background: this study aimed to investigate the pedicle dimension and angulation in cervicothoracic junction (ctj) using the findings of computed tomographic (ct) to help accurate insertion of pedicular screw. methods: forty three patients with high quality ct images of ctj were evaluated. pedicle width (pw), pedicle height (ph), pedicle axis length (pal), transverse angle (ta) and sagittal ang...

OBJECTIVES To evaluate the efficacy of osteosynthesis on femoral neck fractures using two instead of three screws. METHODS Thirty-nine fractures were retrospectively evaluated, divided into groups in which two screws were used in parallel (n = 28) or three screws (n =11) in an inverted triangle configuration (in accordance with the AO technique). The patients were then followed up until reach...

OBJECTIVE To present the accuracy and safety of cervical pedicle screw insertion using the technique with direct exposure of the pedicle by laminoforaminotomy. METHODS We retrospectively reviewed 12 consecutive patients. A total of 104 subaxial cervical pedicle screws in 12 patients had been inserted. We also assessed the clinical and radiological outcomes and analyzed the direction and grade...

We present a new modal access control logic ACL to specify, reason about and enforce access control policies. The logic includes new modalities for permission, control, and ratification to overcome some limits of current access control logics. We present a Hilbert-style proof system for ACL and a sound and complete Kripke semantics for it. We exploit Kripke semantics to define Seq-ACL: a sound,...

Anterior cruciate ligament (ACL) injuries are one of the most common injuries in orthopaedics. ACL injury can be treated either surgically or non-surgically. When surgery is performed, the torn ligament is replaced with a new tissue that will turn into ligament over time. The two main options are autograft, which means that the tissue used to reconstruct the ACL comes from you, and allograft, w...

This in vitro investigation compared the effect of using either gold or titanium retaining screws on preload in the dental implant- abutment complex. Inadequate preload can result in screw loosening, whilst fracture may occur if preload is excessive. These are the most commonly reported complications in implant-retained prostheses, and result in unscheduled, costly and time-consuming visits for...

Twenty-seven paired human cadaveric knee specimens were used to determine the effect of surgical technique and various interference screw parameters on the pullout strength of patellar tendon femoral bone blocks. The study compared the fixation strength of endoscopically inserted and conventional "rear-entry" screws of different diameters and lengths. In all tests the most frequent mode of fail...

BACKGROUND Anterior cruciate ligament (ACL) injury is often accompanied with medial collateral ligament (MCL) injury. Assessment of varus-valgus (V-V) instability in the ACL-deficient knee is crucial for the management of the concomitant ACL-collateral ligaments injury. We evaluated the V-V laxity and investigated the effect of additional posterior tibial load on the laxity in the ACL-deficient...

BACKGROUND Anterior cruciate ligament (ACL) injury is a devastating injury that puts an athlete at high risk of future osteoarthritis. Identification of risk factors and development of ACL prevention programmes likely decrease injury risk. Although studies indicate that sagittal plane biomechanical factors contribute to ACL loading mechanisms, it is unlikely that non-contact ACL injuries occur ...

The characteristics of anterior cruciate ligament (ACL)-derived mesenchymal stem cells (MSCs), such as proportion and multilineage potential, can be affected by donor age. However, the qualitative and quantitative features of ACL MSCs isolated from younger and older individuals have not yet been compared directly. This study assessed the phenotypic and functional differences in ACL-MSCs isolate...