Medicine and Health Sciences Commons^™

Design And Development Of A Novel Expanding Pedicle Screw For Use In The Osteoporotic Lumbar Spine, Parham Rasoulinejad

Electronic Thesis and Dissertation Repository

Pedicle screws are commonly utilized in spinal surgery; however, traditional designs often do not provide adequate fixation in osteoporotic spines. The objective of this thesis was to develop a novel expanding screw for use in osteoporotic lumbar pedicles. Helical screws capable of expanding post insertion were built on a rapid prototype machine. A materials testing machine performed axial load to failure tests in both Sawbones and cadaveric specimens comparing the new design to traditional screws (rate = 10mm/min to 20 mm). Output parameters included yield load, ultimate load, stiffness, energy to failure and total energy. The expanding screw showed a …

Complex Shoulder Instability: The Role Of The Latarjet Coracoid Transfer, Ryan Degen

Electronic Thesis and Dissertation Repository

Recurrent anterior shoulder instability is a common clinical entity often requiring surgical stabilization. Recurrence rates following soft-tissue stabilization procedures are moderately high and have been attributed to associated bony defects of either the glenoid or humeral head. Complex shoulder instability, defined as instability associated with bony defects around the shoulder, is a challenging clinical problem. The Latarjet coracoid transfer has been proposed as a treatment option and its resultant stabilizing effects have been explored in this biomechanical cadaver-based study.

For both glenoid and humeral head defects, the Latarjet coracoid transfer adequately stabilized the shoulder, outperforming other procedures often utilized for …

What's New In Adult Reconstructive Knee Surgery., Carl A Deirmengian, Jess H Lonner

Rothman Institute Faculty Papers

No abstract provided.

The Effects Of A Semi-Rigid Ankle Brace On A Simulated Isolated Subtalar Joint Instability, Julie Choisne, Matthew C. Hoch, Sebastian Bawab, Ian Alexander, Stacie I. Ringleb

Mechanical & Aerospace Engineering Faculty Publications

Subtalar joint instability is hypothesized to occur after injuries to the calcaneofibular ligament (CFL) in isolation or in combination with the cervical and the talocalcaneal interosseous ligaments. A common treatment for hindfoot instability is the application of an ankle brace. However, the ability of an ankle brace to promote subtalar joint stability is not well established. We assessed the kinematics of the subtalar joint, ankle, and hindfoot in the presence of isolated subtalar instability, investigated the effect of bracing in a CFL deficient foot and with a total rupture of the intrinsic ligaments, and evaluated how maximum inversion range of …