Focal muscle spasticity has little impact on muscle power for walking in people with Traumatic Brain Injury

•First study reporting effect of focal muscle spasticity on gait kinetics in Traumatic Brain Injury.•Significant differences in muscle power between Traumatic Brain Injury and healthy controls.•Little difference in muscle power for those with and without focal muscle spasticity.•Few participants with Traumatic Brain Injury had focal hamstring or rectus femoris spasticity.