PMC5569870_01
Photo of the hybrid assistive limb (HAL) on the patient (a). The patient is a 76-year-old male who underwent right TKA for grade 4 knee OA (Kellgren-Lawrence scale). Photo of the HAL training during walking (b).
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HAL training was performed 12 times over 4 weeks, beginning one week after surgery (week 1 to week 5; Figure 1).
Kinematics of the gait analysis, pre- and postoperative. (a) represents knee flexion-extension and (b) represents knee varus-valgus during gait cycle. The part surrounded by the square in the figure shows the feature of knee kinematics change.
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The pre- and postoperative kinematic gait results are shown in Figure 2. The restricted knee extension seen preoperatively at MSt was improved after treatment (Figure 2(a)). The knee varus thrust in the frontal plane from IC to LR disappeared after surgery (Figure 2(b)). The knee abductor moment decreased after surgery, and the patient could exert a knee extensor moment from IC to MSt after the operation (Figure 3).
Pre- and postoperative knee joint moments. (a) represents knee extensor-flexor and (b) represents knee adductor-abductor moment during gait cycle.
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The knee varus thrust in the frontal plane from IC to LR disappeared after surgery (Figure 2(b)). The knee abductor moment decreased after surgery, and the patient could exert a knee extensor moment from IC to MSt after the operation (Figure 3).