Four pairs of fresh-frozen cadaver knees (eight knees, four male knees) with a mean age of 72 ± 7 years were used for tests involving a customized simulator capable of controlling quadriceps loading conditions. The muscle force distribution of the quadriceps for the normal loading condition was applied on the basis of muscle cross-sectional area data, as previously reported (VM: 31 N; RF/VI: 49 N; VL: 45 N). To simulate vastus medialis (VM) impairment, we set the muscle force for VM in the muscle force distribution of the quadriceps at zero (VM: 0 N; RF/VI: 49 N; VL: 45 N). The joint reaction forces and moments on knee joints that underwent total knee arthroplasty (TKA) did not differ significantly according to VM impairment status for all flexion angles (p > 0.05). Nevertheless, the vectors of internal–external moments mostly showed a tendency for alteration from external to internal due to VM impairment. This tendency was evident in 9 cases in 12 total test pairs (with and without VM impairment). Furthermore, the vectors of the anterior–posterior reaction forces mostly showed a tendency to increase anteriorly due to VM impairment. This tendency was also evident in 9 cases in 12 total test pairs (with and without VM impairment). These results indicate that posterior dislocation of the tibia may be induced if VM impairment occurs after TKA. In conclusion, VM impairment in knee joints undergoing TKA may contribute to posterior dislocation of the tibia by a paradoxical roll-back with enhancements of the anterior joint reaction force and external moment during knee-joint flexion. Our findings may be valuable for understanding the mechanism of potential instability and malfunction due to VM impairment in knee joints after TKA, and may help to optimize clinical/rehabilitation training plans to improve the prognosis (stability and function) of knee joints undergoing TKA.

No abstract

Objective To explore the technical effectiveness evaluation of the teamwork model based on the three-way collaboration of medical, psychological and social support for the treatment of post-stroke depression. Methods 76 patients with post-stroke depression were selected in the rehabilitation department of a hospital. Patients are divided into control group and experimental group. The control group received routine medical and rehabilitation treatment, and the experimental group added psychological rehabilitation intervention on the basis of the control group. The results were assessed by the Hamilton Depression Rating Scale (HAMD), the 12 General Health Questionnaire (GHQ-12), and the Activity of Daily Living Scale (ADL) before and after treatment. Results The scores of the experimental group and the control group on the HAMD, GHQ-12, and ADL scales were lower than those before the treatment; and the experimental group scored on the HAMD, GHQ-12, and ADL after team-based treatment Significantly lower than the control group, the difference was significant (t =-16.219, p<0.001; t =-10.126, p < 0.001; t =-7.021, p < 0.001). Conclusion Psychological rehabilitation technology based on teamwork can reduce the degree of depression in patients with stroke depression, improve the mental health of patients, reduce the dysfunction of patients and improve their daily living ability. It has clinical reference and promotion.