Phillip M Reyes

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STUDY DESIGN Seven different combinations of posterior screw fixation, with or without interbody support, were compared in vitro using nondestructive flexibility tests. OBJECTIVE To study the biomechanical behavior of a new cortical screw (CS) fixation construct relative to the traditional pedicle screw (PS) construct. SUMMARY OF BACKGROUND DATA The CS(More)
OBJECTIVE To study the alteration to normal biomechanics after insertion of a lumbar interspinous spacer (ISS) in vitro by nondestructive cadaveric flexibility testing. METHODS Seven human cadaveric specimens were studied before and after ISS placement at L1-L2. Angular range of motion, lax zone, stiff zone, sagittal instantaneous axis of rotation (IAR),(More)
OBJECT An interspinous anchor (ISA) provides fixation to the lumbar spine to facilitate fusion. The biomechanical stability provided by the Aspen ISA was studied in applications utilizing an anterior lumbar interbody fusion (ALIF) construct. METHODS Seven human cadaveric L3-S1 specimens were tested in the following states: 1) intact; 2) after placing an(More)
STUDY DESIGN In vitro assessment of rib cage biomechanics in the region of true ribs with the ribs intact then sequentially resected in 5 steps. OBJECTIVE To determine the contribution of the rib cage to thoracic spine stability and kinematics. SUMMARY OF BACKGROUND DATA Previous in vitro studies of rib cage biomechanics have used animal spines or human(More)
STUDY DESIGN A new anchored spacer-a low-profile cervical interbody fusion cage with integrated anterior fixation-was compared biomechanically to established anterior cervical devices. OBJECTIVE To evaluate the fixation properties of the new stand-alone device and compare these properties with established fixation methods. The hypothesis is that the new(More)
OBJECT To study the stability offered by a clamping lumbar interspinous anchor (ISA) for transforaminal lumbar interbody fusion (TLIF). METHODS Seven human cadaveric lumbosacral specimens were tested: 1) intact; 2) after placing ISA; 3) after TLIF with ISA; 4) with TLIF, ISA, and unilateral pedicle screws-rod; 5) with TLIF and unilateral pedicle(More)
UNLABELLED The Food and Drug Administration has not cleared the following medical devices for the use described in this study. The following medical devices are being discussed for an off-label use: cervical lateral mass screws. OBJECT As an alternative for cases in which the anatomy and spatial relationship between C-2 and a vertebral artery precludes(More)
OBJECT Posterior screw-rod fixation for thoracic spine trauma usually involves fusion across long segments. Biomechanical data on screw-based short-segment fixation for thoracic fusion are lacking. The authors compared the effects of spanning short and long segments in the thoracic spine. METHODS Seven human spine segments (5 segments from T-2 to T-8; 2(More)
BACKGROUND CONTEXT Most one-level anterior cervical plates use two screws per vertebra (four screws in total). No study has addressed whether a simplified plate using one screw per vertebra is adequate for one-level fixation. PURPOSE To compare stability achieved by four-screw and two-screw plates after discectomy and placement of interbody spacer. (More)
BACKGROUND CONTEXT The transforaminal lumbar interbody fusion (TLIF) technique supplements posterior instrumented lumbar spine fusion and has been tested with different types of screw fixation for stabilization. Transforaminal lumbar interbody fusion is usually placed through a unilateral foraminal approach after unilateral facetectomy, although(More)