A Case of Cementless Impaction Bone Graft in a Revision Total Hip Arthroplasty Requiring Calcar Reconstruction.

Introduction: In cases of bone deficiency or osteoporosis, and especially in revision cases, there were only two options for treatment until the impaction bone graft procedure was proposed. These were cemented or cementless femoral prosthesis. In the early 1990s, the use of impaction bone graft with a cemented mantle had gained popularity and had proven to be clinically effective.

Risk factors for throwing elbow injuries during pitching analyzed by simulation using human musculoskeletal model in youth baseball pitchers.

Background: Pitching mechanics are believed to be risk factors for throwing elbow injury. Thus, a prospective study of abnormal mechanics in youth baseball players is needed. This study aimed to analyze the ulnar collateral ligament during normal pitching using SIMM (Software for Interactive Musculoskeletal Modeling) for analysis and investigate the risk parameters of throwing elbow injuries in youth baseball players.

Patient-Reported Outcomes and Perioperative Complications of Total Hip Arthroplasty Following Joint Preservation Surgery for Hip Dysplasia.

Background: There is growing recognition of the importance of patient-reported outcome measures and assessment of patient satisfaction in the evaluation of outcomes following surgical interventions. This study aimed to evaluate patient-reported outcomes and complication rates after total hip arthroplasty following joint preservation surgery for hip dysplasia.

Methods: Patient-reported outcomes and complication rates of 85 hips with previous joint preservation surgery (salvage group) were compared with those of 1279 hips without joint preservation surgery (primary arthroplasty group).

Radiographic factors to predict operation time of direct anterior total hip arthroplasty for dysplastic hips.

Background: This study aimed to identify radiographic factors that could predict surgical difficulty in direct anterior total hip arthroplasty (THA) for dysplastic hips.

Patients And Methods: The clinical records of 160 patients (204 hips) who underwent primary THA for the treatment of developmental dysplasia of the hip were retrospectively investigated. All THAs were performed through a direct anterior approach by a single surgeon.

Improvement of the Gap Adjustment in Total Knee Arthroplasty Using the Posterior Condylar Pre-cut Technique.

To provide adequate gaps for knee extension and flexion during total knee arthroplasty, a femoral component placement decreases the extension gap because the posterior capsule tension increases against the protrusion of the posterior part of the femoral component. We thought that the influence of this component on the extension gap depends on the amount of posterior femoral bone resection and the thickness of the posterior femoral components. We hypothesized that less bone resection and a thinner posterior part of the femoral component might avoid these problems.

Acetabular revision using a Kerboull-type reinforcement device through direct anterior approach.

Background: The direct anterior approach has gained popularity in total hip arthroplasty (THA) over the past decade. However, there are few reports that describe the use of this approach for cases of complex revision. The purpose of this study was to report the surgical procedure and early clinical results of acetabular revision in the presence of bone defects using a Kerboull-type reinforcement device through the direct anterior approach.

Natural Remission of Major Periprosthetic Osteolysis following Total Hip Arthroplasty with Metal-on-Metal Bearings.

The natural course of adverse events following the use of metal-on-metal (MoM) bearings in total hip arthroplasty (THA) is not well known. In this article, we report the case of a patient with asymptomatic major acetabular osteolysis following MoM THA that diminished gradually without any surgical intervention. A 58-year-old male underwent one-stage bilateral MoM THA for bilateral osteoarthritis.

Cementless Tapered-Wedge Stem Length Affects the Risk of Periprosthetic Femoral Fractures in Direct Anterior Total Hip Arthroplasty.

Background: Although the popularity of the direct anterior approach for total hip arthroplasty has increased, the femoral procedure in this approach is considered technically challenging, and one of the most frequent complications reported was periprosthetic femoral fractures. The present study aimed to identify factors for predicting the risk of periprosthetic femoral fractures after using stems with a cementless tapered-wedge design through the direct anterior approach.

Methods: We retrospectively assessed the medical records of 686 patients (851 hips) who underwent primary total hip arthroplasty using a single stem with a cementless tapered-wedge design having a short or standard length option.

Prospective analyses of female urinary incontinence symptoms following total hip arthroplasty.

Introduction And Hypothesis: Some patients with hip osteoarthritis report that urinary incontinence (UI) is improved following total hip arthroplasty (THA). However, the type and severity of UI remain unclear. In this study, we hypothesize that both stress urinary incontinence (SUI) and urge urinary incontinence (UUI) are improved after THA.

Epidemiology of Dislocation Following Direct Anterior Total Hip Arthroplasty: A Minimum 5-Year Follow-Up Study.

Background: The cumulative mid- to long-term risk of dislocation following total hip arthroplasty is considerably greater than has been reported in short-term studies. We retrospectively investigated the epidemiology of first-time dislocation following total hip arthroplasty using 28-mm heads through the direct anterior approach in patients with hip dysplasia who were followed up for more than 5 years.

Methods: The operative records of 871 hips in 790 consecutive patients were reviewed to determine the incidence of postoperative first-time dislocation.

Perioperative complication rate of one-stage bilateral total hip arthroplasty using the direct anterior approach.

Background: To date, details of the surgical and clinical outcomes of one-stage bilateral total hip arthroplasty using the direct anterior approach have not been widely available. The purpose of this study was to report the perioperative blood management and investigate the perioperative complication rate of one-stage bilateral total hip arthroplasty using the direct anterior approach.

Methods: We retrospectively assessed 325 consecutive patients (650 hips) who underwent one-stage bilateral total hip arthroplasty through the direct anterior approach.

Comparison of patient satisfaction after unilateral or simultaneous bilateral total hip arthroplasty through a direct anterior approach: Evaluation using the Japanese Orthopaedic Association Hip Disease Evaluation Questionnaire.

Background: The aim of this study was to compare patients' perception of treatment outcome after unilateral or simultaneous total hip arthroplasty (THA) using the newly developed Japanese Orthopaedic Association Hip Disease Evaluation Questionnaire (JHEQ).

Methods: This study included 429 patients treated with primary THA using a direct anterior approach, namely 304 cases of in the unilateral THA (58 males and 246 females; mean age, 62.3 years) and 125 cases of in the simultaneous bilateral THA (24 males and 101 females; mean age, 58.

Total hip arthroplasty through a direct anterior approach for fused hips.

Introduction: Conversion to total hip arthroplasty (THA) from a fused hip is a challenging procedure because of the technical difficulties involved. Here we report the surgical procedure and the early clinical outcome of conversion THA from a fused hip through a direct anterior approach.

Methods: 9 consecutive THAs following hip fusion were performed in 9 patients.

Total Hip Arthroplasty after Previous Acetabular Osteotomy: Comparison of Three Types of Acetabular Osteotomy.

To compare surgical results of total hip arthroplasty (THA) following acetabular osteotomy, operative records of 13 hips following Chiari osteotomy (Chiari group), 22 hips following rotational periacetabular osteotomy (RAO; RAO group), 16 hips following shelf acetabuloplasty (Shelf group), and 2475 hips without previous osteotomy (Control group) were retrospectively reviewed. The operative time was significantly longer in the RAO group than in the Control group. Bulk bone augmentation was required more often in the Chiari and RAO groups than in the Control group.

An anatomic study of the impressions on the greater trochanter: bony geometry indicates the alignment of the short external rotator muscles.

In this study, 44 hip regions from 25 embalmed cadavers were dissected to identify the bony landmarks on the greater trochanter, which indicate the individual short external rotator muscle insertions. Micro-computed tomography (micro-CT) images were obtained to identify the bony impressions on the greater trochanter. Then, the soft tissues were removed and their insertions were identified to assess correlation with micro-CT images.

Hip dysfunction-related urinary incontinence: a prospective analysis of 189 female patients undergoing total hip arthroplasty.

Patients reporting that their symptoms of urinary incontinence have decreased after total hip arthroplasty can be encountered in orthopedic practice. In this questionnaire-based study, we prospectively evaluated the symptoms of urinary incontinence before and after total hip arthroplasty. The International Consultation on Incontinence Questionnaire-Short Form was used to prospectively evaluate these symptoms in 189 consecutive female patients undergoing total hip arthroplasty.

Total hip arthroplasty with subtrochanteric shortening osteotomy for Crowe grade 4 dysplasia using the direct anterior approach.

Between September 2006 and June 2011, 1521 primary total hip arthroplasties were performed using the direct anterior approach on a standard surgical table. In 12 hips, subtrochanteric shortening osteotomy was required. Full weight bearing was allowed 1 week after surgery.

Completion of the full-length genome sequence of human parainfluenza virus types 4A and 4B: sequence analysis of the large protein genes and gene start, intergenic and end sequences.

We have already reported the nucleotide sequences of the NP, P/V, M, F and HN genes of human parainfluenza virus type 4A (hPIV-4A) and type 4B (hPIV-4B). Here, we have determined the sequences of the L protein genes as well as the gene start, intergenic and end sequences, thereby completing the full-length genome sequence of hPIV-4A and 4B. hPIV-4A and 4B have 17,052 and 17,304 nucleotides, respectively.