Joseph Crisco

..Potential applications include the quantification of normal wrist motion, analysis of pathomechanics, and evaluation of surgical intervention. The technique is also applicable to other joints and imaging modalities...

..The exponential decay function including both frictional and constant viscous damping presented herein dramatically increased the accuracy of measuring the COF in a pendulum test of modelled whole articular joints...

..The purpose of the present study was to determine the mechanical properties of the wrist in twenty-four different directions of wrist motion...

..These findings suggest that alterations in joint mechanics and soft tissues may play an important role in the dysfunction associated with these injuries...

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..It is capable of applying physiologic compressive loads at dynamic rates without constraining the kinematics of the joints, crucial requirements for testing FSUs in vitro...

..A 10% error in magnitude and a 10 deg error in impact location were achieved using as few as six single-axis accelerometers mounted on a hemispherical headform...

..g. 434+/-91 and 443+/-154 N failure load values, respectively) of the two impact-tested groups. Our findings suggest that the rabbit MCL is not viscoelastic at loading rates approximating those associated with high-energy trauma...

..Measuring head impact exposure is a critical step toward understanding the mechanism and prevention of sport-related mild traumatic brain (concussion) injury, as well as the possible effects of repeated subconcussive impacts...

..The purpose of this study was to determine the effects of swing speed, impact location, and elastic properties of the bat on batted ball speeds...

..The purpose of this study was to measure the three-dimensional conformational changes of the carpal bones in the normal wrist as a result of a static distractive load...

..Displacement errors below 2% using the cubic quaternion method were achieved using 4% of the total samples, representing a decrease in error over the other algorithms...

..Soft tissues may play a larger role in limiting function than previously appreciated, and treatment may require correction of altered soft tissue structures as well as any abnormal bone anatomy...

..Scaphoid nonunions are a common complication of scaphoid fractures and frequently progress to degenerative arthritis. This study evaluated the effect of scaphoid nonunion on the in vivo kinematics of the radioscaphocapitate articulation...

..3-D coordinate systems defined by the anatomy of the carpal bone, such as the ones presented here, are necessary to completely describe 3-D changes in the posture of the carpal bones...

..The purpose of this study was to compare 2 methods of calculating a screw axis accessible via a volar surgical approach...

..This cartilage model can serve as an effective building block for a future forward-dynamic predictive model of the human wrist...

..The biplanar fluoroscopy hardware and computational methods described here should make XROMM an accessible and useful addition to the available technologies for studying the form, function, and evolution of vertebrate animals...

..Scapholunate interosseous ligament elongation was minimal as the wrist was positioned along the dart thrower's path...

..Results on human wrist data show average accuracy improvements of 74% over grey-value registration. The method is of interest to any intrasubject, same-modality registration applications where subvoxel accuracy is desired...

..Since this segmentation method does not rely on domain-specific knowledge, it should be applicable to a range of other medical imaging segmentation tasks...

..01 and 0.05, respectively). VD was similar in both groups and did not change with time. Our data suggest that weight bearing stimulates new vessel formation during distraction osteogenesis...

..Results suggest that the method could be useful in the study of normal and injured anatomy and kinematics of complex joints...

..Additional work will be required to determine whether our results reflect the protocols used to prepare and fabricate the SIS grafts used in the study or the inherent inability of SIS to support new bone growth...

..The etiology of abnormal wrist kinematics in the asymptomatic wrist of patients with unilateral tears of the scapholunate ligament is not known...

..The presented algorithm provides an alternative method for automatically determining subject-specific ACSs from the distal femur and proximal tibia...

..We hypothesized that the wrist follows an oblique path from radial extension to ulnar flexion and that there would be minimal radiocarpal motion during the hammering task...

..59, p = 0.001) with an increase in the area of pressure distribution. These findings are a limited, but crucial, first step in understanding the prevention of this complex and perplexing phenomenon...

..However, the ball-and-socket model of the wrist is an insufficient description of the complex motion of the capitate with respect to the radius. These findings may aid in the design of wrist external fixation and orthotics...

..Since balls with low compression loads can pass through face protectors worn by lacrosse players, the sport's governing bodies may wish to consider a specification on ball compression...

..This study tested the hypothesis that radioscapholunate fusion alters the kinematic behavior of the remaining lunotriquetral and midcarpal joints, with specific focus on the dart-thrower's motion...

..7 m/s (1.5 mph) faster than stick tip speed. Some lacrosse stick models can shoot the ball significantly faster than predicted when considering the stick as a rigid, passive extension of the player's hands...

..We sought to reduce these stress risers. We hypothesize that resorbable screws used as hole fillers would (1) provide immediate strength and (2) maintain this strength during resorption...

..While there are numerous digital anatomical databases, this one is unique in that it includes a large number of subjects and it contains in vivo kinematic data as well as the bony anatomy...

..Not all combined moment axis values can be predicted from principal moment axis values...

..The extensive database of dimensions provided in this study should be useful in the design and insertion of fixation systems and implants...

..Overall the NeuFlex implant most closely matched the ICR, tendon excursion, and moment arm when compared with the intact native MCP joint...

..The Exp mu model provided a more accurate fit to the experimental data for predicting the frictional properties of intact joints in pendulum systems...

..We theorize that our configuration produces a biomechanically stronger construct than previously used methods...

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..01). No significant differences in COF or lubricin concentration were found between the no OA and mild OA knees. Histology verified the extent of cartilage damage in each group...

..Self-myofascial release (SMR) is a technique used to treat myofascial restrictions and restore soft-tissue extensibility...

..96. These data demonstrate that this method could be used to measure the amount of meniscal tissue excised during partial meniscectomy to within 125.7 mm(3)...

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..However, an accurate three-dimensional understanding of carpal motion is critical for academic and clinical purposes, and may play an important role in assessing surgical procedures or rehabilitation protocols...

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..To measure and analyze head accelerations during American collegiate football practices and games...

..To demonstrate the suitability of this model we fit to several different bones in the hand, and to the same bone from multiple people...

..These discoveries will lead to new treatments for wrist disease and trauma, which affect men and women of all ages, and account for significant medical expenses and lost productivity each year. ..

..Understanding how the carpus and distal forearm function is crucial to reducing work-related upper extremity musculoskeletal disorders. ..

..Our goal is to generate information that will improve the evaluation, diagnosis and treatment of wrist injury. ..

..These discoveries will lead to new treatments for wrist disease and trauma, which affect men and women of all ages, and account for significant medical expenses and lost productivity each year. ..