Abstract:Hip arthroscopy has developed rapidly in recent 10 years, and has become the most important technique in hip surgery. This issue of the Orthopaedic Journal of China focuses on the development of hip arthroscopy in China in recent years, involving the basic techniques of hip arthroscopy, as well as the treatment of hip infection, labial lesions, femoroacetabular impingement, early femoral head ne- crosis and acetabular dysplasia. Standardized training of hip arthroscopy techniques should be enhanced, while criteria for accessing hip surgery and expert consensus on hip arthroscopic diagnosis and operation specification should be set up. In addition, sports medicine, joint surgery, imaging, ultrasonic diagnosis, rehabilitation and nursing teams should be combined to be a multi- disciplinary group to improve fast booming of hip surgery.

Abstract:[Objective] To explore the clinical outcomes of hip arthroscopy for mere pincer- type femoroacetabular impingement. [Methods] A retrospective study was conducted on a total of 24 patients who underwent hip arthroscopy for mere pincer-type femoroacetab- ular impingement in our department from June 2017 to July 2019. The patients included 14 females and 10 males, aged (33.52±11.42) years on average, and received arthroscopic acetabuloplasty for the pincer-type femoroacetabular impingement. [Results] All the patients were successfully operated on under arthroscope, and were confirmed to have pincer-type impingement only without femoral head- neck junction cam-like osteophytes. All patients got incisions healing primarily without complications such as intraarticular infection, necrosis of femoral head, deep vein embolism and nerve injury of lower limb. All the 24 patients were followed up for more than 12 months. The flex- ion, adduction and internal rotation (FADIR) test, as well as the flexion, abduction and external rotation (FABER) tests significantly im- proved in the 24 patients at 6 months postoperatively and at the last follow-up compared with those preoperatively (P＜0.05) . In addition, the VAS scores significantly decreased (P＜0.05) , while the mHHS and iHOT-12 scores significantly increased postoperatively compared with those before operation (P＜0.05) . Radiographically, the lateral center edge angle (LCEA) significantly reduced (P＜0.05) , the acetabu- lar index (AI) increased significantly (P＜0.05) , whereas the positive rates of cross sign and posterior wall sign significantly decreased at 6 months postoperatively and at the latest follow-up compared with those preoperatively (P＜0.05) . However, there were no significant chang- es in terms of T?nnis osteoarthritis grades and the positive rate of deep acetabular sign at 6 months postoperatively, or at the last follow-up compared with that preoperatively (P＞0.05) . [Conclusion] Acetabuloplasty under hip arthroscopy does significantly relieve the pain, im- prove function and achieve sound short-term clinical outcomes for mere pincer-type femoroacetabular impingement.

Abstract:[Objective] To evaluate the clinical efficacy of hip arthroscopy for the treatment of femoroacetabular impingement (FAI) ac- companied with external snapping hip (ESH) . [Methods] A retrospective analysis was performed on the patients who received hip arthros- copy in our hospital from January 2014 to June 2019. Among them, 25 patients who suffered from FAI accompanied with ESH were termed as the trial group and underwent arthroscopic intraarticular lesion management and iliotibial band release, while the other 25 patients who had mere FAI were named as the control group and received arthroscopic treatment of FAI lesions only. The perioperative, follow-up and imaging data were compared between the two groups. [Results] All the patients in both groups had operation finished successfully with no serious complications. Although the trial group consumed significantly longer operation time than the control group (P＜0.05) , there were no significant differences in total incision length, intraoperative X-ray exposure time, postoperative walking time, incision healing grade and hospital stay between the two groups (P＞0.05) . The VAS scores significantly decreased (P＜0.05) , whereas the mHHS score and iHOT-33 scores significantly increased in both groups at the latest follow-up lasted for more than 12 months compared with those preoperatively (P＜ 0.05) . In addition, the trial group got significant increase of hip adduction range of motion at straight leg, associated with that Ober signs be- came all negative at the latest interview (P＜0.05) . The trial group was significantly inferior to the control group in terms of VAS score and iHOT-33 score preoperatively (P＜0.05) , however which turned to be not statistically significant at the latest follow-up between them (P＞ 0.05) . Radiographically, the α angle and lateral center edge angle (LCEA) significantly reduced (P＜0.05) , while the femoral head neck off-set (FHNO) significantly increased in both groups at the last follow- up compared with those before surgery (P＜0.05) . At corresponding time points, there were no significant differences in aforesaid radiographic items between the two groups (P＞0.05) . [Conclusion] Hip ar- throscopy for simultaneous treatment of FAI and ESH has the advantages of less trauma and simple operation, and does achieve clinical out- comes similar to those with FAI alone.

Abstract:[Objective] To explore the reasons and clinical outcomes of revision hip arthroscopy. [Methods] From June 2015 to Decem- ber 2019, a total of 359 patients underwent hip arthroscopy in our hospital. Of them, 26 patients received revision hip arthroscopy, account- ed for 7.24%, for varying extent of pain and activity limitation before the revision surgery, which lasted for 3~36 months, (15.88±8.04) months on an average, after initial surgery. The revision hip arthroscopy was conducted to identify the cause of the symptoms and give ap- propriate treatment. [Results] As findings of revision hip arthroscopy among the 26 patients, residual deformities of femoroacetabular im- pingement (FAI) were seen in 21 patients, accounted for 80.77%; osteoid osteoma misdiagnosed as FAI in the primary operation in the other hospital was noted in 2 patients, accounted for 7.69%; recurrent synovial chondroma was found in 1 patient, accounted for 3.85%; heterotop- ic ossification was in 1 case, accounted for 3.85%; and recurrent pigmented villonodular synovitis was in 1 case, accounted for 3.85%. All the 26 patients had revision hip arthroscopy performed successfully without serious complications, such as hip dislocation, fracture, infec- tion and others. The follow-up period lasted for 12~26 months, with a mean of (17.54±4.24) months after the revision. The FADIR test, FABER test, and rolling test significantly improved in all the 26 patients at the latest follow-up compared with those before revision (P＜ 0.05) . In addition, the ROMs, including internal rotation at 0° of flexion, the external rotation at 0° of flexion, internal rotation at 90° of flex- ion, the external rotation at 90° and hip flexion, as well as the mHHS and the IHOT12 scores significantly increased (P＜0.05) , whereas the VAS score for pain significantly decreased at the latest follow-up compared with those before revision surgery (P＜0.05) . In term of radio- graphic evaluation, the α angle decreased and the femoral head-neck offset increased significantly at the latest follow-up compared with those before revision (P＜0.05) , whereas the LCEA remained unchanged in the 26 patients (P＞0.05) . [Conclusion] The main causes of revi- sion hip arthroscopy include residual FAI, misdiagnosis and recurrence of diseases. On the premise of correct preoperative diagnosis and mature surgical techniques, revision hip arthroscopy does still achieve good clinical outcome.

Abstract:[Objective] To compare the clinical efficacy of T-shaped capsulotomy versus transverse capsulotomy in hip arthroscopy for treatment of the cam-type femoroacetabular impingement syndrome (FAI) . [Methods] A retrospective study was done on 70 patients who underwent arthroscopic surgery for cam-type FAI from July 2017 to June 2018. Among them, 35 patients had the capsule opened by Tshaped incision (the T-shaped group) , while the remaining 35 patients received transverse capsulotomy (the transverse group) . The periop- erative, follow-up and imaging documents were compared between the two groups. [Results] All patients in both groups had operation per- formed successfully without serious complications, such as injuries to important blood vessel and nerve. The T-shaped group proved signifi- cantly superior to the transverse group in terms of operation time and intraoperative fluoroscopy frequency (P＜0.05) , although there were no significant differences in total incision length, intraoperative blood loss, time to recover ambulation and hospital stay between the two groups (P＞0.05) . All patients in both groups were followed up for more than 24 months, with an average of (26.66±2.10) months. The VAS scores significantly decreased (P＜0.05) , whereas the mHHS and iHOT scores significantly increased in both groups at the latest follow up compared with those preoperatively (P＜0.05) . The T-shaped group had lower VAS score than the transverse group at the latest follow up, but the difference was not statistically significant (P＞0.05) . However, the T-shaped group had significantly higher mHHS and iHOT-12 scores than the transverse group at the latest follow up (P＜0.05) . Radiographically, the α angle and lateral center edge angle (LCEA) signifi- cantly reduced (P＜0.05) , while the femoral head-neck offset (FHNO) significantly increased in both groups at the latest follow-up com- pared with those preoperatively (P＜0.05) . The T-shaped group proved significantly superior to the transverse group in terms of α angle and FHNO at the last follow-up (P＜0.05) , nevertheless, there was no a significant difference in LCEA between the two groups (P＞0.05) . [Conclusion] Hip arthroscopy by T-shaped capsulotomy does achieve considerably better clinical outcomes than that by transverse capsulotomy for treatment of cam-type femoroacetabular impingement.

Abstract:[Objective] To compare the clinical efficacy of hip arthroscopy for femoroacetabular impingement (FAI) in different ages. [Methods] A retrospective analysis was performed on 64 patients who underwent hip arthroscopy for FAI in our hospital from January 2015 to June 2018. According to the age of patients, 32 patients who aged more than 55 years were named as the mid-elderly group, while the remaining 32 patients who aged 18~40 years were termed as the young group. Perioperative, follow-up and imaging documenta- tions were compared between the two groups. [Results] All patients in both groups were successfully operated on without serious compli- cations. There were no statistically significant differences between the two groups in term of arthroscopic findings, including the types of FAI lesions, Outerbridge grades of the acetabulum and femoral head cartilage lesions, and the rate of labrum injury between the two groups (P＞0.05) . Patients in both groups were followed up for more than 24 months. The VAS scores significantly reduced in both groups, whereas the mHHS and iHOT-12 scores significantly increased at the latest follow-up compared with those before surgery (P＜ 0.05) . However, there were no significant differences in the abovementioned scores between the two groups at any corresponding time points (P＞0.05) . Radiographically, the α angle, femoral offset (FO) , and center edge angle (CE) were significantly improved in both groups at the latest follow-up compared with those preoperatively (P＜0.05) , whereas no statistically significant differences were noted in the abovesaid imaging items between the two groups at any corresponding time point (P＞0.05) . Additionally, the T?nnis classification for osteoarthritis remained unchanged in both groups at the latest follow-up compared with that preoperatively (P＞0.05) , which was not sig- nificantly different between the two groups at any matching time point (P＞0.05) . [Conclusion] As long as the indications are appropri- ately selected, hip arthroscopy for FAI in the patients who are old more than 55 years still achieve sound clinical outcomes comparable to those in younger patients.

Abstract:[Objective] To investigate the clinical outcomes of hip arthroscopy for femoroacetabular impingement (FAI) accompanied borderline developmental dysplasia of the hip (bDDH) . [Methods] A retrospective study was conducted on 232 patients who underwent hip arthroscopy for FAI in our hospital from September 2017 to December 2019. Of them, a total of 22 patients who were under 50 years old, and met the criteria for diagnosis of bDDH, with lateral center edge angle (LCEA) between 18° and 25° were enrolled into this study. All the 22 patients underwent arthroscopic labrum repair, femoroplasty and capsule tightened suture. [Results] As arthroscopic findings, all the 22 patients had labral tear in different extents and cam-like malformations at the femoral head and neck junction, which were treated accordingly. All the 22 patients were successfully operated on without any important vascular or nerve injury. The follow-up period lasted for 15-39 months, with a mean of (22.29±6.78) months. The VAS scores significantly decreased (P＜0.05) , while the mHSS and iHOT-12 scores significantly increased at the latest follow up compared with those preoperatively (P＜0.05) . At the latest follow-up, the mHHS score in the male (13/22) were significantly higher than that in the female (9/22) (P＜0.05) . Radiographically, the LCEA and α angle decreased significantly (P＜0.05) , while T?nnis angle and FHNO significantly increased compared with those preoperatively (P＜0.05) . The T?nnis os- teoarthritis classification remained unchanged in all patients at the last follow-up. [Conclusion] The proportion of FAI accompanied with bDDH is 9.48% in all FAI patients. Arthroscopic labrum repair, femoroplasty combined with capsular tightened suture does achieve satis- factory short-term outcomes for this condition.

Abstract:[Objective] To explore the clinical efficacy of arthroscopic debridement and drilling decompression combined with postop- erative extracorporeal shock wave therapy for early- stage femoral head necrosis. [Methods] A retrospective study was done on a total of 422 adult patients (642 hips) who received treatment for early-stage femoral head necrosis in our hospital from January 2010 to January 2018. All the patients underwent hip arthroscopic debridement and drilling decompression of the femoral head, and then extracorporeal shockwave therapy postoperatively. [Results] All the 422 patients (642 hips) were successfully operated on without serious complications during perioperative period, and with no obvious adverse reactions during ESW treatment. The follow-up period lasted for more than 24 months. Of them, 16 patients (18 hips) turned to receive total hip arthroplasty due to femoral head collapse in 8~24 months after primary op- eration, with an average of (14.33±6.21) months, accounting for 2.84%. From time point preoperatively to 12 months postoperatively, the VAS scores in resting state and during walking were significantly decreased (P＜0.05) , while flexion-extension ROM, internal-external rota- tion ROM and adduction- abduction ROM, as well as Harris score significantly increased (P＜0.05) . However, the improvements in the above item had slight loss at the latest follow-up compared with those at 12 months postoperatively, whereas which were not statistically sig- nificant (P＞0.05) . Radiographically, significant improvements were noticed in terms of ARCO classification, femoral head bone edema, and intraarticular effusion from the time preoperatively to 12 months postoperatively (P＜0.05) , whereas the T?nnis classification remained un- changed (P＞0.05) . However, there were no significant changes in these imaging parameters at the latest follow-up compared with those at 12 months postoperatively (P＞0.05) . [Conclusion] The arthroscopic debridement and drilling decompression combined with postoperative shock wave therapy might reverse in some extent, or delay the progression of femoral head necrosis, do achieve satisfactory clinical out- comes.

Abstract:Femoroacetabular impingement syndrome (FAI) is one of the common clinical painful diseases, which is caused by the ab- normal impingement between the femoral head-neck junction and the acetabular rim due to the abnormal anatomical structure. In recent years, minimally invasive surgery, especially hip arthroscopy, has developed rapidly, while the understanding of FAI has been deepening, and the concept of diagnosis and treatment has changed greatly. At present, hip arthroscopy, a minimally invasive surgery, has become the mainstream technique for the treatment of FAI with continuous improvements of the clinical follow-up results and prognosis. This article re- views the new diagnostic methods, arthroscopic treatment, efficacy and complications for femoroacetabular impingement.

Abstract:Hip arthroscopy has the advantages of less trauma, quick postoperative recovery, light pain and fewer complications. In re- cent years, hip arthroscopy and its surgical techniques are constantly improved with the rapid development of specific instrumentations, and the indications for clinical application are constantly expanding. It is gradually replacing the traditional open surgery and become the first choice for the treatment of early and middle stage hip injuries and diseases, despite of the fact that clinical outcomes in some patients re- main unsatisfactory. In this paper, choice of indications and contraindications for hip arthroscopy were summarized.

Abstract:Sports injury seriously affects sports training performance, occupational health and brings high economic burden. Joint dys- function, muscle weakness, core instability and core muscle group imbalance in the kinetic chain leads to a higher probability of sports inju- ry. The study on the role of gluteus muscle in the core stability and the waist-hip-knee kinetic chain has become a hot topic in the preven- tion and treatment of sports injury in recent years. Gluteal muscle activation exercise is an effective intervention for sports performance and injury prevention. In this paper, the risk factors of sports injury, relationship between gluteal muscle and sports injury, and gluteal muscle activation methods were reviewed, in addition, the mechanism of the failure of core stability and the imbalance of the waist-gluteal-knee ki- netic chain induced by poor gluteal muscle was analyzed. The relationship between gluteal muscle and sports injury was clarified to provide a reference for the decision-making of clinical and rehabilitation physicians.

Abstract:[Objective] To introduce the surgical technique of portal establishment without fluoroscopy and traction initially for hip ar- throscopy. [Methods] Under general anesthesia, the patient was placed on the traction operating table supine with 15 degrees of internal ro- tation, 15 degrees of adduction and 15 degrees of forward flexion. The body surface marking was routinely performed. Under the condition of no fluoroscopy and no traction initially, a 5 mm incision was made at the MA portal marking point, a forceps was used to separate the soft tissue to the capsule, and then a semi-open channel was inserted. A puncture needle was penetrated into the peripheral compartment of the hip. With exchange of the guide wire, cannulated rod and arthroscopic cannula, the arthroscope was inserted into the compartment. As the compartment was dilated with irrigation, it was visualized by the arthroscope. After that, the affected hip was placed straightly under trac- tion with 15° of internal rotation. As the traction force increased, the joint space was gradually retracted under direct vision. When the space was opened to 8~10 mm, the arthroscope was transferred into the central compartment, and other portals were established under ar- throscopic vision, and the surgical operation was completed as usual. [Results] From October 2018 to September 2020, a total of 242 pa- tients (270 hips) underwent hip arthroscopy in our hospital. Of them, 166 hips had portal established with the abovementioned new tech- nique, while the remaining 104 hips had portal established with the conventional technique under traction and fluoroscopy initially. The time consumed for portal establishment was (5.87±2.49) min in the new technique group, whereas (7.59±4.07) min in the conventional group, which was statistically significant between the two groups (P＜0.05) . [Conclusion] Compared with the conventional technique, this new technique does reduce radiographic radiation and traction injury, and shorten the operation time.

Abstract:[Objective] To introduce the surgical technique and preliminary clinical outcomes of arthroscopic constrictive capsular su- ture for hip instability. [Methods] One patient received arthroscopic constrictive capsular suture for hip instability. During the operation, ar- throscopic exploration revealed that the labrum was intact, and inflammatory changes were found above the labrum, which was considered to be caused by hip instability. As the cause of hip joint pain was determined, the anterior lateral joint capsule, involving iliofemoral liga- ment, was arthroscopically sutured with 3 stitches outside-in to constrict the hip. [Results] The patients had hip arthroscopy performed smoothly without serious complications. VAS score decreased from 6 preoperatively to 0 at 3 months postoperatively, while the Harris score increased from 56 to 90, and the iHOT12 score increased from 60 to 110. The patients got satisfactory functional recovery. [Conclusion] This arthroscopic constrictive capsular suture has benefits of minimal iatrogenic trauma, simple operation manipulation and few complica- tions, does achieve satisfactory preliminary outcome.

Abstract:[Objective] To evaluate the clinical outcome of hip arthroscopy for labral amorphous calcification. [Methods] From January 2013 to October 2017, 15 patients who was diagnosed of labral amorphous calcification on images were enrolled in this study, and all re- ceived hip arthroscopy. The clinical and imaging data of the patients were evaluated. [Results] Intraoperatively, arthroscopic examination showed that the calcified lesion of labrum was located at 11-3 clock points in front or above the acetabulum. The lesion volume was signifi- cantly positively related to the preoperative VAS score (P＜0.05) , whereas significantly negatively related to the preoperative mHHS and iHOT-12 scores (P＜0.05) . Among the 15 patients, 5 case were associated with pincer- type impingement, 2 with cam- type FAI, 5 with mixed FAI, and only 3 were simple labral calcification. The VAS scores significantly decreased (P＜0.05) , while the mHHS and iHOT-12 scores significantly increased at 12 and 24 months postoperatively compared with those before surgery (P＜0.05) . Radiographically, the α angle and lateral center edge angle (LCEA) significantly reduced (P＜0.05) , while the femoral head neck offset (FHNO) significantly in- creased after surgery compared with those preoperatively (P＜0.05) . No recurrence of labral calcification, and no obvious hip degeneration were seen in anyone of the 15 patients. [Conclusion] Hip arthroscopy is an effective method for the treatment of labral amorphous calcifica- tion. The size of calcification lesion might be one of the influencing factors of preoperative symptoms and function.

Abstract:[Objective] To explore the clinical outcomes of arthroscopic debridement and drainage with continuous suction irrigation for hip brucellosis. [Methods] From February 2009 to December 2018, 8 patients with brucella arthritis of the hip were arthroscopically treated in Department of Orthopedics, General Hospital of CPLA. Synovial resection, debridement and catheterization were conducted dur- ing arthroscopy. After that, continuous suction irrigation was maintained to the inflammatory reaction subsided. In addition, doxycycline combined with rifampicin, or streptomycin was given for 1.5~3 months. [Results] All the 8 patients were successfully operated without seri- ous complications. The irrigation- drainage tubes were removed at (9.5±2.21) days on average. The positive rate of brucella proved of 8/8 (100%) in bacterial culture, and 8/8 (100%) in pathological observation. All patients were followed up for more than 24 months. No infec- tion recurrence and revision surgery occurred in anyone of them to the latest follow-up. The VAS scores decreased significantly (P＜0.05) , while the mHHS score increased significantly over time in the 8 patients (P＜0.05) . There were no significant changes in radiographically measured hip space at the latest follow-up compared with those preoperatively (P＞0.05) . The ESR and CPR were significantly decreased postoperatively compared with those before operation (P＜0.05) , and remained within the normal range at 12 and 24 months postoperatively. [Conclusion] Arthroscopic debridement and drainage with continuous suction irrigation does effectively treat hip brucellosis.

Abstract:[Objective] To investigate the common complications of hip arthroscopy and its prevention and treatment. [Methods] From January 2017 to January 2020, a total of 365 patients underwent hip arthroscopy in our hospital, and their complications were analyzed. [Results] No major complications occurred in the 365 patients who underwent primary hip arthroscopy. The incidence of secondary complica- tions was 19.18%, involving numbness of perineal area and lower limb (5.75%) , cartilage injury (4.93%) , penetrating the labrum (2.19%) and foreign loose body (2.74%) . In addition, other rare complications include perfusion into the peritoneal septum and radiofrequency skin burns. [Conclusion] Most of the complications of hip joint were not serious, the number of cases gradually decreased with experience accu- mulation, whereas which still should be paid attention to.

Abstract:[Objective] To investigate the clinical outcomes of hip arthroscopy for femoroacetabular impingement (FAI) in adolescents. [Methods] From January 2016 to September 2018, 21 adolescent patients underwent hip arthroscopic surgery for FAI. The clinical and im- aging data were evaluated. [Results] As findings of arthroscopic examination, 7 case were of cam-type impingement, 2 were of pincer-type and 12 were mixed-type, and 19 cases were accompanied with impingement of the anteroinferior iliac spine among the 21 patients, whereas all 21 cases were accompanied with labrum injury. Corresponding arthroscopic treatment was performed to the lesions with no complica- tions, such as nerve injury, intraarticular infection or symptomatic thrombosis. The VAS scores significantly decreased (P＜0.05) , while the mHHS and iHOT-12 scores significantly increased at 12 and 24 months postoperatively compared with those before surgery (P＜0.05) . Ra- diographically, the α angle and lateral center edge angle (LCEA) significantly reduced (P＜0.05) , while the femoral head neck offset (FH- NO) significantly increased (P＜0.05) , and there was no significant change in LCEA (P＞0.05) postoperatively compared with those before operation. Up to the latest follow-up, all the 21 patients had no obvious hip degeneration. According to Oxford method, bone growth and de- velopment remained normal after surgery in all the adolescents. [Conclusion] Hip arthroscopy is an effective treatment for FAI in adoles- cents without affecting bone growth and development.

Abstract:[Objective] To retrospectively analyze the author's initial cases of hip arthroscopy, and summarize the learning curve expe- rience for portal establishment, so as to provide a reference for the beginners. [Methods] From May 2016 to February 2019, 50 patients had hip arthroscopy performed consecutively, and the time consumed for establishment of anterolateral approach (AL) and mid- anterolateral portal (MA) were recorded. [Results] With the accumulation of cases, the time required for AL establishment decreased significantly (P＜ 0.05) , which in term of the learning curve tended to be stable after 20 initial cases, and became not statistically significant (P＞0.05) . In ad- dition, the elapsed time for MA establishment decreased significantly as case number accumulation (P＜0.05), however, the learning curve leveled off after the 35th case (P＞0.05) . [Conclusion] The establishment of portals is one of the key points of hip arthroscopy learning, and the establishment of anterolateral portal is relatively easy, while the mid-anterolateral portal is difficulty, requiring 35 cases to complete the learning curve.

Abstract:[Objective] To explore the role of hip brace in hip arthroscopic labrum repair. [Methods] A total of 70 patients who under- went arthroscopic acetabular labrum repair from March 2019 to October 2019 were enrolled in this study and randomly divided into two groups. Among them, 35 patients were given hip brace postoperatively (the HB group), whereas the other 35 patients had no hip brace used (the non-HB group) . The compliance to active rehabilitation exercises and extent of pain were compared between the two groups during hospitalization. [Results] Compliance to active rehabilitation exercises significantly increased over time postoperatively in both groups (P＜ 0.05) , which in the HB group proved significantly superior to the non-HB group at 1, 2 and 3 days postoperatively (P＜0.05) . Regarding to pain, the VAS score significantly decreased in both groups as time went after operation (P＜0.05) , and the HB group was marked significant- ly lower VAS score than the non-HB group at 1, 2 and 3 days postoperatively (P＜0.05) . [Conclusion] Proper application of hip braces after hip arthroscopic acetabular labrum repair is beneficial to the rehabilitation exercise of the hip and relieve pain.

Abstract:[Objective] To investigate the clinical outcomes of hip arthroscopy for treatment of acetabular paralabral cyst. [Methods] From January 2016 to October 2018, a total of 16 patients underwent hip arthroscopy for acetabular paralabral cyst, and their clinical and imaging data were evaluated. [Results] During arthroscopy, all the 16 patients proved of acetabular paralabral cyst, and 14 cases of them had cam-type femoroacetabular impingement (FAI) found, accounting for 87.5%. All patients underwent cysts resection and labral suture, and those with FAI underwent cam osteophyte resection. The 16 patients had no serious complications, and were followed up for more than 24 months. The VAS scores were significantly decreased (P＜0.05) , while mHHS and iHOT-12 scores significantly increased at 12 and 24 months postoperatively compared with those before surgery (P＜0.05) . Radiographically, the α angle and lateral center edge angle (LCEA) significantly reduced (P＜0.05) , while the femoral head neck offset (FHNO) significantly increased (P＜0.05) , and there was no significant change in LCEA (P＞0.05) postoperatively compared with those before operation. Up to the latest follow-up, nobody of them had recurrence of labral cysts and obvious hip degeneration found on images. [Conclusion] Hip arthroscopy is an effective method for the treatment of ace- tabular paralabral cyst, which does significantly improve the symptoms and function of the hip.