A Possible New Radiographic Predictor of Progression of Osteoarthritis in Developmental Dysplasia of the Hip: The Center Gap.

Background: Patients with comparable severities of developmental dysplasia of the hip (DDH) may variably progress to osteoarthritis (OA) over time. Although joint congruency may be associated with OA progression in patients with DDH, it has only been assessed subjectively. We assessed the gap between the rotational centers of the acetabulum and femoral head (center gap) as a possible predictive measure of OA progression in patients with DDH.

The influence of early radiolucent lines appearing on femoral head penetration into HXLPE cemented sockets.

Introduction: This study investigates differences in femoral head penetration between highly cross-linked polyethylene (HXLPE) cemented sockets both with and without radiolucent lines (RLLs) in the early postoperative phase and at 5 years follow-up.

Methods: There were 35 patients (37 hips), mean age of 66.8 years, who underwent total hip arthroplasty (THA) using highly HXLPE cemented sockets.

Patient-reported outcomes in patients who undergo total hip arthroplasty after periacetabular osteotomy.

Background: There has been constant discussion about whether the clinical outcome of THA after periacetabular osteotomy (PAO) is equivalent to that after primary total hip arthroplasty (THA). However, there have been few reports about patient-reported outcomes (PRO) for those who undergo THA after PAO. We compared the pre- and postoperative PRO of patients who underwent THA after PAO and those who underwent primary THA alone.

Laterality of radiographic osteoarthritis of the knee.

There are few reports of the laterality in radiological knee osteoarthritis (ROA). This study aimed to evaluate laterality in terms of the minimum joint space width (mJSW) and osteophyte areas (OFs) in a cross-sectorial general population screen and elucidate the association between laterality and risk of osteoarthritis. We enrolled 330 participants (mean age 64.

Significantly Poor Outcomes of Total Hip Arthroplasty After Failed Periacetabular Osteotomy.

Background: Periacetabular osteotomy (PAO) is an effective treatment for preosteoarthritis and early osteoarthritis in young and active patients with hip dysplasia. However, conversion to total hip arthroplasty (THA) for failed PAO is difficult owing to morphologic changes. The objective of the present study was to investigate outcomes of patients who underwent THA for failed PAO.

Preoperative prognosis score is a useful tool regarding eccentric rotational acetabular osteotomy in patients with acetabular dysplasia.

Background: It is unknown how possible preoperative factors influence the postoperative outcome of eccentric rotational acetabular osteotomy (ERAO). We aimed to determine these factors and to develop a scoring system for predicting the prognosis after ERAO in patients with symptomatic hip dysplasia.

Patients: We included 700 patients (54 men, 646 women) who underwent ERAO during September 1989 to March 2013.

Surgical education of eccentric rotational acetabular osteotomy for hip trainees.

Background: Periacetabular osteotomy is an excellent intervention for patients at early-stage osteoarthritis, but surgical education for this technique is more difficult than that for total hip arthroplasty.

Subjects And Methods: 47 joints were included from patients who underwent eccentric rotational acetabular osteotomy (ERAO) performed by 6 trainees under the instructing physician's guidance. We evaluated operative time, blood loss, radiographic parameters, clinical scores, perioperative complications, and 10-year survival rates.

Validity of radiographic assessment of the knee joint space using automatic image analysis.

Objectives: The present study investigated whether there were differences between automatic and manual measurements of the minimum joint space width (mJSW) on knee radiographs.

Methods: Knee radiographs of 324 participants in a systematic health screening were analyzed using the following three methods: manual measurement of film-based radiographs (Manual), manual measurement of digitized radiographs (Digital), and automatic measurement of digitized radiographs (Auto). The mean mJSWs on the medial and lateral sides of the knees were determined using each method, and measurement reliability was evaluated using intra-class correlation coefficients.

Surgical skills training for primary total hip arthroplasty.

A total of 483 hips treated by primary total hip arthroplasty (THA) were investigated to evaluate the surgical skill of the performing surgeon. Surgical trainees operated on 259 hips and instructors on 224 hips. The average age of the patients at the time of THA in the trainee and instructor group was 61.

Gender difference does not affect the outcomes of eccentric rotational acetabular osteotomy used in hip dysplasia.

Introduction: Various types of periacetabular osteotomies have been proposed to treat acetabular dysplasia for young and active patients. Acetabular dysplasia is prevalent in women and rare in men, therefore few reports exist concerning periacetabular osteotomy of male patients. The purpose of this study is to clarify the gender differences in surgical techniques, radiographic and clinical outcomes.

Epidemiology of nontraumatic osteonecrosis of the femoral head in Japan.

Objectives: To elucidate the epidemiology of nontraumatic osteonecrosis of the femoral head (ONFH), and to estimate the annual incidence rate in Japan.

Methods: We examined, over the course of 3 years, personal records and radiographic images from the national registry of documents used for the study of nontraumatic ONFH in patients in Aichi Prefecture, Japan (population: 7.4 million).