The purpose of this investigation was to document the influence of the anterior cruciate ligament (ACL) in controlling the dynamic interaction between the femur and tibia. Twenty subjects were initially selected to participate based on the results of arthroscopic and proprioceptive tests which established the presence of a uni-lateral, third degree rupture of the ACL. A spline function established the best fitting curve of the instant center (IC) coordinates obtained throughout the ROM. Displacement variables were extrapolated from joint rotation profiles generated from these coordinates. Abnormal displacement migrations of the IC parameter were demonstrated to occur in extension. Migration displacements evaluated between 30$ sp circ$ and 0$ sp circ$ shifted anteriorly 5.07 $ pm$ 1.86 mm for intact knees and 6.97 $ pm$ 2.06 mm for involved knees. This was determined to be significant at the 0.05 level of confidence and correlated well with clinical findings. Mean migration displacements evaluated in flexion (between 100$ sp circ$ and 70$ sp circ)$ were not found to differ significantly between knee conditions.

No description available.

Movement variability that occurs while performing repetitions of any particular motion can be due to errors in one’s ability to select the required parameters for executing the movement. However, it has been suggested that an optimal amount of variability exists in a healthy system providing adaptability to varying situations while producing negligible errors. Investigation of the consistency of movement variability in a system may provide information regarding joint control and integrity since the functionality of a system can be disrupted by injury. Rupture of the anterior cruciate ligament is associated with deficits in knee joint stability and mobility, as well as altered movement patterns. There is value in developing a simple clinical test that can measure knee joint stability and evaluate the degree of knee damage and rate of progress during rehabilitation. The main objectives were to investigate the normal range of variability during repeated knee extensions in healthy subjects and subjects with a reconstructed anterior cruciate ligament, and to evaluate the reliability of the method. There were 30 participants in the control group and 8 in the subject group. All were physically active a minimum of 2-3 times per week for a total of 2-3 hours. Mean variance and mean correlation were used to evaluate variability in this study. Change in mean variance and mean correlation, standard error of measurement and intra-class correlation coefficient were used to evaluate reliability. The results showed the range of values for movement variability in control and subject groups. Standard error of measurement indicated mean correlation (1.31% to 2.38%) was more reliable than mean variance (21.80% to 54.87%). Mean variance and mean correlation significantly increased with speed, and mean correlation was significantly higher for dominant legs during trials at 70 beats per minute. / Thesis (Master, Kinesiology & Health Studies) -- Queen's University, 2014-06-02 12:18:42.802

Thesis (MAppSc in Physiotherapy)--University of South Australia, 1995

Thesis (Ph.D.)--University of Western Australia, 2006.

Thesis (Ph. D.)--University of Sydney, 2004. / Title from title screen (viewed Apr. 6, 2009) Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Physiotherapy, Faculty of Health Sciences. Includes bibliography. Also available in print form.

Thesis (Ph. D.)--Oregon State University, 2009. / Printout. Includes bibliographical references (leaves 128-162). Also available on the World Wide Web.

Thesis (Ed. D.)--Boise State University, 2009. / Includes abstract. Appendix G has separate title: The effects of gender on the muscle activation, kinetics and kinematics at the hip during a jump, land, and unanticipated cut task in adolescent basketball athletes. Includes bibliographical references.

Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.

Thesis (Ed. D.)--Boise State University, 2009. / Title from t.p. of PDF file (viewed May 28, 2010). Includes abstract. Appendix G has separate title: The effects of gender on the muscle activation, kinetics and kinematics at the hip during a jump, land, and unanticipated cut task in adolescent basketball athletes. Includes bibliographical references.