Spinopelvic challenges in primary total hip arthroplasty.

There is no universal safe zone for cup orientation. Patients with spinal arthrodesis or a degenerative lumbar spine are at increased risk of dislocation. The relative contributions of the hip (femur and acetabulum) and of the spine (lumbar spine) in body motion must be considered together.

Functional Anatomy of the Hip Joint.

Background: The functional anatomy of the osteoarthritic hip joint in the sagittal plane has not been defined. The purpose of this study was to define the functional anatomy of the hip using clinical and radiographic analyses.

Methods: 320 hips had preoperative standing and sitting lateral spine-pelvis-hip X-rays.

The Effects of Pelvic Incidence in the Functional Anatomy of the Hip Joint.

Background: The spine-pelvis-hip interaction during postural change should be considered in the functional anatomy of the hip. The component parts of this anatomy and how they influence hip function are important to know. Pelvic incidence (PI) is one of these components.

Functional Safe Zone Is Superior to the Lewinnek Safe Zone for Total Hip Arthroplasty: Why the Lewinnek Safe Zone Is Not Always Predictive of Stability.

Background: The Lewinnek "safe zone" is not always predictive of stability after total hip arthroplasty (THA). Recent studies have focused on functional hip motion as observed on lateral spine-pelvis-hip x-rays. The purpose of this study was to assess the correlation between the Lewinnek safe zone and the functional safe zone based on hip and pelvic motion in the sagittal plane.

A prospective evaluation of pulmonary function in patients with adolescent idiopathic scoliosis relative to the surgical approach used for spinal arthrodesis.

Study Design: A prospective evaluation of pulmonary function in patients with adolescent idiopathic scoliosis undergoing surgical correction.

Objectives: 1) To evaluate prospectively, at regular intervals, the changes in pulmonary function after surgical arthrodesis of primary thoracic and double primary thoracic-lumbar (double major) types of adolescent idiopathic scoliosis in a homogeneous population; 2) to compare the changes in pulmonary function after surgical correction relative to the surgical approach used for spinal arthrodesis; and 3) to determine if short- to midterm morbidity with respect to pulmonary function is associated with the type of surgical approach used for spinal arthrodesis.

Summary Of Background Data: The effect of surgical correction on the pulmonary function of patients with adolescent idiopathic scoliosis is controversial.

Comparison of push-prone and lateral-bending radiographs for predicting postoperative coronal alignment in thoracolumbar and lumbar scoliotic curves.

Study Design: A comparative evaluation of supine right and left lateral-bending radiographs and push-prone radiographs in patients with thoracolumbar and lumbar scoliosis to determine postoperative correction of the curve.

Objectives: To determine the difference in the ability of the push-prone radiograph and the supine lateral-bending radiograph to predict postoperative coronal alignment for primary thoracolumbar and lumbar curves managed with an anterior spinal instrumentation and fusion.

Summary Of Background Data: Right and left supine side-bending radiographs are the standard means of evaluating curve flexibility before surgery in idiopathic scoliosis.