Knee dynamics during take-off and landing in spike jumps performed by volleyball players with patellar tendinopathy.

[Purpose] Patellar tendinopathy is a common sports injury. The risk factors for this injury can be categorized as intrinsic, extrinsic, and dynamic. We examined the dynamic factors in this study.

Dynamic femoral head translations in dysplastic hips.

Background: Developmental dysplasia of the hip is an important disease leading to osteoarthritis. Recently, researchers have focused on hip instability as a potentially important dynamic factor for osteoarthritis, but the detailed kinematics of dysplastic hips during weight-bearing gait have not been reported. The purpose of this research is to contrast femoral translation in contralateral healthy hips and dysplastic hips during weight-bearing stepping.

Three-dimensional shape optimization of a cemented hip stem and experimental validations.

This study proposes novel optimized stem geometry with low stress values in the cement using a finite element (FE) analysis combined with an optimization procedure and experimental measurements of cement stress in vitro. We first optimized an existing stem geometry using a three-dimensional FE analysis combined with a shape optimization technique. One of the most important factors in the cemented stem design is to reduce stress in the cement.

Early weight-bearing after periacetabular osteotomy leads to a high incidence of postoperative pelvic fractures.

Background: It has not been shown whether accelerated rehabilitation following periacetabular osteotomy (PAO) is effective for early recovery. The purpose of this retrospective study was to compare complication rates in patients with standard and accelerated rehabilitation protocols who underwent PAO.

Methods: Between January 2002 and August 2011, patients with a lateral center-edge (CE) angle of < 20°, showing good joint congruency with the hip in abduction, pre- or early stage of osteoarthritis, and age younger than 60 years were included in this study.

Intermediate- to long-term results after hybrid total hip arthroplasty in patients with rheumatoid arthritis.

There have been few reports describing intermediate- to long-term results after hybrid total hip arthroplasty in patients with rheumatoid arthritis. We followed up 52 hips in 44 patients aged 5 men and 39 women, with a mean of 11.5 years (range, 5-23.

Blockade of JNK and NFAT pathways attenuates orthopedic particle-stimulated osteoclastogenesis of human osteoclast precursors and murine calvarial osteolysis.

Particles released from orthopedic implants attract immune host defense cells to the bone-implant interface and contribute to development of inflammation. The inflammatory microenvironment supports recruitment and differentiation of osteoclasts, the primary culprit of osteolysis. Therefore, understanding the complex signals that contribute to osteoclastogenesis and osteolysis is a sensible approach to design strategies to inhibit bone loss.

Epidemiology of degenerative lumbar scoliosis: a community-based cohort study.

Study Design: A 12-year prospective study of pre-existing and de novo degenerative lumbar scoliosis (DLS) among community-based female volunteers.

Objective: To investigate serial entire spine radiographs of healthy female volunteers and to clarify radiographical characteristics and predictors of pre-existing and de novo DLS.

Summary Of Background Data: DLS is among the most frequent spinal defomities in the aging spine; however, the onset or the natural course of this condition has not been elucidated.

Radiological classification of glenoid deformity in rheumatoid arthritis.

We report a classification system based on the changes in shape of the glenoid fossa and on an evaluation of the upward migration of the humeral head, because a simple classification based on X-ray evaluation would be of great assistance to physicians dealing with the diagnosis and treatment of RA. We evaluated 150 shoulders of 118 RA patients who showed changes in the glenoid fossa after radiological examinations. The morphology of the glenoid fossa of the RA shoulder was classified into 3 types and we were able to classify a total of six types of deformities by adding the problem of upward migration of the humeral head.

Intermediate to long-term results of periacetabular osteotomy in patients younger and older than forty years of age.

Background: The treatment of middle-aged patients with periacetabular osteotomy remains controversial. The goal of the present retrospective study was to analyze the intermediate to long-term functional and radiographic results of periacetabular osteotomy in patients below and above the age of forty years.

Methods: Between February 1990 and December 2004, 166 periacetabular osteotomies were performed in 146 patients.

Supplemental treatment of rheumatoid arthritis with natural milk antibodies against enteromicrobes and their toxins: results of an open-labelled pilot study.

Background: Environmental factors, particularly commensal bacteria in the gastrointestinal tract, may be involved in the pathogenesis of rheumatoid arthritis (RA). The aim of this study was to evaluate whether natural milk antibodies against a wide spectrum of pathogenic enteromicobes and their toxins modify the disease activity in RA.

Methods: Twenty patients with RA, whose disease activity was uncontrolled by authentic medications due to drug resistance, complications and/or risk factors were treated for 3 months with an oral administration of a whey protein concentrate (WPC) containing high levels of natural milk antibodies.

Hybrid total hip arthroplasty using specifically-designed stems for patients with developmental dysplasia of the hip. A minimum five-year follow-up study.

A 4-U hybrid total hip arthroplasty (THA) system was specifically designed for patients with developmental dysplasia of the hip (DDH). Straight stem with an appropriate offset and various size variations are advantages. We followed 128 hips in 124 patients, 13 men and 111 women, for a mean of 6.

Use of a deep polyethylene liner for the treatment of recurrent dislocation.

Modular component exchange is one of several viable options for treating instability after total hip arthroplasty (THA). Recently, we reported that polyethylene liners retrieved from stable THAs had significantly deeper cup articular geometry than liners retrieved from dislocated THAs. Modular liner exchange with implantation of a deeper cup articulation for the treatment of THA instability may be an option in certain cases.

Cemented calcar replacement femoral component in revision hybrid total hip arthroplasty.

We evaluated intermediate-term to long-term survival of cemented calcar replacement femoral components in hybrid revision total hip arthroplasty. We followed up 52 hips in 50 patients for a mean of 11.4 years.

Radiographic analysis of newly developed degenerative spondylolisthesis in a mean twelve-year prospective study.

Study Design: Prospective study of community-based female volunteers.

Objective: To investigate the incidence of newly developed degenerative spondylolisthesis (DS) among those without baseline deformity, and to clarify radiographic characteristics and predictors of DS.

Summary Of Background Data: There has been limited number of prospective studies of DS.

Spinal metastasis from lung cancer fifteen years after surgery presenting a pseudohemangioma appearance of the vertebra: a case report.

Study Design: Case report.

Objective: To describe a case of solitary metastasis of the seventh thoracic vertebra (T7) from lung cancer 15 years after surgery.

Summary Of Background Data: Late recurrence of the bone over 5 years after curative surgery for lung cancer is highly exceptional.

Porous-coated cementless acetabular components without bulk bone graft in revision surgery.

We previously reported the average 9.3-year (range, 5-13 years) results of 74 patients (83 hips) with porous-coated acetabular components that were placed without bulk bone graft at revision surgery. Since the previous report, 7 patients (7 hips) died before the minimum follow-up of 10 years, and 1 patient (1 hip) was lost to follow-up.

Changes in the sagittal spinal alignment of the elderly without vertebral fractures: a minimum 10-year longitudinal study.

Background: Thoracic hyperkyphosis, or loss of lumbar lordosis, is often equated with osteoporosis because vertebral fractures are assumed to be a major causative factor. However, recent evidence suggests that up to one-half of the patients with hyperkyphosis have no evidence of underlying vertebral fracture. The shape characteristics of the intervertebral discs and their role in determining kyphotic curvature have been investigated.

Serological monitoring of progression of alveolar echinococcosis with multiorgan involvement by use of recombinant Em18.

Two cases of alveolar echinococcosis (AE) with multiple-organ involvement (the liver, lungs, and bone) were monitored by imaging and serology for 20 years. Resection of the bone lesion was complete in one case but incomplete in the other case. Albendazole treatment was markedly to moderately effective against hepatic and pulmonary AE lesions in both cases, whereas it had almost no effect against the bone lesion in one case.

Long-term efficacy of leflunomide on disease activity and inhibition of joint damage: retrospective comparison with methotrexate for Japanese rheumatoid arthritis patients.

We retrospectively compared treatment impact with leflunomide (LEF) or methotrexate (MTX) on retarding joint damage and clinical symptom including a 28-joint-count Disease Activity Score/erythrocyte sedimentation rate (DAS28-ESR) between two similar groups in patients with rheumatoid arthritis (RA) over an approximately 3-year treatment. One group included 29 patients treated with LEF alone (average dose 16.1 mg/day); the other group included 26 patients treated with MTX (average dose 7.

Three-dimensional computed tomography analysis of non-osteoarthritic adult acetabular dysplasia.

Objective: Little data exists on the original morphology of acetabular dysplasia obtained from patients without radiographic advanced osteoarthritic changes. The aim of this study was to investigate the distribution and degree of acetabular dysplasia in a large number of patients showing no advanced degenerative changes using three-dimensional computed tomography (3DCT).

Materials And Methods: Eighty-four dysplastic hips in 55 consecutive patients were studied.

An in vivo model for intraoperative assessment of impingement and dislocation in total hip arthroplasty.

We have developed an intraoperative model to quantify total hip arthroplasty impingement and dislocation mechanics using fluoroscopy and shape-matching techniques. Two patient groups were investigated: group 1 consisted of 12 hips using 28- or 32-mm femoral heads and an anterolateral surgical approach, and group 2 consisted of 17 hips using 22- or 26-mm femoral heads and a posterolateral surgical approach. During intraoperative hip stability testing consisting of extension and external rotation motions, group 1 was more unstable, and prosthetic impingement was the major reason for dislocation.

Effects of dry needling at tender points for neck pain (Japanese: katakori): near-infrared spectroscopy for monitoring muscular oxygenation of the trapezius.

Background: Neck pain (katakori) is a common symptom in adult Japanese people. However, the pathophysiological aspect of this condition has not been well documented to date. The purpose of this study was to investigate the effects of tender point dry needling to the trapezius muscles and the resultant changes in muscular hemodynamics.

Effects of bisphosphonates on fracture incidence and bone metabolism in rheumatoid arthritis patients in general practice taking long-term corticosteroid therapy: a retrospective study.

Background And Objective: There is a risk that disturbances of activities of daily living (ADL) due to rheumatoid arthritis (RA) are increased by the occurrence of fractures, including vertebral compression fractures and femoral neck fractures, in RA patients receiving oral corticosteroid therapy. Bisphosphonates are most commonly used in the treatment of postmenopausal osteoporosis. In a large-scale, randomized, double-blind, placebo-controlled study that was performed to assess the prophylactic efficacy of bisphosphonates, alendronic acid decreased the incidence of vertebral fractures by approximately 50% compared with placebo in postmenopausal patients.