B-15 Comparison of Osteoarthritic Knee Kinematics and Kinetics with Age Matched Healthy Individuals

It has long been established that individuals who suffer from osteoarthritis (OA) present with altered kinematics and kinetics during gait. Many studies have looked at the knee kinematics and kinetics, however the consequences of this asymmetry on the non-effected limb has not been explored. This study aims to investigate the knee kinematics and kinetics during gait for pre-operative OA patients when compared to healthy age and sex matched individuals. Fifteen pre-operative (Knee Arthroplasty; KA) OA patients, and 10 age and sex matched healthy (H) individuals were recruited, with institutional and hospital ethical approval sought prior to testing. Each participant underwent function screening tests using a 12 Item Oxford Knee Score and the Western Ontario and McMaster University Osteoarthritis Index (WOMAC). Participant’s gait was then analysed in a motion capture session (VICON, Oxford, UK) during five trials within one session. Motion capture and force plate data were then processed into participant specific musculoskeletal models using AnyBody inverse dynamic modelling software (Aalborg, Denmark). Results showed significantly lower perceived ability in activities of daily living in the OA group (p < 0.001), with mean WOMAC and 12 item Oxford Knee scores of 50.2 (H=0) and 20.8 (H=48) respectively. Kinematics showed a large difference between groups in the range of motion of the knee, with the OA group exhibiting a average 6.2° (H=0.1°) less peak extension and 3.9° (H=0.1°) less peak flexion between affected and unaffected limbs during gait (Table 1). Knee kinetics showed considerable differences between groups, with increased valgus-varus and internal-external rotation moments (Table 1) in the OA group. The affected limb also exhibited decreased flexion moment (2.7% BW×Nm) during stance phase of gait (Table 1).