Innate Immunity in the Development of Connective Tissue Dysplasia: Pilot Study in Children with Congenital Hip Dislocation

Introduction: Observing and treatment of hip dysplasia in children have always been in the sphere of interest of modern molecular medicine. The role of molecular factors in the formation of connective tissue dysplasia in children is considered crucial for such multisystem disorders, and connective tissue dysplasia progressing involves immune system parameters and biochemical markers. The aim of this work was to establish the relationship between immune status indicators and biochemical markers of connective tissue using bioinformatics and modeling methods. Materials and Methods: 27 patients with congenital hip dislocation, admitted to the University Clinic of Privolzhsky Research Medical University, Department of children orthopedics for surgical treatment, were examined. Determination of 10 blood parameters was conducted by modern biochemical and immunological methods. Statistica 12.0 software from StatSoft was used for statistical data processing. Methods of nonparametric statistics were used since the samples in the control group partially follow the normal distribution. Correlation methods and regression modeling methods were used to evaluate the relationship of indicators. Results and Conclusion: In our investigation we have shown the presence of statistical and mathematical interactions between the parameters of innate immunity and indicators of connective tissue metabolism. The leading role of the immune system in the development of pathologies associated with connective tissue dysplasia is assumed. In further investigations it is necessary to clarify the role hypoxia in HIF-1 stimulated control of skeletal dysplasia, collagen modification, connective tissue dysplasia development.

Neglected congenital bilateral knee dislocation treated by quadricepsplasty with semitendinosus and sartorius transfer:A case report

BACKGROUND Congenital knee dislocation(CKD)is a rare condition,which accounts for 1%of congenital hip dislocations.It can present as an isolated condition or coexist with other genetic disorders.Treatment options include serial casting,percutaneous quadriceps recession,and V-Y quadricepsplasty(VYQ).The pathogenesis and hereditary patterns of CKD are not fully understood,with most cases being familial.CKD is usually managed immediately after birth.However,in this report,the patient was neglected for 2 years.CASE SUMMARY A 2-year-old girl with bilateral CKD after birth presented to our hospital after failed serial casting;the patient had seizures and limited access to healthcare because of her family’s low socioeconomic status.Her birth was noted for a breech presentation accompanied by oligohydramnios.The delivery took a long time,requiring immediate medical interventions.As an infant,she had chronic diseases,including a small patent ductus arteriole,multicystic dysplastic kidney disease,and epilepsy.She was found to have a bilateral knee dislocation of approximately-90°on hyperextension.A multidisciplinary team was involved,and medical care was optimized.She underwent VYQ plus semitendinosus and sartorius transfer.After four postoperative follow-ups,her knees were regaining mobility,and she could walk for 2-3 steps without assistance.CONCLUSION This report highlights the importance of early intervention and recommends extensive studies of the management in similar cases.

Postoperative redislocation of the hip in a patient with congenital insensitivity to pain with anhidrosis： A case report and review of literature

Pelvic osteotomy is commonly used to adjust acetabula dysplasia for congenital dislocation of the hip, whereas congenital insensitivity to pain with anhidrosis(CIPA) is a rare hereditary disease that often has the characteristics of joint development deformity and easy fracture. This article reports the case involving a CIPA patient who was surgically treated by Chiari pelvic osteotomy and proximal femoral rotation osteotomy for congenital dislocation of the left hip joint and was provided long-term follow-up for redislocation and bilateral femoral head absorption.

Congenital Dislocation of the Hip in Children between the Ages of One and Three: Open Reduction and Modified Salter Innominate Osteotomy Combined with Fibular Allograft

Background: Innominate osteotomy procedures have been widely used as an integral component of combined surgery to treat developmental dysplasia of the hip in children. Autograft concern is further supported by authors who suggest the routine use of internal fixation. Problems such as graft extrusion, rotation and absorption, leading to loss of acetabular correction, were often noted in cases previously treated at our National Hospital for Pediatrics. This retrospective study reviewed the radiographic results of this treatment protocol in 106 hips developmental dislocated hips which met our inclusion criteria. The efficacy of this method to achieve and maintain a well covered and stable hip was the main objective of the study. Methods: This retrospective study reviewed the radiographs of 106 hips presenting with developmental dislocation which were treated by modified Salter’s innomiate osteotomy and using a fibular allograft as the interposition material. Dislocations of the hip were graded using the T?nnis system. Measurement of the acetabular index (AI) was the main variable. The minimum follow up period was 2 years. Possible complications such as loss of acetabular correction, hip redislocation, graft extrusion or resorption, the need for osteotomy internal fixation, delayed or non union, infection or avascular necrosis (AVN) were documented in this series. Results: Between January 2004 and December 2008, 106 surgeries were performed in 95 patients. Sixty-three (86.3%) of the patients were girls and ten (13.7%) were boys, thirteen patients (13.7%) were between twelve and eighteen months old at the time of the operation, the remaining eighty-two (86.3%) patients being between eighteen and thirty-six months old, with the mean age of 22.6 months at the time of surgery. There were eleven (11.6%) patients who had bilateral dislocation. Eighty-four (88.4%) patients were affected unilaterally. The right hip was involved in seventeen (17.9%) and the left hip in sixty-seven (70.5%) cases. T?nnis system Type 3 was in 34 hip (32.1%), and Type 4 was in 72 hip (67.9%). All patients combined open reduction and modified Salter’s innomiate osteotomy, inserting a fibular allograft as the interposition material. Acetabular index was improved, preoperation was 42.95°, and latest follow-up 19.15°, concentrical acetabulum 93.7%. All of the fibulat allografts were completely incorporated mean 14 weeks (range, 12 weeks - 17 weeks) post-surgery. There were five (4.7%) redislocation and subluxation, three AVN (2.8%) and five (4.7%) coxa magna Without graft infections, none of the osteotomies required internal fixation for stability. Final results: Excellent 70 (66.0%), Good 29 (27.4%), Fair 2 (1.9%), Poor 5 (4.7%). Conclusion: Open reduction and modified Salter’s innomiate osteotomy allow interposition material by fibular allografting with a short operative incision, renders excellent osteotomy stability that eliminates the need for internal fixation. Surgical technique are safe and effective for Children between twelve and thirty-six months old.

Trochanteric Fracture of a Congenital/Developmental Dislocation of the Hip in an Elderly Woman: A Case Report

An 87-year-old woman with a residual dislocated hip suffered a trochanteric fracture on the ipsilateral side. The fracture was treated by open reduction and internal fixation surgery with good results. To treat a proximal femoral fracture of the residual dislocated hip in an elderly patient, the patient’s overall status, pre-fracture ability, hip joint configuration, and fracture pattern should be considered.

Lessons learned from study of congenital hip disease in adults

Orthopaedic surgeons specialising in adult hip reconstruction surgery often face the problem of osteoarthritis secondary to congenital hip disease(CHD). To achieve better communication among physicians,better treatment planning and evaluation of the results of various treatment options,an agreed terminology is needed to describe the entire pathology. Furthermore,a generally accepted classification of the deformities is necessary. Herein,the authors propose the use of the term "congenital hip disease" and its classification as dysplasia,low dislocation and high dislocation. Knowledge of the CHD natural history facilitates comprehension of the potential development and progression of the disease,which differs among the aforementioned types. This can lead to better understanding of the anatomical abnormalities found in the different CHD types and thus facilitate preoperative planning and choice of the most appropriate management for adult patients. The basic principles for improved results of total hip replacement in patients with CHD,especially those with low and high dislocation,are: Wide exposure,restoration of the normal centre of rotation and the use of special techniques and implants for the reconstruction of the acetabulum and femur. Application of these principles during total hip replacement in young female patients born with severe deformities of the hip joint has led to radical improvement of their quality of life.

Observation of the effects of three methods for reducing perineal swelling in children with developmental hip dislocation

BACKGROUND Developmental dysplasia of the hip is a developmental abnormality of the hip joint that results from hypoplasia during birth and continues to deteriorate after birth.AIM To observe the effects of magnesium sulfate wet compress,iodophor wet compress,and ice compress on reducing postoperative perineal swelling in children with developmental hip dislocation to provide effective nursing interventions in the clinic.METHODS A total of 120 children with hip dislocation after surgery in a third-class A hospital from January 2018 to January 2020 were randomly divided into four groups,the magnesium sulfate wet compress group,iodophor wet compress group,ice compress group and the control group.Data such as height,weight,age,duration of surgery,intraoperative blood loss,postoperative body temperature,swelling duration,pain score,and incidence of blisters were collected and analyzed.RESULTS There were no significant differences in height,weight,age,duration of surgery,intraoperative blood loss,and postoperative body temperature among the four groups of children.Statistical differences were observed between the intervention groups and the control group(P<0.05).CONCLUSION All three methods significantly reduced postoperative perineal swelling in children with developmental hip dislocation,reduced the duration of postoperative perineal swelling,reduced pain,and improved the quality of care.

Safety and efficacy of surgical hip dislocation in managing femoral head fractures: A systematic review and meta-analysis

BACKGROUND Femoral head fractures(FHFs)are considered relatively uncommon injuries;however,open reduction and internal fixation is preferred for most displaced fractures.Several surgical approaches had been utilized with controversial results;surgical hip dislocation(SHD)is among these approaches,with the reputation of being demanding and leading to higher complication rates.AIM To determine the efficacy and safety of SHD in managing FHFs by reviewing the results reported in the literature.METHODS Major databases including PubMed,Embase,Web of Science,and Cochrane Central Register of Controlled Trials were searched to identify studies reporting on outcomes of SHD utilized as an approach in treating FHFs.We extracted basic studies data,surgery-related data,functional outcomes,radiological outcomes,and postoperative complications.We calculated the mean differences for continuous data with 95%confidence intervals for each outcome and the odds ratio with 95%confidence intervals for binary outcomes.P<0.05 was considered significant.RESULTS Our search retrieved nine studies meeting our inclusion criteria,with a total of 129 FHFs.The results of our analysis revealed that the average operation time was 123.74 min,while the average blood loss was 491.89 mL.After an average followup of 38.4 mo,a satisfactory clinical outcome was achieved in 85%of patients,ranged from 30%to 86%,with avascular necrosis,heterotopic ossification,and osteoarthritis being the most common complications occurring at an incidence of 12%,25%,and 16%,respectively.Trochanteric flip osteotomy nonunion and trochanteric bursitis as a unique complication of SHD occurred at an incidence of 3.4%and 3.8%,respectively.CONCLUSION The integration of SHD approach for dealing with FHFs offered acceptable functional and radiological outcomes with a wide range of safety in regards to the hip joint vascularity and the development of avascular necrosis,the formation of heterotopic ossification,and the development of posttraumatic osteoarthritis;however,it still carries its unique risk of trochanteric flip osteotomy nonunion and persistent lateral thigh pain.

Corrections in alpha angle following two different operative approaches for CAM-type femoral acetabular impingement-Ganz surgical hip dislocation vs anterior mini-open

BACKGROUND Femoroacetabular impingement(FAI)is a predisposing factor for secondary osteoarthritis of the hip joint.The two extensively described impingement mechanisms of FAI are CAM and Pincer-type.Initially managed conservatively,operative intervention should be offered to the persistently symptomatic patient.The measurement of the alpha angle is considered a standard method of assessing the severity of pathology in Cam-type FAI on pre-operative plain radiographs.The radiological correction of the alpha angle has not been previously compared between different surgical approaches.We hypothesize that there is no difference in alpha angle correction between Ganz surgical hip dislocation and the anterior mini-open approach.AIM To compare the magnitude of alpha angle correction achieved by using the Ganz surgical hip dislocation and the anterior mini-open approach.METHODS This is a retrospective study assessing seventy-nine patients identified in a 5-year period.These patients had preoperative radiographic evidence of FAI and underwent surgery by a single surgeon at our institution,a tertiary care center.Patients with missing radiographic documentation,radiographs with insufficient quality which then precluded accurate measurement of the angleα,a diagnosed congenital condition,isolated type II pathology(Pincer),and history of prior surgery were excluded from the study.Either the Ganz surgical hip dislocation or the anterior mini open approach was used.Postoperative radiographic evaluation of the alpha angle between the two surgical methods was done and corrected for age and gender using two-sample t-tests and Chi-square analyses.RESULTS A total of 79 patients met the inclusion and exclusion criteria.Forty-seven males(mean age of 35.3,range 16-53)and 32 females(mean age 36.7,range 16-60)were enrolled.Forty-seven patients underwent the anterior mini-open approach,and 32 underwent the Ganz surgical hip dislocation.There were no significant differences in age between the two surgical groups or in pre-and post-operative alpha angles based on patient gender.The mean pre-operative alpha angle for the Ganz surgical hip dislocation group was 88.0 degrees(SD 12.3)and 99.4 degrees(SD 7.2)for the anterior mini-open group.Mean post-operative angles were 49.9 degrees(SD 4.3)for the Ganz surgical hip dislocation and 43.8(SD 4.3)degrees for the anterior mini-open group.There was a statistically significant difference in patient’s pre-operative and post-operative angles(P=0.000)with both surgical approaches.CONCLUSION Statistically significant decreases in alpha angle were noted for both surgical techniques,with larger decreases seen in the anterior mini-open group.

Combined bilateral asymmetric hip dislocation and anterior shoulder dislocation

BACKGROUND:Traumatic bilateral hip dislocation is a rare condition.Anterior shoulder dislocation combined with this condition is even a rare occurrence.A 57-year-old man had bilateral asymmetric hip dislocation with a posterior wall fracture of the left acetabulum associated with right shoulder anterior dislocation caused by falling down from a cherry tree.Traumatic hip dislocation and anterior shoulder dislocation represent a true orthopedic emergency.METHODS:Closed reduction was performed immediately for three of the dislocated joints.Posterior wall fracture of the left acetabulum was treated with open reduction and internal fixation by screws.Because of the severity of associated complications like aseptic necrosis or posttraumatic osteoarthritis,efforts were made to ensure prompt diagnosis,therapy and prognosis.RESULTS:The patient was successfully treated by open reduction and internal fixation of the left acetabulum,and discharged from the hospital.CONCLUSION:Traumatic asymmetric hip dislocation and anterior shoulder dislocation are an orthopedic emergency and early diagnosis with immediate reduction of the dislocation is the key determinants of excellent result of treatment.

A Case of Simultaneous Total Knee Arthroplasty in Congenital Dislocation of the Patella

The gonarthrosis with congenital dislocation of the patella is rare condition. This paper will report about total knee arthroplasty (TKA) for the valgus knee with bilateral congenital dislocation of the patella. A 52-year-old woman presented to our hospital with progressive pain in bilateral knees. Both knee showed severe valgus deformity and lateral dislocation of the patella. Anteroposterior weight-bearing radiographs showed osteoarthritic changes in the lateral compartment with 7 valgus deformity at the right and 15 at the left. A bilateral TKA with cruciate retained components (NAKASHIMA FINE) was performed. Good tracking of the patella was achieved by using a lateral parapatellar approach and vastus medialis plication. There are no normative guidelines of operative procedure about TKA for osteoarthritis of valgus knee with congenital dislocation of the patella. With some referencing to current literature, strategies to good patella tracking are discussed.

Closed reduction of hip dislocation associated with ipsilateral lower extremity fractures:A case report and review of the literature

BACKGROUND Traumatic hip dislocation usually occurs following high-velocity trauma.It is imperative that the dislocation be reduced in a timely manner,especially in a closed manner,as an orthopedic emergency.However,closed reduction can hardly be achieved in patients who also have ipsilateral lower extremity fractures.Herein,we focus on hip dislocation associated with ipsilateral lower extremity fractures,excluding intracapsular fractures(femoral head and neck fractures),present an early closed hip joint reduction method for this injury pattern,and review the literature to discuss the appropriate closed reduction technique for this rare injury pattern.CASE SUMMARY We report a case of a 37-year-old male who sustained a left acetabular posterior wall fracture,an ipsilateral comminuted subtrochanteric fracture and dislocation of the hip.The hip dislocation was reduced urgently in a closed manner using the joy-stick technique with a T-shaped Schanz screw.The fractures were reduced and fixed as a 2nd-stage surgery procedure.At the 17-month postoperative follow-up,the patient had full range of motion of the affected hip.CONCLUSION Closed reduction of a hip dislocation associated with ipsilateral lower extremity fractures is rarely achieved by regular maneuvers.Attempts at closed reduction,by means of indirectly controlling the proximal fracture fragment or reconstructing the femoral leverage rapidly with the aid of various external reduction apparatuses,were shown to be effective in some scenarios.Mandatory open reduction is indicated in cases of failed closed reduction,particularly in irreducible dislocations.

Irreducible Posterior Hip Dislocation with Associated Isolated Comminuted Greater Trochanter Avulsion Fracture Treated with Universal Locking Trochanteric Stabilization Plate: A Rare Combination of Hip Injury

Posterior hip dislocation with greater trochanter fracture is an uncommon injury pattern in the acute trauma patient. Frequently associated injury includes a combination of hip dislocation with posterior wall of acetabulum, head of femur fracture, intertrochanteric fracture and even the most severe type of combined acetabular fracture. We report a 42-year-old man post traumatic bilateral hip injuries with irreducible posterior hip dislocation and associated isolated greater trochanteric fracture successfully managed with open reduction and fixation of greater trochanter with universal locking trochanteric stabilization plate.

Asymmetrical traumatic bilateral hip dislocations with hemodynamic instability and an unstable pelvic ring: Case report and review of literature

Simultaneous anterior and posterior traumatic dislocations of both hips are very rare. Only 33 cases have been previously reported in the English language literature. Although they were all due to high-energy injuries, they were hemodynamically stable and had a stable pelvic ring. We report a unique case of asymmetrical hip dislocations with an unstable pelvic ring and hemodynamic instability. A 40-year-old man was injured in a high-energy motor vehicle accident. He was hemodynamically unstable when he presented in the emergency department. Radiolographs showed asymmetrical dislocations of both hips with an unstable pelvic ring. Under general anesthesia, he had closed reduction of the dislocations of both hips, followed by temporary stabilization with an external fixator. Transcatheter arterial embolization was performed to stop active pelvic bleeding. Delayed open reduction and internal fixation was performed 12 d later with anterior and posterior plates. The patient recovered well with an uneventful post-operative course. Asymmetrical bilateral hip dislocations with pelvic ring instability caused by trauma, as presented in this case, is very rare and potentially life threatening. Prompt treatment can give a good outcome.

Neglected traumatic hip dislocation: Influence of the increased intracapsular pressure

AIM To investigate that the increased intracapsular pressure, during the delay period, can interrupt the blood flow to the femoral head.METHODS An observational retrospective study included a group of 17 patients with traumatic hip dislocation, their ages at time of injury averaged 26(range from 3 to 70) years. Outcomes were assessed clinically and radiographically at a period averaged 11.5(range from 4 to 20) years.RESULTS Minor trauma caused dislocation in seven and severe trauma in ten patients. All dislocations were posterior, six isolated dislocation and 11 were associated with other injuries. The negligence period averaged 2.5(ranged from 1 to 4) d. At the latest visit, the radiography revealed normal hip in 11 and avascular necrosis(AVN) in six patients. Clinically, eight patients were rated as excellent, three good, three fair and three poor.CONCLUSION We believe the factors that contribute to increased intracapsular pressure also increase the influence of delayed reduction toward the development of AVN.

Profile of Traumatic Hip Dislocations in a West African Teaching Hospital

Purpose: Traumatic hip dislocations (THD) are rarely reported from developing countries. The aim of the current study is to describe the trauma, the presentation, the treatment and the outcome patterns of THD received in the trauma unit of an emergency department (ED) in west Africa. Patients and Methods: A retrospective ongoing study from 2008 to 2014 was performed at the ED. All patients over 15 years with an unreduced THD and an anteroposterior pelvic radiograph were studied. Data were collected and analyzed by means of a statistical software. Results: A total of 50 THD were included in the study. We found an average of seven dislocations per year with a mean age of 36 years mainly males (n = 37). Road traffic accidents by motorcycle (n = 20) were the common circumstance of trauma. Forty-five extra-pelvic THD were diagnosed. According to the Bigelow classification, THD were classified posterior (n = 33), anterior (n = 10) and irregular (n = 2). Associated acetabular fractures (n = 36), ipsilateral lower limb fractures (n = 10) and sciatic nerve palsy (n = 2) were also found. The THD cases were treated by closed reduction (n = 34), open reduction (n = 6) and Girdlestone procedure (n = 1). The outcome after 16 months showed 21 good and excellent functional results and one death. The short term complications were post traumatic arthritis (n = 10) and osteonecrosis (n = 2). Conclusion: The THD occurrences are important in our emergency department. They are characterized by the place of motorcycle accidents and by the delayed reduction due to hospital’s locations and numbers and beliefs. A reduction before four hours, an earlier rehabilitation, a non-use of traction and a short hospitalization time below 14 days gave better results.

Unusual Posterior Traumatic Hip Dislocations at Yopougon/Abidjan Teaching Hospital

Traumatic dislocation of the hip is quite rare and accounts for 2% - 5% of all dislocations. We report on a case of a bilateral posterior hip dislocation associated with symmetric acetabular fracture and two cases of infracotyloid dislocation. The report included 2 men and one woman. The mean age of patients was 33 years. All dislocations followed a road traffic accident. Non-operative closed reduction was achieved within 19 hours of admission. The average follow-up time was 15 months. The hips were stable, mobile, and painless;and there was no radiographic sign of avascular necrosis of the femoral head.

Dislocation of primary total hip arthroplasty:Analysis of risk factors and preventive options

Total hip arthroplasty(THA)is one of the most successful elective operations in orthopedic surgery for improving pain and functional disability in patients with end-stage joint disease.However,dislocation continues to be a troublesome complication after THA,as it is a leading cause of revision and is associated with substantial social,health,and economic costs.It is a relatively rare,usually early occurrence that depends on both the patients’characteristics and the surgical aspects.The most recent and important finding is the special attention to be given preoperatively to spinopelvic mobility,which is closely related to the incidence of dislocation.Consequently,clinical and radiographic assessment of the lumbar spine is mandatory to identify an altered pelvic tilt that could suggest a different positioning of the cup.Lumbar spinal fusion is currently considered a risk factor for dislocation and revision regardless of whether it is performed prior to or after THA.Surgical options for its treatment and prevention include the use of prostheses with large diameter of femoral head size,dual mobility constructs,constrained liners,and modular neck stems.

S-ROM modular arthroplasty combined with transverse subtrochanteric shortening for Crowe type IV congenital dislocation of hip

This work was carried out to evaluate the clinical efficacy and the complications of S-ROM modular hip arthroplasty combined with transverse subtrochanteric shortening for Crowe type IV congenital dislocation of the hip （CDH）. Methods A totoal of 28 consecutive patients with Crowe type IV CDH received treatment using this surgical technique from June 2003 to June 2010. The follow-up was conducted at 3 days, 1, 6, and 12 months after the operation and later annually at the outpatient of our hospital. Sequential pelvic plain film and normotopia film of the affected hip joint were taken. The limp and the Trendelenburg sign were also assessed, the ischiadic nerve injury was also evaluated by electromyogram, and Harris hip scores were recorded. Results After operation, both the alignment and the position of the transverse osteotomies were good. None of the patients had presented complications of joint infection, prosthesis loosening, joint dislocation, or nerve injury. Conclusions S-ROM modular hip arthroplasty combined with transverse subtrochanteric shortening was a satisfactory and safe technique for the Crowe type IV congenital hip dislocation within a mean follow up of 53 months. Transverse subtrochanteric shortening could effectively prevent the distraction injury of sciatic nerve.

Bipolar hip arthroplasty using conjoined tendon preserving posterior lateral approach in treatment of displaced femoral neck fractures

BACKGROUND Hip fractures account for 23.8%of all fractures in patients over the age of 75 years.More than half of these patients are older than 80 years.Bipolar hemiarthroplasty(BHA)was established as an effective management option for these patients.Various approaches can be used for the BHA procedure.However,there is a high risk of postoperative dislocation.The conjoined tendon-preserving posterior(CPP)lateral approach was introduced to reduce postoperative dislocation rates.AIM To evaluate the effectiveness and safety of the CPP lateral approach for BHA in elderly patients.METHODS We retrospectively analyzed medical data from 80 patients with displaced femoral neck fractures who underwent BHA.The patients were followed up for at least 1 year.Among the 80 patients,57(71.3%)were female.The time to operation averaged 2.3 d(range:1-5 d).The mean age was 80.5 years(range:67-90 years),and the mean body mass index was 24.9 kg/m^(2)(range:17-36 kg/m^(2)).According to the Garden classification,42.5%of patients were typeⅢand 57.5%of patients were typeⅣ.Uncemented bipolar hip prostheses were used for all patients.Torn conjoined tendons,dislocations,and adverse complications during and after surgery were recorded.RESULTS The mean postoperative follow-up time was 15.3 months(range:12-18 months).The average surgery time was 52 min(range:40-70 min)with an average blood loss of 120 mL(range:80-320 mL).The transfusion rate was 10%(8 of 80 patients).The gemellus inferior was torn in 4 patients(5%),while it was difficult to identify in 2 patients(2.5%)during surgery.The posterior capsule was punctured by the fractured femoral neck in 3 patients,but the conjoined tendon and the piriformis tendon remained intact.No patients had stem varus greater than 3 degrees or femoral fracture.There were no patients with stem subsidence more than 5 mm at the last follow-up.No postoperative dislocations were observed throughout the follow-up period.No significance was found between preoperative and postoperative mean Health Service System scores(87.30±2.98 vs 86.10±6.10,t=1.89,P=0.063).CONCLUSION The CPP lateral approach can effectively reduce the incidence of postoperative dislocation without increasing perioperative complications.For surgeons familiar with the posterior lateral approach,there is no need for additional surgical instruments,and it does not increase surgical difficulty.