Association between estrogen receptor gene polymorphism and back pain intensity in female patients with degenerative lumbar spondylolisthesis.

Study Design: Prospective study.

Objective: To examine the possible association of estrogen receptor α (ERα) polymorphisms and pain intensity in symptomatic female degenerative spondylolisthesis (DS) patients.

Summary Of Background Data: DS has been associated with a significant sex effect.

Posterior approach with posterior soft tissue repair in revision total hip arthroplasty.

We investigated the influence of the posterior approach with soft tissue repair in revision hip arthroplasty by evaluating the rate of early posterior dislocation. Ninety-one patients (96 hips) who had undergone revision hip arthroplasty through the posterior approach were observed for 1 year or until dislocation occurred. Fifty-six revision hip arthroplasties were performed using the posterior approach with soft tissue repair technique.

True femoral anteversion during primary total hip arthroplasty: use of postoperative computed tomography-based sections.

This study investigated a reference line that is closer to the true femoral anteversion on only the cutting surface of the proximal femoral neck during a femoral stem insertion in a cementless total hip arthroplasty. A postoperative computed tomography of both hips from 33 consecutive patients after a unilateral primary cementless total hip arthroplasty with an avascular necrosis of the femoral head was taken to observe the positioning of the stem and its correlation with the true anteversion of the contralateral side. The average of the midcortical angle was 14.

Alterations in the differentiation ability of mesenchymal stem cells in patients with nontraumatic osteonecrosis of the femoral head: comparative analysis according to the risk factor.

It has been suggested that decreased replication capacity of mesenchymal stem cells (MSCs) or decreased MSCs activity in the bone marrow is related to nontraumatic osteonecrosis (ON). However, little is known about differentiation ability of MSCs according to the risk factor of nontraumatic ON. We hypothesize that differentiation abnormalities in MSCs of the bone marrow of the proximal femurs might be related to nontraumatic ON of the femoral head.

Decreased osteogenic differentiation of mesenchymal stem cells in alcohol-induced osteonecrosis.

We postulated that osteogenic and adipogenic differentiation ability of the mesenchymal stem cells isolated from the bone marrow could be altered in patients with alcohol-induced osteonecrosis of the femoral head. To examine this hypothesis, we investigated the differentiation ability of the mesenchymal stem cells isolated from the bone marrow from the proximal end of the femur during hip replacements in patients with alcohol-induced osteonecrosis of the femoral head and compared it with the differentiation ability of patients with femoral neck fractures. Marrow was collected from the proximal femurs of 33 patients having hip replacement for either alcohol-induced osteonecrosis of the femoral head or femoral neck fractures.