Average 22-Year Results of Total Hip Arthroplasty Using Harris-Galante Prosthesis in Patients under 50 Years

Background@#The Harris-Galante (HG) prosthesis is a first-generation, cementless total hip arthroplasty (THA) prosthesis. Considering the recent increase in the demand for THA in young patients and their life expectancy, a study with a follow-up duration of longer than 20 years in a young population is needed. Therefore, we evaluated the long-term clinical and radiographic results after cementless THA using the HG prosthesis in patients younger than 50 years. @*Methods@#A total of 61 THAs performed using the HG with a minimum follow-up of 10 years were included. There were 38 men and 11 women with an average age of 46 years and the mean follow-up duration was 22 years. Clinical evaluation included modified Harris Hip Score (HHS) and radiographic analysis consisted of cup inclination, anteversion angle, component stability, osteolysis, liner wear rate, wear-through, liner dissociation, and heterotopic ossification. Complications included recurrent dislocation, periprosthetic femoral fracture, and periprosthetic joint infection. Survivorship analysis included cup and stem revision for aseptic loosening, as well as any revision. @*Results@#The HHS improved from 46.5 preoperatively to 81.8 postoperatively (p < 0.001). The average linear wear rate was 0.36 mm/yr. A total of 34 hips (56%) were revised: stem revision in 10 (16.4%), cup revision in 9 (14.8%), exchange limited to bearing surface in 8 (13.1%), and revision of all components in 7 (11.5%). Estimated survivorship at 34 years postoperatively was 90.9% for cup revision for aseptic loosening, 80.5% for stem revision for aseptic loosening, and 22.1% for any revision. @*Conclusions@#THA using the HG prosthesis showed satisfactory estimated survivorship of the acetabular and femoral components at 34 years postoperatively with good clinical outcomes. Bearing-related problems, such as osteolysis and liner dissociation, accounted for 56% of revision operations and were concerns in patients younger than 50 years.

3-Dimensional Printing for Hip Surgery: Current Landscape and Future Perspectives / 대한정형외과학회잡지

Three-dimensional (3D) printing is increasing gradually in orthopedic surgery. Currently, the use of 3D printing in hip surgery is as follows: a bone model for preoperative planning or simulation, patient-specific instruments, surface treatment for stable fixation of implant, and customized implants tailored to the patient’s anatomical characteristics. Orthopedic surgeons can utilize 3D printing technology to improve the surgical techniques, minimize complications during surgery, and provide implants that are more suitable for patients in the correct position. In recent years, new materials for 3D printing are being explored, and the efficiency of cost and production time is improved by developing the production process. In addition, constant drug delivery by improving surface treatment, fusion with other new technologies, such as augmented reality, and tissue or organ regeneration using 3D bioprinting technology is being actively conducted. Above all, orthopedic surgeons should strive to provide the best treatment to patients by learning and researching these new trends, not just adhering to existing treatment methods.

ARCO Consensus on the Pathogenesis of Non-traumatic Osteonecrosis of the Femoral Head

Osteonecrosis of the femoral head (ONFH) is a devastating disease frequently leading to femoral head collapse and hip arthritis. Specifically, non-traumatic ONFH primarily affects young and middle-aged adults. Although compromised local circulation of the femoral head seems to be pathognomonic for the disease, the pathogenesis is perplexing and continues to be an area of scrutiny and research. Comprehension of the pathogenesis is of crucial importance for developing and guiding treatments for the disease. Therefore, we provide an up-to-date consensus on the pathogenesis of non-traumatic ONFH.

Osteonecrosis of the Femoral Head: an Updated Review of ARCO on Pathogenesis, Staging and Treatment

Non-traumatic osteonecrosis of the femoral head (ONFH) usually affects adults younger than 50 years and frequently leads to femoral head collapse and subsequent arthritis of the hip.It is becoming more prevalent along with increasing use of corticosteroids for the adjuvant therapy of leukemia and other myelogenous diseases as well as management of organ transplantation. This review updated knowledge on the pathogenesis, classification criteria, staging system, and treatment of ONFH.

ARCO Consensus on the Pathogenesis of Non-traumatic Osteonecrosis of the Femoral Head

Osteonecrosis of the femoral head (ONFH) is a devastating disease frequently leading to femoral head collapse and hip arthritis. Specifically, non-traumatic ONFH primarily affects young and middle-aged adults. Although compromised local circulation of the femoral head seems to be pathognomonic for the disease, the pathogenesis is perplexing and continues to be an area of scrutiny and research. Comprehension of the pathogenesis is of crucial importance for developing and guiding treatments for the disease. Therefore, we provide an up-to-date consensus on the pathogenesis of non-traumatic ONFH.

Osteonecrosis of the Femoral Head: an Updated Review of ARCO on Pathogenesis, Staging and Treatment

Non-traumatic osteonecrosis of the femoral head (ONFH) usually affects adults younger than 50 years and frequently leads to femoral head collapse and subsequent arthritis of the hip.It is becoming more prevalent along with increasing use of corticosteroids for the adjuvant therapy of leukemia and other myelogenous diseases as well as management of organ transplantation. This review updated knowledge on the pathogenesis, classification criteria, staging system, and treatment of ONFH.

Septic Arthritis of the Hip Joint after Pelvic Radiotherapy in Patients with Cancer: Case Report

Septic arthritis of the hip joint after radiotherapy is a rare complication with distinctive features. It is difficult to recognize this complication because of its late onset and lack of significant fever. We describe three cases of patients with septic arthritis in the hip joint who had a history of radiotherapy in the pelvic region. Our patients developed septic arthritis 1, 2, and 3 years after radiotherapy and these occurrence intervals were relatively shorter when compared to previous literature. Hip joint destruction was noted in all cases. Resection of the femoral head was required to control the infection in two cases. Careful attention is requested to detect septic arthritis when patient experiences pain in joint where underwent radiotherapy. For this case, prompt laboratory study, radiological evaluation, and joint fluid aspiration and culture are required. If there is evidence of infection in these results, a proper and immediate treatment must be started.

CT-based Navigation System Using a Patient-Specific Instrument for Femoral Component Positioning: An Experimental in vitro Study with a Sawbone Model

PURPOSE: The intraoperative version of the femoral component is usually determined by visual appraisal of the stem position relative to the distal femoral condylar axis. However, several studies have suggested that a surgeon's visual assessment of the stem position has a high probability of misinterpretation. We developed a computed tomography (CT)-based navigation system with a patient-specific instrument (PSI) capable of three-dimensional (3D) printing and investigated its accuracy and consistency in comparison to the conventional technique of visual assessment of the stem position. MATERIALS AND METHODS: A CT scan of a femur sawbone model was performed, and pre-experimental planning was completed. We conducted 30 femoral neck osteotomies using the conventional technique and another 30 femoral neck osteotomies using the proposed technique. The femoral medullary canals were identified in both groups using a box chisel. RESULTS: For the absolute deviation between the measured and planned values, the mean two-dimensional anteversions of the proposed and conventional techniques were 1.41° and 4.78°, while their mean 3D anteversions were 1.15° and 3.31°. The mean θ 1, θ 2, θ 3, and d, all of which are parameters for evaluating femoral neck osteotomy, were 2.93°, 1.96°, 5.29°, and 0.48 mm for the proposed technique and 4.26°, 3.17°, 4.43°, and 3.15 mm for the conventional technique, respectively. CONCLUSION: The CT-based navigation system with PSI was more accurate and consistent than the conventional technique for assessment of stem position. Therefore, it can be used to reduce the frequency of incorrect assessments of the stem position among surgeons and to help with accurate determination of stem anteversion.

Deficiency of Lipocalin-2 Promotes Proliferation and Differentiation of Osteoclast Precursors via Regulation of c-Fms Expression and Nuclear Factor-kappa B Activation

BACKGROUND: Lipocalin-2 (LCN2), a small glycoprotein, has a pivotal role in diverse biological processes such as cellular proliferation and differentiation. We previously reported that LCN2 is implicated in osteoclast formation induced by receptor activator of nuclear factor-kappa B ligand (RANKL) and macrophage colony-stimulating factor (M-CSF). In the present study, we used a knockout mouse model to further investigate the role of LCN2 in osteoclast development. METHODS: Osteoclastogenesis was assessed using primary bone marrow-derived macrophages. RANKL and M-CSF signaling was determined by immunoblotting, cell proliferation by bromodeoxyuridine (BrdU) enzyme-linked immunosorbent assay (ELISA), and apoptosis by cell death detection ELISA. Bone morphometric parameters were determined using a micro-computed tomography system. RESULTS: Our results showed that LCN2 deficiency increases tartrate-resistant acid phosphatase (TRAP)-positive multinucleated osteoclast formation in vitro, a finding that reflects enhanced proliferation and differentiation of osteoclast lineage cells. LCN2 deficiency promotes M-CSF-induced proliferation of bone marrow macrophages (BMMs), osteoclast precursors, without altering their survival. The accelerated proliferation of LCN2-deficient precursors is associated with enhanced expression and activation of the M-CSF receptor, c-Fms. Furthermore, LCN2 deficiency stimulates the induction of c-Fos and nuclear factor of activated T cells c1 (NFATc1), key transcription factors for osteoclastogenesis, and promotes RANKL-induced inhibitor of kappa B (IkappaBalpha) phosphorylation. Interestingly, LCN2 deficiency does not affect basal osteoclast formation in vivo, suggesting that LCN2 might play a role in the enhanced osteoclast development that occurs under some pathological conditions. CONCLUSIONS: Our study establishes LCN2 as a negative modulator of osteoclast formation, results that are in accordance with our previous findings.

Pharmacologic treatment of osteoarthritis

A variety of pharmacologic agents have been developed for the treatment of osteoarthritis. At present, however, none of them has been proven to prevent disease progression, and the medications are used only for symptomatic relief. Thus, non-pharmacologic conservative treatment such as education, weight reduction in the obese, and consistent exercise should be recommended first to maintain fitness and tolerance to physical activity. Medication is then indicated to better control symptoms provided non-pharmacologic measures prove inadequate, and a successful strategy most likely would entail a combination of these non-pharmacologic and pharmacologic approaches. Acetaminophen can be tried first because of its efficacy and relatively safe profile, especially in those with mild osteoarthritis. Nonselective non-steroidal anti-inflammatory drugs may be used in patients with moderate to severe pain, but long-term medication requires caution due to the increased risk of gastrointestinal and renal complications. Selective cyclooxygenase-2 inhibitors can be better tolerated, especially in patients with risk factors for gastrointestinal adverse events, but potential cardiac and cerebrovascular thrombotic events should be considered in those with preexisting cardiovascular disease. Tramadol and opioids are more potent analgesics. However, they are not recommended for routine use due to a high incidence of nausea, constipation, and drowsiness. These agents require close monitoring for those adverse effects, especially in a geriatric population. Lastly, the pharmacologic plan should be individualized according to the severity and duration of pain, age and gender of the patient, and concurrent comorbidities to maximize the benefit as well as to minimize the risk of adverse effects from medication.

Early Results of Cementless Total Hip Arthroplasty Using a Third Generation Alumina-on-Alumina Bearing Surface / 대한정형외과학회잡지

PURPOSE: The purpose of this study is to evaluate the early results and occurrence of complications of cementless total hip arthroplasty (THA) using an alumina-on-alumina articulation with a minimum follow up period of three years. MATERIALS AND METHODS: We prospectively followed 108 patients (121 hips) who underwent cementless THA using an alumina-on-alumina articulation. The mean age of the patients was 50.7 years (range, 20-80 years) and mean the follow up period was 48 months (range, 36-60 months). Preoperative diagnoses included osteonecrosis of the femoral head in 90 hips; secondary osteoarthritis due to hip dysplasia in 24 hips; secondary osteoarthritis after acetabular fracture in four hips; acute femoral neck fracture in three hips. Clinical evaluation was performed using Harris hip score (HHS) and radiographic evaluation was performed in terms of the fixation of components and the prevalence of osteolysis. In addition, we observed complications, including the occurrence of sound or fracture of the alumina head or liner. RESULTS: Mean HHS improved from 62.4 points to 94 points at final follow-up. Thigh discomfort was found in six hips and mild inguinal discomfort was found in eight hips. Both had disappeared within one year after operation. A clicking sound was detected in two patients. One hip had become dislocated and an alumina liner fracture had occurred in one hip. Loosening of component or osteolysis was not observed in any hip. The radiographic wear was not measurable. CONCLUSION: Early results of cementless THA using an alumina-on-alumina articulation were favorable, with osseointegration of the components and absence of periprosthetic osteolysis. However, longer-term follow up for a hip clicking sound and fracture of an alumina fracture are necessary.

Association of ADIPOR1 polymorphisms with bone mineral density in postmenopausal Korean women

Adiponectin may affect bone through interactions with two known receptors, adiponectin receptors (ADIPOR) 1 and 2. We examined the association between polymorphisms of ADIPOR1 and ADIPOR2 and bone mineral density (BMD) in postmenopausal Korean women. Six polymorphisms in ADIPOR1 and four polymorphisms in ADIPOR2 were selected and genotyped in all study participants (n = 1,329). BMD at the lumbar spine and femur neck were measured using dual-energy X-ray absorptiometry. Lateral thoracolumbar (T4-L4) radiographs were obtained for vertebral fracture assessment and the occurrence of non-vertebral fractures examined using self-reported data. P values were adjusted for multiple testing using Bonferroni correction (Pcorr). ADIPOR1 rs16850799 and rs34010966 polymorphisms were significantly associated with femur neck BMD (Pcorr = 0.036 in the dominant model; Pcorr = 0.024 and Pcorr = 0.006 in the additive and dominant models, respectively). Subjects with the rare allele of each polymorphism had lower BMD, and association of rs34010966 with BMD showed a gene dosage effect. However, ADIPOR2 single nucleotide polymorphisms and haplotypes were not associated with BMD at any site. Our results suggest that ADIPOR1 polymorphisms present a useful genetic marker for BMD in postmenopausal Korean women.

Inhibitory effect of (-)-epigallocatechin gallate on titanium particle-induced TNF-alpha release and in vivo osteolysis

Tumor necrosis factor-alpha (TNF-alpha) and inflammatory cytokines released from activated macrophages in response to particulate debris greatly impact periprosthetic bone loss and consequent implant failure. In the present study, we found that a major polyphenolic component of green tea, (-)-epigallocatechin gallate (EGCG), inhibited Ti particle-induced TNF-alpha release in macrophages in vitro and calvarial osteolysis in vivo. The Ti stimulation of macrophages released TNF-alpha in a dose- and time-dependent manner, and EGCG substantially suppressed Ti particle-induced TNF-alpha release. Analysis of signaling pathway showed that EGCG inhibited the Ti-induced c-Jun N-terminus kinase (JNK) activation and inhibitory kappaB (IkappaB) degradation, and consequently the Ti-induced transcriptional activation of AP-1 and NF-kappaB. In a mouse calvarial osteolysis model, EGCG inhibited Ti particle-induced osteolysis in vivo by suppressing TNF-alpha expression and osteoclast formation. Therefore, EGCG may be a potential candidate compound for osteolysis prevention and treatment as well as aseptic loosening after total replacement arthroplasty.

Genome-wide Association Study Identification of a New Genetic Locus with Susceptibility to Osteoporotic Fracture in the Korean Population

Osteoporotic fracture (OF), along with bone mineral density (BMD), is an important diagnostic parameter and a clinical predictive risk factor in the assessment of osteoporosis in the elderly population. However, a genomewide association study (GWAS) on OF has not yet been clarified sufficiently. To identify OF-associated genetic variants and candidate genes, we conducted a GWAS in a population-based cohort (Korean Association Resource [KARE], n=1,427 [case: 288 and control: 1139]) and performed a de novo replication study in hospital-based individuals (Asan and Catholic Medical Center [ACMC], n=1,082 [case: 272 and control: 810]). In a combined meta-analysis, a newly identified genetic locus in an intergenic region at 10p11.2 (near genes FZD8 and ANKRD30A ) showed the most significant association (odd ratio [OR] = 2.00, 95% confidence interval [CI] = 1.47~2.74, p=1.27x10(-5)) in the same direction. We provide the first evidence for a common genetic variant influencing OF and genetic information for further investigation in bone metabolism.

Association of Paraoxonase 1 (PON1) polymorphisms with osteoporotic fracture risk in postmenopausal Korean women

There is increasing evidence of a biochemical link between lipid oxidation and bone metabolism. Paraoxonase 1 (PON1) prevents the oxidation of low-density lipoprotein (LDL) and metabolizes biologically active phospholipids in oxidized LDLs. Here, we performed association analyses of genetic variation in PON1 to ascertain its contribution to osteoporotic fractures (OFs) and bone mineral density (BMD). We directly sequenced the PON1 gene in 24 Korean individuals and identified 26 sequence variants. A large population of Korean postmenopausal women (n = 1,329) was then genotyped for eight selected PON1 polymorphisms. BMD at the lumbar spine and femoral neck was measured using dual-energy X-ray absorptiometry. Lateral thoracolumbar (T4-L4) radiographs were obtained for vertebral fracture assessment, and the occurrence of non-vertebral fractures (i.e., wrist, hip, forearm, humerus, rib, and pelvis) was examined using self-reported data. Multivariate analyses showed that none of the polymorphisms was associated with BMD at either site. However, +5989A>G and +26080T>C polymorphisms were significantly associated with non-vertebral and vertebral fractures, respectively, after adjustment for covariates. Specifically, the minor allele of +5989A>G exerted a highly protective effect against non-vertebral fractures (OR = 0.59, P = 0.036), whereas the minor allele of +26080T>C was associated with increased susceptibility to vertebral fractures (OR = 1.73, P = 0.020). When the risk for any OFs (i.e., vertebral or non-vertebral) was considered, the statistical significance of both polymorphisms persisted (P = 0.002-0.010). These results suggest that PON1 polymorphisms could be one of useful genetic markers for OF risk in postmenopausal women.

Treatment of Periprosthetic Femoral Fractures in Hip Arthroplasty

BACKGROUND: We analyzed the radiological and clinical results of our study subjects according to the management algorithm of the Vancouver classification system for the treatment of periprosthetic femoral fractures in hip arthroplasty. METHODS: We retrospectively reviewed 18 hips with postoperative periprosthetic femoral fractures. The average follow-up was 49 months. The fracture type was determined based on the Vancouver classification system. The management algorithm of the Vancouver classification system was generally applied, but it was modified in some cases according to the surgeon's decision. At the final follow-up, we assessed the radiological results using Beals and Tower's criteria. The functional results were also evaluated by calculating the Harris hip scores. RESULTS: Seventeen of 18 cases (94.4%) achieved primary union at an average of 25.5 weeks. The mean Harris hip score was 92. There was 1 case of nonunion, which was a type C fracture after cemented total hip arthroplasty, and this required a strut allograft. Subsidence was noted in 1 case, but the fracture was united despite the subsidence. There was no other complication. CONCLUSIONS: Although we somewhat veered out of the management algorithm of the Vancouver classification system, the customized treatment, with considering the stability of the femoral stem and the configuration of the fracture, showed favorable overall results.

What are the Options for Better Outcomes of Total Hip Arthroplasty?

No abstract available.

Concepts of Genomic Variant Research / 대한정형외과연구학회지

Genetic variation occurs on many different scales, ranging from gross alteration in human chromosomes to single nucleotide changes. Approximately 99.5% of the human genome sequence is identical among humans. The 0.5% of sequence accounts for all individual differences including susceptibility for disease. In 2010 ten complete genome sequences are available. It is estimated that there are over 15 million SNPs exist in the human population. This review introduces outline of linkage study, association, and GWAS, to identify genes and biological processes underlying any trait influenced by inheritance, including human diseases. The technology of next generation sequencing, called NGS, was also introduced. The advent of NGS technologies will drive the next decades of biology and new era of personal genomics.

Genetic association of angiogenesis- and hypoxia-related gene polymorphisms with osteonecrosis of the femoral head

Multiple factors have been implicated in the development of osteonecrosis of the femoral head (ONFH). In particular, non-traumatic ONFH is directly or indirectly related to injury of the vascular supply to the femoral head. Thus, hypoxia in the femoral head caused by impaired blood flow may be an important risk factor for ONFH. In this study, we investigated whether genetic variations of angiogenesis- and hypoxia-related genes contribute to an increased risk for the development of ONFH. Candidate genes were selected based on known hypoxia and angiogenesis pathways. An association study was performed using an Affymetrix Targeted Genotyping 3K Chip array with 460 ONFH patients and 300 control subjects. We showed that single nucleotide polymorphisms (SNPs) in the genes TF, VEGFC, IGFBP3, and ACE were associated with an increased risk of ONFH. On the other hand, SNPs in the KDR and NRP1 genes were associated with protection against ONFH. The most important finding was that one SNP (rs2453839) in the IGFBP3 gene was significantly associated with a higher risk of ONFH (P = 0.0061, OR 7.74). In subgroup analysis, most candidate gene variations that were associated with ONFH occurred in the idiopathic subgroup. Among other SNPs, ACE SNPs were associated with steroid-induced ONFH (P = 0.0018-0.0037, OR > 3). Collectively, our findings suggest that genetic variations in angiogenesis- and hypoxia-related genes may help to identify susceptibility factors for the development of ONFH in the Korean population.

Incidence of Hip Fractures in Jeju Island, South Korea: A Prospective Study (2002-2006)

BACKGROUND: This study was perfomed to estimate the incidence of hip fractures of people older than 50 years in South Korea. METHODS: Information of patients over 50 years of age who had sustained a hip fracture were obtained from the records of eight hospitals in Jeju Island between 2002 and 2006 to calculate the incidence of hip fractures in this age group. RESULTS: There were 820 hip fractures during the study period. The mean age of the patients at the time of fracture was 77.8 years (71.3 years in 181 men, 79.7 years in 639 women). The crude incidence was 128/100,000 (66.1/100,000 in men, 174.4/100,000 in women). The age-specific incidence according to the 10-year age groups increased from 19.3/100,000 for those 50 to 59 years of age to 1,095.4/100,000 for those over 90 years of age (18.9/100,000-960.4/100,000 in men and 19.7/100,000-1112.1/100,000 in women). The standardized incidence of hip fracture to the Caucasian population in the United States in 1990 was 100/100,000 for men and 207/100,000 for women. CONCLUSIONS: Hip fractures will become an important socioeconomic problem in South Korea due to the rapid aging of the population.