#5 The Relationship of Kinematic Measurements and Quality of Movement Between Healthy and ACL-Injured Adolescent Females
Alixandra Bellemare, University of Manitoba and Pan Am Clinic Foundation; Alison Bulow, University of Manitoba and Pan Am Clinic Foundation; Judy Anderson, University of Manitoba and Children’s Hospital Research Institute of Manitoba; Jeff Leiter, University of Manitoba and Pan Am Clinic Foundation; Jason Peeler, University of Manitoba and Children’s Hospital Research Institute of Manitoba
Active female adolescents are 4-6x more likely to sustain an Anterior Cruciate Ligament (ACL) injury compared to their male counterparts. Reach distance (RD) on the Y-Balance Test (YBT) is a common clinical assessment of dynamic balance. Literature reports a relationship between anterior RD asymmetry and injury rate, yet there is no evidence to show the quality of movement (QOM) or kinematic measurements (KM) infer proper dynamic balance. A measure of QOM or KM of the YBT has yet to be considered, and may provide a better assessment. Our hypothesis was that the healthy participants would move better than the injured participants according to the QOM and KM.
Twenty-five healthy and ten ACL-injured recreationally active adolescent females were recruited for the laboratory study. The anterior reach of the YBT was completed according to previously established protocols. Kinovea software was used to measure knee flexion, ankle dorsiflexion, and frontal plane projection (FPPA) angles from video recorded at frontal and sagittal views of the participant. QOM was assessed by a previously validated protocol used for unilateral step-down tasks, grouping participants into good, moderate and poor movement categories. ANOVAs and frequency calculations were used to assess the relationships.
Participants were females 14.4±1.6 years, with BMI=22.7±4.8 kg/m2. (see supplemental uploads for tables) Overall, a majority of participants scored in the moderate range on QOM. Video data suggested that there were no significant differences between the groups when evaluating frontal and sagittal plane joint movements.
This data suggests that QOM and joint angle measurement of the YBT are not useful methods to differentiate between injured and healthy individuals in this population. This data does not support our hypothesis. In future research, the focus may need to be more specific to knee movement instead of overall movement quality or the RD achieved.