Results] In vitro, the primary rabbit adi- pose- derived mesenchymal stem cells grew adherently in a short spindle shape and triangle shape. After subculture, the cells gradually grew in a vortex shape. The third-generation rabbit adipose-derived mesenchymal stem cells had multi-lineage differentiation capacity. The rabbit adipose-derived mesenchymal stem cells sheet had a multi-layer structure, and the cells secreted a large amount of extracellu- lar matrix, with cells embedded in it. In vivo, the osteochondral defect had a large amount of new cartilage tissue regenerated in the cell sheet group at 3 months after implantation, which looked like normal cartilage in shape and color, whereas no new cartilage was seen in the blank control group. The cell sheet group was marked significantly higher O' Driscoll score than the blank control group (P＜0.05) . [Conclusion] This adipose-derived mesenchymal stem cell sheet does promote the articular cartilage regeneration in rabbit, which might provide a new idea for the repair of cartilage damage in clinical setting.

Abstract:[Objective] To propose a new reference method and related anatomical parameters for anterograde screw placement in the posterior column of the acetabulum, and to provide a basis for the design of the 3D printed guider. [Methods] The CT data of 40 adult pel- vis were collected and three-dimensional (3D) models were reconstructed by Mimics software. A cylinder was placed from the inner side of the iliac wing reaching to the posterior column and adjusted to the ideal position. The insertion point of the cylinder of the inner side of the iliac wing (A point) was set as the insertion point of the lag screw, whereas ischial tuberosity (B point) represented exiting point of lag screw. The C point was marked on the arcuate edge, which was the shortest distance to the arcuate edge from A point. In addition, the D point was marked on the most front of sacroiliac, and then the A point and C point, as well as the C point and the D point were connected. A flat square region near the posterior edge of the greater sciatic notch was found on mimics, a plane β was made parallel to this region, and a plane γ was made perpendicular to and tangent to the posterior edge of the greater sciatic notch. The distance between AC and CD, which represented the maximum radius and length of lag screw, as well as the angle between lag screw and plane β (a) and the angle between lag screw and plane γ (b) were measured. [Results] In term of gender, the males had the maximum radius and length of the screw significantly greater than the females (P＜0.05) , whereas the males had significantly shorter CD segment than females (P＜0.05) . However, there were no significant differences in terms of AC segment and angle a and angle b between the two genders (P＞0.05) . In term of bilateral sides, there were no statistically significant differences in the maximum radius, maximum length, AC segment, CD segment, and angle a and angle b be- tween the left and right sides (P＞0.05) . [Conclusion] According to the relevant anatomical data, the screw placement process will be more accurate and safe, which provides a basis for the design of 3D printed guider later.

Abstract:[Objective] To introduce the surgical technique and preliminary clinical results of unilateral biportal endoscopy (UBE) for double-segment lumbar spinal stenosis. [Methods] A total of 8 patients underwent UBE for double-segment lumbar spinal stenosis. The horizontal line of the three incisions passed through the lower edge of the pedicle of the upper vertebral body, the midpoint of the pedicle of the middle vertebral body, and the upper edge of the pedicle of the lower vertebral body, respectively. The intersection point between the line and the horizontal line of the inner edge of the left vertebral pedicle was the incision point. The observation channel and operation chan- nel were established successively to keep the lavage fluid flowing smoothly. The spinal canal was decompressed by using bur, osteotome, rongeur and other instruments, and then the discectomy was performed. On the second day after surgery, the patient got out of bed with a brace for 2 months. The VAS score, Oswestry disability index and modified Macnab criteria were used to evaluate the clinical efficacy. [Results] All patients had operation completed successfully with operation time of (192.52±14.14) min, whereas intraoperative dural sac tear happened in only 1 case. As time went during the follow-up lasted for (10.62±6.36) months (range, 6~15 months) , the VAS score and ODI score decreased significantly (P＜0.05) , in other word, the symptom relief became more obvious. At latest follow-up, the clinical outcomes were marked as excellent in 5 cases, good in 2 cases and fair in 1 case, with an excellent and good rate of 87.5%. [Conclusion] The unilat- eral biportal endoscopy is an effective method for the treatment of double-segment lumbar spinal stenosis.

Abstract:[Objective] To evaluate the clinical efficacy of head-neck fenestration bone autografting through direct anterior approach (DAA) for pericollapse-stage femoral head necrosis. [Methods] A retrospective study was conducted on 32 patients (37 hips) who under- went head-neck fenestration bone autografting through DAA for pericollapse-stage femoral head necrosis from September 2015 to March 2018. The clinical and imaging results were observed. [Results] All patients were successfully operated on without neurovascular injury and other serious complications. During follow-up period lasted for (35.23±10.35) months, 5 patients (5 hips) who had clinical symptoms worsen, including 2 hips turned to total hip arthroplasty (THA) , were judged as hip preservation failure, accounting for 13.51%, while the remaining 27 patients (32 hips) who got continuous improvement in clinical symptoms were marked as successful hip preservation, account- ing for 86.49%. The VAS score for hip pain significantly decreased (P＜0.05) , while Harris score, hip extension-flexion, internal-external rotation range of motions (ROMs) significantly increased at the latest follow up compared with those preoperatively (P＜0.05) . Radiographi- cally, there were no significant changes in the area of necrosis, head collapse, and articular space at the latest follow-up compared with those before operation (P＜0.05) . [Conclusion] This head-neck fenestration bone autografting through DAA still achieves acceptable clini- cal outcomes for the pericollapse-stage femoral head necrosis

Abstract:[Objective] To evaluate the clinical outcomes of arthrography assisted reduction combined with fixation by unilateral exter- nal fixator for fresh Monteggia fractures in children. [Methods] A total of 16 children with fresh Monteggia fractures were enrolled in this study. Intraoperative fracture reduction was performed with arthrography used to evaluate the reduction effect, followed by the fixation with unilateral external frame. [Results] All the children were successfully operated on without related complications, while with angiography time of (4.55±1.03min) , operation time of (32.56±4.45) min, blood loss of (8.25±3.36) ml, and the time to return active motion of (4.85± 0.67) weeks. All 16 patients were followed up for 6~18 months, and the elbow flexion- extension range of motion (ROM) and forearm rota- tion ROM significantly increased at the latest follow-up compared with those at 6 weeks after operation (P＜0.05) . According to Mackay's criteria, the excellent and good rate of the clinical outcome was 100%. Postoperative imaging showed that the good rate of fracture reduction was 100%. At 6 weeks postoperatively and the latest follow-up, all patients got normal humeroradial congrunce and proper ulnar alignment without angulation. [Conclusion] Arthrography assisted reduction combined with fixation by unilateral external fixator has advantages of simple operation, little iatrogenic trauma and reliable treatment outcomes for Monteggia fractures with long oblique ulnar diaphysis fracture in children.

Abstract:[Objective] To evaluate the clinical outcomes of open reduction and internal fixation (ORIF) by surgical hip dislocation (SHD) for femoral neck fracture in the middle-aged patients and young adults. [Methods] From June 2018 to June 2019, 15 middle-aged and young patients (15 hips) received ORIF by SHD approach for femoral neck fracture. The clinical results and imaging data were summa- rized. [Results] All the 15 patients in this study had the surgical procedures completed successfully with operation time of (100.00±12.32) min, intraoperative blood loss of (300.00±26.99) ml, and well incisions healing, whereas without early complications such as wound infec- tion and deep vein thrombosis. All the patients were followed up for (13.80±1.61) months, with walking time of (13.00±1.13) weeks, and full weight-bearing activity time of (16.46±1.41) weeks postoperatively. The Harris and JOA hip scores significantly improved at the latest fol- low-up compared with those at 3 months postoperatively (P＜0.05) . In terms of imaging, anatomical reduction achieved in 12 cases, and ac- ceptable reduction in 3 cases, and no poor reduction was found, with the anatomical reduction rate of 80.00%. The regular X-ray checks showed that both the medial femoral neck buttress plate and the cannulated screw remained in place, and fracture healing time ranged from 4 to 6 months. [Conclusion] The ORIF by SHD does achieve satisfactory clinical outcomes for femoral neck fracture in middle-aged and young adults in this study.

Abstract:[Objective] To investigate the effects of sagittal configuration related anatomical morphology parameters of lateral femoral condyle on anterior cruciate ligament (ACL) injury. [Methods] A retrospective study was conducted on 100 patients who received knee ar- throscopic surgery from January 2017 to January 2020. Of them, 50 patients had ACL injury (the injury group) and 50 patients had simple meniscus injury (the control group) . The lateral femoral condylar index (LFCI) and the posterior condylar ratio of lateral femoral condyle were measured and compared between the two groups, while ROC analysis was performed for ACL injury. [Results] The posterior condyle diameter and LFCI of the injured group were significantly lower than those of the control group (P＜0.05) , but there was no significant differ- ence in anterior condyle diameter between the two groups (P＞0.05) . The distal femoral diameter of the injured group was larger than that of the control group (P＜0.05) , but the posterior condylar ratio of the injured group was significantly smaller than that of the control group (P＜ 0.05) , and there was no statistically significant difference in the posterior condyle eccentricity between the two groups (P＞0.05) . As results of ROC analysis, the area under curve (AUC) of LFCI and posterior condylar ratio of lateral femur condyle were 0.717 and 0.713, respective- ly. [Conclusion] LFCI and posterior condylar ratio of the lateral femoral condyle might be regarded as predictors of ACL injury.

Abstract:[Objective] To compare the clinical efficacy in short term of arthroscopic repairing versus conservative treatment for sports rotator cuff injury. [Methods] From May 2016 to November 2020, 100 patients with sports rotator cuff injury were treated in our depart- ment. According to the results of doctor-patient communication before treatment, 50 patients were treated with the surgery, while the other 50 patients underwent the conservative treatment. The clinical efficacy was compared between the two groups. [Results] The patients in both groups were successfully treated without serious complications. The QOL, UCLA, and Constant-Murley scores, as well as abductionuplifting range of motion (ROM) and external rotation ROM increased significantly over time in both groups (P＜0.05) . Although there were no statistically significant differences between the two group in terms of QOL, UCLA and Constant-Murley scores, as well as abduction up- lifting ROM and external rotation ROM before operation (P＜0.05) , the surgical group proved significantly superior to the conservative group in abovementioned items at 8 weeks, 3 months and 6 months postoperatively (P＜0.05) . [Conclusion] Compared with conservative treatment, arthroscopic repairing is an effective treatment for sports rotator cuff injuries, does relieve pain and improve shoulder function and quality of life effectively.