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Meghan L. Critchley Daniel J. Davis Michaela M. Keener Jacob S. Layer Margaret A. Wilson Qin Zhu 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(4):421-437
ABSTRACT The purpose was to quantify the effects of mid-flight whole-body and trunk rotation on knee mechanics in a double-leg landing. Eighteen male and 20 female participants completed a jump-landing-jump task in five conditions: no rotation, testing leg ipsilateral or contralateral (WBRC) to the whole-body rotation direction, and testing leg ipsilateral (TRI) or contralateral to the trunk rotation direction. The WBRC and TRI conditions demonstrated decreased knee flexion and increased knee abduction angles at initial contact (2.6 > Cohen’s dz > 0.3) and increased peak vertical ground reaction forces and knee adduction moments during the 100 ms after landing (1.7 > Cohen’s dz > 0.3). The TRI condition also showed the greatest knee internal rotation angles at initial contact and peak knee abduction and internal rotation angles and peak knee extension moments during the 100 ms after landing (2.0 > Cohen’s dz > 0.5). Whole-body rotation increased contralateral knee loading because of its primary role in decelerating medial-lateral velocities. Trunk rotation resulted in the greatest knee loading for the ipsilateral knee due to weight shifting and mechanical coupling between the trunk and lower extremities. These findings may help understand altered trunk motion in anterior cruciate ligament injuries. 相似文献
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膝关节损伤是各种运动项目中运动创伤发病率最高的，经统计占25．82％[1]。应用推拿加平衡针疗法，治疗膝关节运动损伤32例，其中痊愈22例，占68．76％，显效8例占25％，进步2例，占6．25％。膝关节运动损伤的原因与专项技术特殊要求、忽视放松活动及动作不正确有关。 相似文献
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针刀松解法治疗膝骨关节炎临床对照研究 总被引：3，自引：0，他引：3
目的：通过与电针治疗膝骨关节炎的疗效进行对比，观察针刀对膝骨关节炎患者各项指标的影响以及总体疗效如何。方法：采用随机、对照的方法，试验组24例，采用针刀治疗；对照组24例，采用电针治疗。对比两组临床疗效。结果：（1）经过3周的治疗，电针组和针刀组均取得了一定的近期效果，与治疗前相比各项指标均有显著改善，两组的有效率比较无显著差异。（2）疗效的趋向性与治疗方法有关，针刀组更加趋向于临床治愈（P=0.04）。（3）两组患者治疗前后自身指标分值比较：疼痛、关节僵硬、生理功能、压痛、肿胀、关节活动度均有下降，具有统计学意义；针刀组与电针组治疗后各指标分值比较，疼痛、关节僵硬、生理功能、压痛、肿胀均无统计学意义。针刀组患者治疗后关节活动度显著优于电针组。结论：通过上述研究认为针刀治疗膝骨关节炎近期疗效良好，值得进一步深入研究。 相似文献
4.
文章通过太极拳运动对膝关节损伤的相关文献查询,得出常见的太极拳运动膝关节损伤病例,对文献结论分析得出造成损伤的因素有两个方面,一是动作技术不正确不规范造成,二是膝关节受力过重造成。通过对和式太极拳三直五顺拳理要求分析,得出五顺是太极拳动作技术要求,三直是减轻膝关节受力要求,与造成膝关节损伤的两个方面具有对应关系,提出三直五顺拳理对练习者的要求在保护膝关节损伤的重要性。 相似文献
5.
乒乓球运动是技战能主导类隔网对抗性项目,易致腕膝关节损伤。运用文献综述法和问卷调查法等研究方法,对华中师范大学体育学院乒乓球专项学生腕膝关节发生运动损伤的次数、时间、原因、伤后急救处理措施、恢复正常运动水平所需时长以及伤后对运动能力、心理的影响等方面进行调查分析,并针对这些问题提出相应的建议和预防措施,为乒乓球运动损伤的预防和处理提供理论参考。 相似文献
6.
Joshua T. Weinhandl Bobbie S. Irmischer Zachary A. Sievert Kevin C. Fontenot 《Journal of sports sciences》2017,35(2):166-174
Limb dominance theory suggests that females tend to be more one-leg dominant and exhibit greater kinematic and kinetic leg asymmetries than their male counterparts, contributing to the increased risk of anterior cruciate ligament injury among female athletes. Thus, the purpose of this study was to examine the influences of sex and limb dominance on lower extremity joint mechanics during unilateral land-and-cut manoeuvres. Twenty-one women and 21 men completed land-and-cut manoeuvres on their dominant limb as well as their nondominant limb. Three-dimensional kinematics and kinetics were calculated bilaterally for the entire stance phase of the manoeuvre. Women performed land-and-cut manoeuvres with altered hip motions and loads as well as greater knee abduction at touchdown compared to men. Dominant limb land-and-cut manoeuvres where characterised by decreased hip flexion at touchdown as well as decreased hip flexion and adduction range of motion compared to nondominant land-and-cuts regardless of sex. The observed sex differences are consistent with previous research regarding mechanisms underlying the sex disparity in anterior cruciate ligament injury rates. However, observed differences regarding limb dominances appear somewhat arbitrary and did not suggest that the dominant or nondominant limb would be at increased risk of anterior cruciate ligament injury. 相似文献
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三维重建法测量中国北方成人股骨膝外翻角(英文) 总被引：1，自引：0，他引：1
Tong LIU ;Chen-yu WANG ;Jian-lin XIAO ;Lan-yu ZHU ;Xue-zhou LI ;Yan-guo QIN ;Zhong-li GAO 《Journal of Zhejiang University. Science. B》2014,15(8):720-726
研究目的:利用三维重建影像模型获取膝外翻角,并通过使用这种方法来测量中国北方成人膝外翻角的平均估计值。创新要点:本研究所获取的膝外翻角平均值对于在中国北方人群进行膝关节置换术时有着重要的参考意义,新的三维重建测量法使得膝外翻角的术前个体化测量更加精确。研究方法:利用64名患者的CT血管造影(CTA)的DICOM数据获取共128件股骨三维重建模型。在重建的股骨模型上分别定位髁间凹最高点(点A)、膝关节线上20 cm截面的髓腔中点(点B)和股骨头旋转中心(点C)。之后膝关节外翻角即由股骨远端解剖轴(线AB)与股骨机械轴(线AC)所围成(上述定位过程详见图5)。经统计分析后,128件股骨的平均外翻角值为6.20°±1.20°。统计分析还发现,膝外翻角与个体年龄呈显著性正相关,同一个体的左右侧外翻角呈显著性正相关。重要结论:在对北方成年人群进行膝关节置换术时,选取外翻角为6°可会在重建人体下肢力线上获得更好的术后效果。在对年长患者进行手术时应选用更大的外翻角。 相似文献
9.
G. Dalleau B. Baron B. Bonazzi P. Leroyer T. Verstraete C. Verkindt 《Journal of sports sciences》2013,31(6):657-665
Abstract To enhance muscular strength, resistance training machines with a cam, incorporating a variable resistance moment arm, are widely used. However, little information is available about the influence of the variable resistance moment arm on torque, velocity, and power during muscle contraction. To address this, a knee extensor machine was equipped with a cam or with a semi-circular pulley that imposed a variable or a constant resistance moment arm, respectively. Fourteen physically active men performed two full knee extensions against loads of 40–80 kg in both conditions. Participants developed significantly higher torque with the pulley than with the cam (P < 0.001). The relative differences between pulley and cam conditions across all loads ranged from 8.72% to 19.87% (P < 0.001). Average knee extension velocity was significantly higher in the cam condition than in the pulley condition. No differences were observed in average and peak power, except at 50 and 55 kg. Torque–velocity and power–velocity relationships were modified when the resistance moment arm was changed. In conclusion, whatever the link, namely cam or pulley, the participants produced similar power at each load. However, the torque–velocity and power–velocity relationships were different in the cam and pulley conditions. The results further suggest that the influence of the machine's mechanism on muscular performance has to be known when prescribing resistance exercises. 相似文献
10.
研究对象为哈尔滨市第六医院康复科402例膝关节慢性创伤患者（2005年～2010年）,数据采集内容包括：年龄、性别、膝关节慢性创伤、体质指数、腰臀比。根据性别不同对数据进行数理统计分析,通过体质指数（BMI）和腰臀比（WHR）标准对患者的肥胖程度进行分析。根据数据结果显示男子通过腰臀比定义为肥胖的往往高于女士。腰臀比在评价受试者肥胖的比例明显高于BMI测定结果（P〈0．05）,尤以男性突出。在膝关节慢性创伤患者中,腰臀比（WHR）与男性、女性膝关节骨关节慢性创伤的患病率存在显著性相关,男性患者达到了非常显著行相关,而体质指数（BMI）没有达到显著性相关。 相似文献