摘要
目的前交叉韧带(anterior cruciate ligament,ACL)是膝关节重要的前向稳定结构,其功能受损会破坏关节正常的力学环境,探讨ACL切断对外侧半月板后角生物力学的影响。方法自愿捐献新鲜成年男性正常膝关节标本10个,均为非对称性,左、右膝关节各5个。将正常膝关节(ACL完整组)于屈膝0、30、60、90°位时,以0.5mm/s的加载速度对膝关节加载轴向载荷至200N,记录外侧半月板后角应变。正常膝关节测试后,将ACL中下1/3处全部切断(ACL切断组),同上法进行生物力学测试。计算两组外侧半月板后角应变比值。测试完毕后解剖并大体观察膝关节外侧半月板有无变形、撕裂等。结果ACL完整组在屈膝0、30、60、90°位时,外侧半月板后角应变分别为(—11.70±0.95)、(—14.10±1.95)、(—20.10±1.20)、(—26.50±1.58)με,ACL切断组分别为(—6.20±1.55)、(—26.30±1.89)、(—37.70±1.64)、(—46.20±2.78)με,两组应变在不同屈膝角度时差异均有统计学意义(P<0.05)。屈膝0、30、60、90°位时,外侧半月板后角应变比值分别为0.53±0.12、1.90±0.31、1.88±0.15、1.75±0.16。解剖学观察示外侧半月板外观完整,无变形、撕裂等。结论ACL切断后外侧半月板后角应变发生改变,外侧半月板后角承受的载荷使其处于损伤的高危状态。
Objective Anterior cruciate ligament（ACL）is an important forward stable structure of knees,when its function impaired,the normal mechanical environment of joint will be destroyed.Now,to explore the effect of ACL rupture on the posterior horn of lateral meniscus by measuring biomechanics.Methods Ten specimens of knee joints（5 left and 5 right sides asymmetrically）were donated voluntarily from 10 normal fresh adult male cadavers,aged 26-35 years with an average of 31.4 years.The straining of lateral meniscus posterior horn in 10 knee joint specimens before and after resection of ACL were tested when the knee joints loaded from 0 to 200 N at a velocity of 0.5 mm per second at 0,30,60,and 90°of flexion and recorded at the moment when the load was 200 N,the ratio of straining before and after resection of ACL were connted.All the specimens were anatomied and observed in general so as to find injuries such as deformation and tearing in lateral meniscus after test.Results The straining of lateral meniscus posterior horn were as follows：intact ACL group,（—11.70±0.95）μεat 0°flexion,（—14.10±1.95）μεat 30°flexion,（—20.10±1.20）μεat 60°flexion,and（—26.50±1.58）μεat 90°flexion;ACL rupture group,（—6.20±1.55）μεat 0°flexion,（—26.30±1.89）μεat 30°flexion,（—37.70±1.64）μεat 60°flexion,and（—46.20±2.78） μεat 90°flexion.There were significant differences between intact ACL group and ACL rupture group（P0.05）.The straining ratio of the posterior horn of lateral meniscus rupture ACL to intact ACL were 0.53±0.12,1.90±0.31,1.88±0.15,and 1.75± 0.16 at 0,30,60,and 90°of flexion.The lateral meniscus were intact in general and no injuries such as deformation and tearing were found.Conclusion ACL has a significant biomechanical effect on posterior horn of lateral meniscus.Consequently,the posterior horn of lateral meniscus is overloaded with ACL rupture at 30,60,and 90°of flexion,and thereby,it will have the high risk of tear.
出处
《中国修复重建外科杂志》
CAS
CSCD
北大核心
2010年第1期14-16,共3页
Chinese Journal of Reparative and Reconstructive Surgery
关键词
前交叉韧带
外侧半月板
后角
生物力学
Anterior cruciate ligament Lateral meniscus Posterior horn Biomechanics
