Gao B.,University of Florida |
Gao B.,Exactech |
Cordova M.L.,University of North Carolina at Charlotte |
Zheng N.,University of North Carolina at Charlotte
Human Movement Science
Mechanical environmental changes in the knee are induced by altered joint kinematics under cyclic loading during activities of daily living after anterior cruciate ligament (ACL) injury. This is considered a risk factor in progressive cartilage degeneration and the early onset of osteoarthritis following ACL injury and even after reconstructive surgery. The purpose of this study was to examine 3D joint kinematics of ACL-deficient and ACL-reconstructed knees to health controls during stair ascent and descent. A 3D optical video motion capture system was used to record coordinate data from reflective markers positioned on subjects as they ascended and descended a custom-built staircase. Spatiotemporal gait and knee joint kinematic variables were calculated and further analyzed. The ACL-deficient knees exhibited a significant extension deficit compared to the ACL-intact controls. A more varus and internally rotated tibial position was also identified in the ACL-deficient knees during both stair ascent and descent. The ACL-reconstructed knees exhibited less abnormality in both spatiotemporal gait parameters and joint kinematics, but these variables were not fully restored to a normal level. The kinematic profiles of the ACL-reconstructed knees were more similar to those of the ACL-deficient knees when compared to the ACL-intact knees. This suggests that the ACL-reconstructed knees had been "under-corrected" rather than "over-corrected" by the reconstructive surgery procedure. Findings from this study may provide more insight with respect to improving ACL reconstruction surgical techniques, which may aid the early progression of cartilage degeneration in ACL-reconstructed knees. © 2011 Elsevier B.V. Source
Exactech | Date: 2012-02-07
Adjustable reverse shoulder prostheses are disclosed herein. A glenoid assembly includes a glenoid plate configured for fixation to a glenoid bone for a reverse shoulder prosthesis; a glenosphere configured for connection to the glenoid plate; and an adjustment plate, wherein the adjustment plate has a connection for directly engaging the glenosphere, and wherein the adjustment plate has an articulation for directly engaging the glenoid plate at a variable angular orientation. During a reverse total shoulder arthroplasty method, a glenoid plate is fixated to a glenoid bone; an adjustment plate, configured for interfacing with both the glenoid plate and a glenosphere, is locked to the glenoid plate, wherein the adjustment plate is configured for angular orientation or positional change relative to the glenoid plate; a glenosphere is connected to the adjustment plate; and an angular orientation and position of the glenosphere relative to the fixated glenoid plate is independently adjusted.
Exactech | Date: 2011-05-02
A dynamic bone stabilization system is provided. The system may be placed through small incisions and tubes. The system provides systems and methods of treating the spine, which eliminate pain and enable spinal motion, which effectively mimics that of a normally functioning spine. Methods are also provided for stabilizing the spine and for implanting the subject systems.
Exactech | Date: 2013-05-30
Disclosed herein are components of a reverse shoulder prosthesis. In an embodiment, a reverse shoulder prosthesis includes a humeral adapter tray configured to sit near a resected surface of a humerus, the humeral adapter tray comprising: a cavity; a central bore; and a distal face including a boss, the boss: (i) configured as an extension of the distal face, (ii) posteriorly offset from the central bore by at least 10 mm, and (iii) configured to engage a humeral stem; and a humeral liner comprising: a distal rim configured to sit within the cavity of the humeral adapter tray; and a concave articulating surface configured to mate with a convex articulating surface of a glenosphere. In an embodiment, the boss, in addition to being posteriorly offset, is superiorly offset from the central bore by at least 8 mm. In an embodiment, the reverse shoulder a humeral stem which engages the boss.
Exactech | Date: 2012-11-15
This disclosure describes devices and methods for performing spinal surgical procedures. In some embodiments, a method may include positioning at least a portion of at least one surgical instrument in at least one naturally occurring orifice of a human by a user. In some embodiments, a method may include accessing an interior space of the human using at least one of the surgical instruments. The method may include performing at least a portion of a spinal surgical procedure using at least one of the surgical instruments positioned in at least one of the naturally occurring orifices of the human. The method may include removing at least one of the surgical instruments from at least one of the naturally occurring orifices upon completion of at least a portion of the spinal surgical procedure.