| Objective: to understand the characteristics of knee joint pain related structural and functional changes of 13-16-year-old basketball players,discuss the injury factors,and provide countermeasures for scientific and reasonable exercise.Methods: 75 subjects(male)aged 13-16 years were divided into three groups: 25 in healthy group(H),25 in injured group(S)and 25 in control group(O).The joint mobility test,peak torque test of lower extremity,eye closed standing test of single foot,and neuromuscular control test of lower extremity were carried out respectively.Results: active hip rotation(39.01±5.28 vs 42.36±5.10)and passive hip rotation(34.52 ± 5.33 vs 35.73 ± 5.88),there was a significant difference between the injured group and the healthy group(P<0.05);in the lower extremity peak torque test,the isometric test showed that the MVC extension in the healthy group was greater than that in the injured group(P<0.05),the MVC flexion in the healthy group was greater than that in the control group(P<0.01),the concentric distance test showed that the60°/s extension,60°/s flexion in the healthy group and the injured group were greater than that in the control group(P<0.05),and the concentric distance test showed that the 240°/s extension in the healthy group was greater In the injury group(P<0.05),240°/s flexion group was larger than the injury group(P<0.01),in the eccentric distance test,60°/s extension group was larger than the injury group(P<0.05),60°/s flexion group was larger than the injury group and the control group(P<0.05),240°/s extension and 240°/s flexion group were larger than the injury group(P<0.05),and there was no significant difference between the eyes closed standing test group and the control group;There was no significant difference between the healthy group and the injured group in neuromuscular control test.After the training of lower extremity centrifugal force,MVC extension(dominant leg: 165.2±4.8 vs155.2±4.1;non dominant leg: 158.2±3.8 vs 141.2±3.1),MVC flexion(dominant leg: 86.1±2.6 vs 76.1±2.5;non dominant leg: 79.4±2.3 vs 71.4±2.7),concentric distance 60°/s extension(dominant leg: 148.7±4.2 vs 143.7±4.3;non dominant leg: 139.3±3.3 vs 130.1± 2.3),concentric distance 60°/ s flexion(dominant leg: 108.9 ± 2.9 vs 100.3 ± 2.2;non dominant leg: 99.1±2.5 vs 90.7±2.6),eccentric distance 60°/s flexion(dominant leg: 136.3±4.2 vs 121.3±4.2;non dominant leg: 118.4±3.2 vs 105.4±2.2)had significant difference(0.01<p<0.05),and all showed that the experimental group was more than the control group.The results show that: 1.The knee pain of basketball players in 13-16 years old has nothing to do with balance ability and neuromuscular control ability,which is not the main cause of knee pain,while the hip rotation is related to injury,which is the main manifestation of knee pain.2.The compensatory movement of body center of gravity,leg flexion and other behaviors occurred during the landing and other technical actions,so this situation can be used as a reference index to judge the early knee pain of basketball players at the age of13-16.3.The youth of 13-16 years old should pay attention to the flexibility and stability of the lower limbs when they are engaged in basketball,especially the posterior thigh group and adductor group,and take physical exercise on the premise of functional prevention.4.For the 13-16-year-old basketball fans,the centrifugal training of lower limbs with self elastic band and self weight as load can effectively improve the muscle strength level of lower limbs,and it can effectively reduce the risk of knee joint injury after training and exercise. |
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