Abstract

Objective To study the knee joint kinematic characteristics of general joint hypermobility (GJH) patients during level and downhill walking. Methods 18-24-year-old healthy college volunteers were recruited(Exclude the history of knee joint injury, etc) and divided into two groups: general joint hypermobility group (GJH group)(Beighton score ≥ 5, n=21) and normal group (n=49). The demographic information and questionnaires like IKDC 2000, Lysholm score of all subjects were investigated. The Beighton scoring system were assessed by the experienced operator. The gait analysis system was used to collect the data of the knee joint kinematic parameters. Independent sample t test and chi-square test were used for statistical analysis. Results There was no significant difference in flexion and extension angles between the GJH group and the normal group during level walking. However, compared to the normal group the GJH group showed a greater flexion angle in the swing phase than the normal group when walking downhill (maximum flexion angle): (67.40±5.48)°vs (62.27±6.57)°(t=-2.961, P<0.01). The GJH group showed a greater external angle and anterior translation during level walking (anterior/posterior translation in the middle stance phase, 12% gait) and downhill walking: (0.73±0.45)mm vs (0.23±0.27)mm(t =-4.713, P<0.001). The greater external angle and anterior translation (anterior/posterior translation in the middle stance phase, 12% gait): (0.78±0.62)mm vs (0.20±0.36)mm(Z =-3.873, P<0.001)increased more obviously when walking downhill. Conclusions The GJH patients present greater changes in gait parameters when walking downhill, which may be compensated by the muscles around the knee joint. As for the abnormal gait parameters, it is possible to enhance the muscle strength around the knee joint of the GJH patients through gait retraining and joint stability training, so as to enhance the stability of the knee joint. Key words: Joint laxity; Knee joint; Biomechanical phenomena; Walking

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