To investigate the effect of visual feedback training of medial femoral muscle guided by B ultrasound on the improvement of knee function after total knee arthroplasty.

Sixty-five patients after total knee arthroplasty in the department of orthopedics of the Second People's Hospital of Kunming were selected, and were randomly divided into two groups by random number table method: 32 patients in the control group and 33 patients in the observation group. The control group received routine nursing, health education, muscle strength training, proprioception training, range of motion training and conventional medial femoral muscle training.Besides all these, the observation group were given visual biofeedback training of the medial femoral muscle under the guidance of B ultrasound. The course of treatment was three weeks and was assessed using the Hospital for Special Surgery knee scoring system (HSS). The data were analyzed by t test.

After three weeks of treatment, all factors and total scores in HSS scores of the two groups were significantly changed compared with those before treatment. All factors and total scores in the observation group were better than those in the control group, and the difference was statistically significant (t=6.93, P<0.05).

The visual biofeedback training of the medial femoral muscle under the guidance of B ultrasound is more conducive to the improvement of the patients' motor function after total knee arthroplasty, which is worthy of clinical promotion.