| Objective: To observe the characteristics of 3D knee kinematics during gait cycle of elderly patients with knee osteoarthritis (KOA), and so as to provide reference for designing rehabilitation training for patients with KOA. Methods: Totally, 29 patients with KOA served as the observation group and 15 people without KOA as the control group. The age, height, weight and body mass index (BMI) of the two groups were matched. The KneeKG system was used to measure the 3D range of motion of knees during walking under full weight bearing condition in both groups. Results: The knee flexion-extension range, knee flexion angle in swing phase and walking speed in the sagittal plane in the observation group were significantly reduced, but knee flexion angle was significantly increased in stance phase as compared with those in the control group (P<0.05). In the frontal plane, the adduction angle in the observation group was significantly larger than in the control group at heel strike (P<0.05). In the horizontal plane, the tibia in the observation group moved posterior obviously at heel strike, and the internal-external tibia rotation in the observation group was significantly smaller than in the control group (P<0.05). Conclusion: The elderly KOA patients presented abnormal screw-home mechanism. The motion in the sagittal plane was stiff and the stability in the frontal plane was lower; meanwhile, the internal-external tibia rotation decreased and the tibia tended to deviate posterior. |
