Principles for Management of Periprosthetic Acetabular Fractures after Hip Arthroplasty

Periprosthetic acetabular fracture (PAF) is an uncommon complication following hip arthroplasty. However, as the number of people needing hip prostheses continues to rise, the absolute number of PAF is expected to increase as well. These fractures may occur either intraoperatively or postoperatively. Postoperative fractures can be caused by traumatic events or by pathologic conditions related to periacetabular osteolysis. The management of PAF usually depends on the degree of displacement and the stability of the acetabular component. While most of non-displaced fractures can be managed nonoperatively by protected weight bearing, displaced fractures with unstable implants require surgical intervention, which is often technically challenging. This review summarized the latest findings on the epidemiology, the diagnosis, the classification, and the treatment of PAF.

Modular Stems: Advantages and Current Role in Primary Total Hip Arthroplasty / 대한고관절학회지

Using modular femoral stems in total hip arthroplasty enables surgeons to make fine adjustments to individual joints and offers intraoperative flexibility. The concept of modularity has been developed in numerous shapes, resulting in a vast range of options. Among them, the greatest achievement has been made for prostheses with modular proximal sleeves. The use of these implants has resulted in excellent mid- to long-term results in a number of cases. Although the use of tapered stems with a broaching technique is gaining popularity in straightforward primary surgeries, modular femoral implants are still associated with a number of potential challenges (e.g., developmental dysplasia of the hip, infection sequelae, and skeletal dysplasia). Based on published results, it is advisable to consider it as an option for complicated cases where the proximal femur is severely deformed.

Current Role and Application of Teriparatide in Fracture Healing of Osteoporotic Patients: A Systematic Review

BACKGROUND: The use of osteoanabolic agents to facilitate fracture healing has been of heightened interest to the field of orthopaedic trauma. This study aimed to evaluate the evidence of teriparatide for fracture healing and functional recovery in osteoporotic patients. METHODS: We performed a literature search in PubMed, EMBASE, Web of Science, and the Cochrane Library using terms including “Fracture” [tiab] AND “Teriparatide [tiab] OR “PTH” [tiab]. RESULTS: This systematic review included 6 randomized clinical trials, 4 well-controlled retrospective studies, and 1 retrospective post hoc subgroup analysis. Fracture location was 2 in pelvis, 3 in proximal femur, 1 in distal femur, 1 in shoulder, 2 in wrist and 2 in spine. The use of teriparatide yielded positive effects on radiographic bone healing in 6 studies, but was not associated with better radiographic outcome in 3. In terms of functional recovery, teriparatide injection was related with decrease in pain or shorter time to mobilization in 6 studies, but not related with pain numerical scale and mobility in 3. CONCLUSIONS: Our findings suggest that teriparatide provide selective advantages to fracture healing or functional recovery in the management of osteoporotic fractures. A better understanding of the role of teriparatide on osteoporotic fractures requires greater evidences from large volume prospective trials.

Revision Total Hip Arthroplasty Using Tantalum Augment in Patients with Paprosky III or IV Acetabular Bone Defects: A Minimum 2-year Follow Up Study / 대한고관절학회지

PURPOSE: The purpose of this study is to report the short-term outcomes of revision total hip arthroplasty (THA) using tantalum augments in patients with severe acetabular bone defects. MATERIALS AND METHODS: We retrospectively analyzed 15 revision THAs performed in 15 patients using tantalum augments between June 2010 and December 2013. Acetabular bone defects were Paprosky type IIIA in 7 hips, type IIIB in 7, and type IV in 1. The causes of revision surgery were aseptic loosening in 12 hips and deep infection in 3. Revisions were first in 1 hip, second in 3, and third in 11. Six patients were male and 9 female with a mean age of 59 years (range, 48-75 years). Mean follow-up was 29 months (range, 24-48 months). RESULTS: Mean Harris hip score was improved from 34 points (range, 12-54 points) preoperatively to 84 points (range, 38-90 points) at final follow-up. On the final follow-up radiographs, there were 12 hips (80.0%) with stable fixation of the acetabular cup, 2 (13.3%) with secondary stability after mild acetabular protrusion, and 1 (6.7%) with radiolucency around the acetabular cup without mechanical symptoms. Complications included one patient with acute hematogenous infection managed by surgical debridement and long-term antibiotic therapy. There were no cases with nerve palsy or dislocation during the follow-up period. CONCLUSION: The present study showed satisfactory clinical and radiographic outcomes of revision THA using tantalum augments due to severe acetabular bone defects of Paprosky type III or IV at a minimum follow-up of 2 years.

Plain Radiography of the Hip: A Review of Radiographic Techniques and Image Features / 대한고관절학회지

Plain radiographic examination is a fundamental approach to the diagnosis and treatment decision-making of the hip. A thorough understanding of standard radiographic techniques, radiographic anatomy, and disease patterns affecting the hip can be helpful in improving diagnostic accuracy. This article reviews the standard protocols used to obtain radiographic projections of the hip and addresses specific signs and various radiographic measurements used to adequately and reliably recognize structural diseases of the hip.

A FRAX Experience in Korea: Fracture Risk Probabilities with a Country-specific Versus a Surrogate Model

BACKGROUND: Recently, a Korean fracture-risk assessment tool (FRAX) model has become available, but large prospective cohort studies, which are needed to validate the model, are still lacking, and there has been little effort to evaluate its usefulness. This study evaluated the clinical usefulness of the FRAX model, a FRAX developed by the World Health Organization, in Korea. METHODS: In 405 postmenopausal women and 139 men with a proximal femoral fracture, 10-year predicted fracture probabilities calculated by the Korean FRAX model (a country-specific model) were compared with the probabilities calculated with a FRAX model for Japan, which has a similar ethnic background (surrogate model). RESULTS: The 10-year probabilities of major osteoporotic and hip fractures calculated by the Korean model were significantly lower than those calculated by the Japanese model in women and men. The fracture probabilities calculated by each model increased significantly with age in both sexes. In patients aged 70 or older, however, there was a significant difference between the two models. In addition, the Korean model led to lower probabilities for major osteoporotic fracture and hip fracture in women when BMD was excluded from the model than when it was included. CONCLUSIONS: The 10-year fracture probabilities calculated with FRAX models might differ between country-specific and surrogate models, and caution is needed when applying a surrogate model to a new population. A large prospective study is warranted to validate the country-specific Korean model in the general population.

Current Treatment Strategy for Young Adult Femur Neck Fractures / 대한정형외과학회잡지

Femoral neck fracture in young adults represents a relatively uncommon, high-energy injury associated with higher incidence of complications including nonunion, avascular necrosis of the femoral head, and significant shortening. Preservation of the natural hip anatomy and mechanics is a priority in their management and anatomic reduction and stable internal fixation are critical to achieving the goals of treatment in this young patient population. Current evidence is insufficient to recommend an ideal management method; however, in this article we present the rationale and evidence for timing of surgery, role of capsulotomy, open versus closed reduction, and available internal fixation options.

Meta-analysis of the Incidence and Risk Factors for Squeaking after Primary Ceramic-on-ceramic Total Hip Arthroplasty in Asian Patients / 대한고관절학회지

PURPOSE: The purpose of this study was to assess the squeaking incidence and risk factors after primary ceramic-on-ceramic total hip arthroplasty (THA) in Asian patients using meta-analysis. MATERIALS AND METHODS: We performed a meta-analysis of published data on the squeaking incidence and risk factors from 2000 to 2013. Eight studies in Asians were analyzed for both squeaking incidence and risk factors and 25 studies in Western patients were analyzed for squeaking incidence. The data collected were: patient factors, surgical factors and implantation factors. RESULTS: The overall incidence of hip squeaking was 2.7% in Asians and 3.1% in Westerners. This difference was not statistically significant. The only significant risk factor was an increase in the acetabular cup abduction angle. Of the factors, the cup abduction angle was the only significant risk factor for the occurrence rate of squeaking, and the occurrence rate tended to increase with increasing angle. CONCLUSION: The incidence of squeaking in Asians after primary ceramic-on-ceramic THA is 2.7% and is similar to that in Westerners. The increased cup abduction angle is associated with squeaking; therefore, surgeons should be careful not to implant the cup at a too steep abduction angle.

Prevention of Venous Thromboembolism in Hip Surgery Patients / 대한고관절학회지

The risk for venous thromboembolism (VTE) in total hip arthroplasty and hip fracture surgery is much higher than that of any other surgery. There is a general agreement that prevention of VTE in hip surgery patients is necessary due to concerns regarding symptomatic deep vein thrombosis or fatal pulmonary embolism. Optimal strategies for prevention of VTE include pharmacologic and mechanical approaches; however, the ideal prophylactic regimen has not been identified. Selection of a prophylactic regimen should be balanced between efficacy and safety. This article discusses the different prophylactic options available today for prevention of VTE in hip surgery patients.

Selection and Recommended Usage Guide of Temporary External Fixator

No abstract available.

Minimum Seven-year Follow-up of Cementless Total Hip Arthroplasty with the COREN Hip System / 대한고관절학회지

PURPOSE: We previously reported results of a mean 3.2-year follow-up of the COREN hip system, which is the first total hip prosthesis developed in Korea. The aim of this prospective study was to update the previous report with regard to the hip function and radiographic implant performance. MATERIALS AND METHODS: Between 2003 and 2004, a consecutive series of 68 primary, cementless, total hip prostheses (COREN) were implanted in 57 patients(68 hips) and followed up for a minimum of 7 years. Sixty-three of the 68 hips were available for clinical scoring and radiographic analysis. RESULTS: The mean Harris hip and WOMAC scores were improved from 48.1 and 54.7, preoperatively, to 96.4 and 22.1 at the final follow-up. The mean patient activity increased from 3.1, preoperatively, to 8.2 at the final follow-up. All hips showed stable bony ingrowth on the radiographs. No hips showed evidence of osteolysis or prosthesis loosening, and no revision was required during the follow-up. A Periprosthetic fracture (Vancouver type B1) was encountered in one hip 4.7 years after surgery, which was treated by reoperation. CONCLUSION: This study shows that the COREN hip system produces excellent mid-term results in cementless hip arthroplasty.

Augmentation with Transcortical Wiring of an Onlay-type Prosthesis for a Deficient Patella during Revision Total Knee Arthroplasty

The management of patellae with a severe bony deficiency during revision total knee arthroplasty is a challenging problem. However, using a technique of augmentation with transcortical wiring of an onlay-type prosthesis allowed the authors to revise a deficient patellae successfully. After making the decision to revise the existing patellar component, the procedure was found to be technically straightforward. Furthermore, the procedure does not require sophisticated instruments, only an onlay-type prosthesis, cement and wires. This technique entails fixing wires to the three pegs of the patellar component, passing the wires through drill holes in the anterior cortex and, after compression of a cemented prosthesis, augmenting the fixation by twisting the wires anteriorly. We believe that stable fixation and painless articulation will be obtained with the described technique for deficient patellae.

Treatment of Subtrochanteric Nonunion with a Blade Plate / 대한정형외과학회잡지

PURPOSE: Although nonunion is a relatively common complication in the management of subtrochanteric fractures, there are few studies regarding the treatment of nonunion. The purpose of this study was to evaluate clinical and radiological results for the treatment of subtrochanteric nonunions with a blade plate. MATERIALS AND METHODS: We retrospectively analyzed 16 cases of subtrochanteric nonunions that were treated with a blade plate between April 1997 and June 2008 and were followed for at least one year after the index operation. There were 8 males and 8 females with an average age of 58 years (range, 42-77 years). Outcome variables included the time to union, postoperative complications, Harris hip score, and the functional rating scale of Sanders. The average follow-up period was 26 months (range, 12-63 months). RESULTS: Union was achieved in 15 (94%) of 16 subtrochanteric nonunions after an average of 7 months (range, 4-11 months). One patient who did not reach union after the index operation underwent repeated surgery with a longer blade plate and bone graft, but this patient was eventually treated with total hip arthroplasty because of persistent nonunion and breakage of the blade plate. Two patients developed complications. One patient had bursitis around the greater trochanter and the other developed avascular necrosis of the femoral head. Of these, the patient with avascular necrosis of the femoral head was treated with total hip arthroplasty because of persistent hip pain 2 years after the index operation. At latest follow-up, the mean Harris hip score was 88 points (range, 36-100 points) and the functional rating scale of Sanders was good or excellent in 14 (88%) of 16 patients. CONCLUSION: The treatment of subtrochanteric nonunions with a blade plate is associated with a very high union rate and good clinical results.

VTE Prophylaxis in the Polytrauma Patient

No abstract available.

Determination of an Applicable FRAX Model in Korean Women

We investigated which of the three FRAX fracture risk assessment tool models is most applicable to Korean women. For 306 postmenopausal women (mean age, 77 yr) with a hip fracture, fracture probabilities were calculated using FRAX models from Japan, Turkey and China. Data on bone mineral density (BMD) at the femoral neck were available for 103 patients. Significant differences existed among the models, independent of the inclusion of BMD in the calculation of fracture probabilities. The probabilities of both major osteoporotic fractures and hip fractures were significantly higher in the Japanese model than in the Turkish or Chinese models. In all of the models, the probabilities of a major osteoporotic fracture, but not of a hip fracture, decreased significantly if calculated without BMD values. By applying the Japanese model, the ten-year probabilities for major osteoporotic and hip fractures increased significantly with age. Our results suggest that the Japanese FRAX model might be the most appropriate for Korean women.

Metal-on-Metal Bearing in Total Hip Arthroplasty

Metal-on-metal bearings have been reintroduced with the improved materials, design and manufacturing quality control as an alternative to the conventional metal-on-polyethylene articulation. The advantages of total hip arthroplasty using a metal-on-metal bearing include an extremely low wear rate, a very small risk of in vivo fracture and the use of a larger femoral head. These advantages have led to an increased use of metal-on-metal bearings for younger and more active patients with advanced hip disease. Concerns remain regarding the elevated levels of metal ions and their potential consequences such as metal hypersensitivity or potential carcinogenesis.

Modular Cementless Total Hip Arthroplasty with Subtrochanteric Shortening Osteotomy in Patients with High Hip Dislocation

PURPOSE: The purpose of this study was to report on the results of performing modular cementless total hip arthroplasty with a simultaneous subtrochanteric shortening osteotomy in patients with high hip dislocation. MATERIALS AND METHODS: We evaluated 23 patients (24 hips) with high hip dislocation and who had undergone total hip arthroplasty using a proximally modular cementless stem in combination with a subtrochanteric shortening osteotomy in order to place the acetabular cup at the level of the anatomic hip center between May 1996 and June 2008. There were 6 males and 17 females with a mean age of 44 years. The mean duration of follow-up was 5.6 years. RESULTS: The mean Harris hip score improved from 53 points preoperatively to 88 points at the time of final follow-up (P<0.001), and there were good or excellent results in 21 hips (87.5%). There was one instance of isolated loosening of the acetabular component. With the exception of one hip requiring revision surgery at 12 years postoperatively because of polyethylene wear and cup loosening, all the remaining components were well-fixed at the time of the last follow-up. A total of 4 hips (17%) had complications during follow-up; one dislocation, two transient femoral nerve palsies and one nonunion of the subtrochanteric osteotomy site. CONCLUSION: Modular cementless total hip arthroplasty with a subtrochanteric shortening osteotomy in patients with high hip dislocation was associated with excellent clinical outcomes while it minimized additional fixation of the osteotomy site.

Short-Term Follow-up Results of Periacetabular Osteotomy for Hip Dysplasia

PURPOSE: To evaluate the clinical and radiologic results of periacetabular osteotomy for the treatment of hip dysplasia. MATERIALS AND METHODS: We performed a clinical and radiological assessment of 20 periacetabular osteotomies (19 patients), which had been followed up for > 1 year. The mean age of the patients at the time of surgery was 34.2 years (range, 18~50 years). The average follow-up period was 26.7 months (range, 12~85 months). The Harris hip score and range of motion were used for clinical evaluation. The radiologic measurements were evaluated using the acetabular angle, center-edge angle, acetabular depth, femoral head coverage, and medialization. RESULTS: The mean Harris hip score improved from 59.6 points to 96.4 points. The mean acetabular angle improved from 47.9 degrees to 26.4degrees. The mean center-edge angle increased from 14.2degreesto 41degrees. The acetabular depth increased from 176 to 242.7 The mean femoral head coverage increased from 63.3% to 95.4%. The following complications were noted: hematoma in 2 cases, temporary lateral femoral cutaneous nerve palsy in 3 cases, and superficial wound infection in 1 case. CONCLUSION: Periacetabular osteotomy is an effective surgical treatment for hip dysplasia.

Hip Arthroplasty Using Cementless Modular Femoral Stem for Displaced Femoral Neck Fracture in Patients More than 70 Years Old

Purpose: To evaluate the clinical and radiological results of hip arthroplasty using a cementless modular femoral stem in patients older than 70 years with a femoral neck fracture. Materials and Methods: From January 2002 to May 2005, 67 hip arthroplasty procedures (66 patients) using a cementless modular femoral stem for displaced femoral neck fractures in patients older than 70 years of age were evaluated. All the patients were followed up for more than 2 years. The mean age at surgery was 77 (70~92) years. There were 22 men and 44 women. The mean follow up period was 31 months (24~41). The clinical evaluation was performed by examining the perioperative Activities of Daily Living (ADL) and postoperative complications. The radiological evaluation for femoral stem loosening and osteolysis was performed using the serial postoperative radiographs. The radiological evaluation for leg length discrepancies was performed using the immediate postoperative radiograph. Results: In preoperative ADL, 31 cases (46%) were in grade 1, 21 (31.5%) in grade 2, 14 (21%) in grade 3, 1 (1.5%) in grade 4 and none in grade 5. A review of the postoperative ADL revealed 25 cases (37.5%) in grade 1, 18 (27%) in grade 2, 21 (31%) in grade 3, 3(4.5%) in grade 4 and none in grade 5. Postoperative restoration of the ADL was observed in 48 cases (71.5%). There were no significant complications. Radiographically, all cases showed stable bony fixation of the femoral stem with the exception of 1 case, who showed subsidence and a pedestal reaction. Postoperative leg length discrepancy was observed in 5 cases (7.5%) but was <1 cm in all cases. Conclusion: In elderly patients older than 70 years of age with a displaced femoral neck fracture, cementless hip arthroplasty using a modular femoral stem provides good initial stability and subsequent secure bony fixation with minimal complications.

Perioperative Risk of Hip Arthroplasty in Patients with Cirrhotic Liver Disease

We retrospectively reviewed the complete medical records of 30 patients with a diagnosis of liver cirrhosis who had undergone hip arthroplasty at three academic institutions between October 1994 and May 2001. There were 26 males and 4 females with a mean age of 60 yr at index operation. Surgical procedures included 17 primary total hip arthroplasties (THA), 8 bipolar hemiarthroplasties, and 5 revision THAs. According to the Child-Pugh scoring system, 19 cirrhotic patients were categorized as class A, 9 as class B, and 2 as class C. Eight (26.7%) of the 30 patients had one or more perioperative complications. Of these, wound infection was the most common, with a rate of 10% (3 of 30 hips). Other perioperative complications included surgical site bleeding, coagulopathy, encephalopathy, gastrointestinal bleeding, pneumonia, and arrhythmia. Death occurred in 2 (6.7%) of the 30 patients; both were Child-Pugh's C cirrhotics. A higher Child-Pugh score (p=0.0001) and a high level of creatinine (p=0.0499) were associated with significantly increased perioperative complications or death. Our findings suggest that surgeons should be vigilant about perioperative complications in patients with advanced cirrhotic liver disease who undergo hip arthroplasty, albeit the mortality rates are relatively low in less severe cirrhotics.