Randal R. Betz

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The sagittal spinopelvic balance is poorly documented in normal pediatric subjects. The purpose of this study is to characterize the sagittal spinopelvic balance in the pediatric population and to evaluate the correlations between spinopelvic parameters. Seven parameters were evaluated from the lateral standing radiographs of 341 normal subjects aged 3–18(More)
STUDY DESIGN A multicenter study of the outcomes of the surgical treatment of adolescent idiopathic scoliosis using the Scoliosis Research Society Questionnaire (SRS 24). OBJECTIVE To evaluate the patient based outcome of the surgical treatment of adolescent idiopathic scoliosis. SUMMARY OF BACKGROUND DATA A paucity of information exists with respect to(More)
STUDY DESIGN Prospective study of the sagittal plane alignment of the spine and pelvis in the normal pediatric population. OBJECTIVES To document the sagittal alignment of the spine and pelvis and its change during growth in the normal pediatric population. SUMMARY OF BACKGROUND DATA Pelvic morphology as well as sagittal alignment of the spine and(More)
STUDY DESIGN Clinical and radiologic assessment derived from a prospective multicenter data base of adolescent idiopathic scoliosis (AIS) patients. OBJECTIVE We investigated if "implant density" or the number of screws correlated with the major curve (thoracic or lumbar) correction at 2 years in patients with AIS. We also investigated the effect of(More)
STUDY DESIGN Multicenter, retrospective, nonrandomized comparison group study of patients with severe scoliosis and kyphosis treated after 1995 with halo-gravity traction and without halo-gravity traction before definitive fusion. OBJECTIVE Compare surgical correction of severe spine deformity with preoperative halo traction and without preoperative(More)
BACKGROUND Previous research has suggested a correlation between pulmonary impairment and thoracic spinal deformity. The curve magnitude, number of involved vertebrae, curve location, and decrease in thoracic kyphosis independently contribute to pulmonary impairment, but the strength of these associations has been variable. The objectives of this study were(More)
STUDY DESIGN Retrospective analysis of prospectively collected multicenter series. OBJECTIVE To evaluate the sagittal profile of surgically treated adolescent idiopathic scoliosis (AIS) patients. SUMMARY OF BACKGROUND DATA With the increasing popularity of segmental pedicle screw spinal instrumentation, thoracic kyphosis (TK) is often sacrificed to(More)
STUDY DESIGN Retrospective review. OBJECTIVE To compare the incidence of and risk factors for proximal junctional kyphosis (PJK) in adolescent idiopathic scoliosis (AIS) following posterior spinal fusion using hook, pedicle screw, or hybrid constructs. SUMMARY OF BACKGROUND DATA Proximal junctional kyphosis is a recently recognized phenomenon in adults(More)
This volume is a pleasure to read and to look at. Vaccaro, Betz, and Zeidman enlisted a large number of authoritative contributors to put together a comprehensive and current volume on spine surgery. The basic science chapters, covering embryology, anatomy, and biomechanics are beautifully done; and the anatomic considerations that are important during(More)
STUDY DESIGN A retrospective multicenter consecutive case review of operative adolescent idiopathic scoliosis. OBJECTIVES To define the curve prevalence of a large consecutive series of cases with operative adolescent idiopathic scoliosis as classified by a new system and to test the ability of this new classification system to correlate with regions of(More)