Does the direction of pedicle screw rotation affect the biomechanics of direct transverse plane vertebral derotation?

Study Design: In vitro biomechanical investigation using human cadaveric vertebrae.

Objective: Evaluate the biomechanical differences in transverse plane vertebral body derotation maneuvers of thoracic pedicle screws in both medial and lateral directions.

Summary Of Background Data: Thoracic pedicle screws are thought to have better vertebral rotation control and better segmental scoliosis correction compared to hooks and wires.

Spinal growth modulation with an anterolateral flexible tether in an immature bovine model: disc health and motion preservation.

Study Design: An immature bovine model was used to evaluate multilevel anterolateral flexible tethering in a growing spine.

Objective: To evaluate radiographic, biochemical, histologic, and biomechanical results of tethered spinal growth.

Summary Of Background Data: An anterolateral flexible tether has been shown to create a kyphotic and scoliotic spinal deformity in calves.

A biomechanical analysis of a novel arthroscopic suture method compared to standard suture knots and materials for rotator cuff repair.

Purpose: To biomechanically compare a novel suture welding method to 2 standard suture materials when tied with 3 types of arthroscopic knots.

Methods: Sixty suture loops were tied with Weston, Roeder, and Duncan knots for both No. 2 FiberWire (FW) and No.

Short-segment fixation of lumbar burst fractures using pedicle fixation at the level of the fracture.

Study Design: Cadaveric biomechanical study and retrospective chart review.

Objective: Biomechanical comparison of segmental versus nonsegmental fixation of lumbar burst fractures and clinical analysis of short-term radiographic outcomes.

Summary Of Background Data: Traditional short nonsegmental posterior fixation of thoracolumbar burst fractures suffers from high rates of failure.

Biomechanical stability of bioabsorbable screws for fixation of acetabular osteotomies.

The purpose of this study was to compare the biomechanical stability of triple innominate osteotomies fixed with either bioabsorbable or stainless steel screws. Triple innominate osteotomies were performed on composite hemipelves and fixed with either three 4.5-mm bioabsorbable screws or three stainless steel 4.

Effects of a novel sterilization process on soft tissue mechanical properties for anterior cruciate ligament allografts.

Background: Allograft anterior cruciate ligament reconstruction provides benefits such as earlier return to activities and less pain, but concerns remain regarding potential infection and biomechanical stability.

Hypothesis: There is no difference in biomechanical properties of soft tissue allografts treated with the Biocleanse tissue sterilization process compared with irradiated and fresh-frozen allografts.

Study Design: Controlled laboratory study.

Titanium versus stainless steel for anterior spinal fusions: an analysis of rod stress as a predictor of rod breakage during physiologic loading in a bovine model.

Study Design: In vitro biomechanical evaluation of rod stress during physiologic loading of anterior scoliosis instrumentation.

Objectives: To determine effects of material properties and rod diameter on rod stresses in anterior scoliosis instrumentation.

Summary Of Background Data: Relationships between instrumentation dimensions, materials, and potential rod failure in anterior scoliosis instrumentation remain unclear.

Biomechanical comparison of a novel percutaneous transfacet device and a traditional posterior system for single level fusion.

Posterior spinal fusions are indicated for a variety of spinal disorders. Transfacet fixation minimizes soft tissue disruption and preserves the adjacent facet joint. This technique is uncommon due to concerns with biomechanical stability and proper implant placement.

Biomechanical stability of single-screw versus two-screw fixation of an unstable slipped capital femoral epiphysis model: effect of screw position in the femoral neck.

Purpose: To biomechanically evaluate single screw and varying 2 screw fixations for an unstable slipped capital femoral epiphysis (SCFE) model using physiologically relevant loading.

Study Design: In vitro biomechanical study.

Methods: Twenty-four immature porcine proximal femurs were prepared to simulate a mild-to-moderate unstable SCFE.

Biomechanical comparison of two different periarticular plating systems for stabilization of complex distal humerus fractures.

Background: Complex intra-articular distal humerus fractures are relatively uncommon injuries but are fraught with poor outcomes such as malunion, elbow stiffness and deformity. Various types of internal fixation screw-plate constructs have been developed to improve fixation. Specifically, a 90 degrees offset periarticular system lowers the profile on the lateral epicondyle, yet it is unclear how this design compares to other plate constructs.