| Failure Strength and Pattern of the Common Extensor and Flexor Origins of the Humeral Epicondyle after Tensile and Cyclic Loading |
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Chung Soo Han,Kwan Hee Lee,Jai Young Ryu,Kyu Jung Cho,Heung Sik Kang,Ki Wook Kim |
| 인장하중 및 반복하중에 의한 상완골 내-외과의 골-인대 연결부 손상 |
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한정수,이관희,유재영,조규정,강흥식,김기욱 |
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| Abstract |
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Mechanical properties of humeral bone-tendon specimens of the common extensor and flexor origins were investigated in human cadavers. Complete or partial failure sites of specimens were carefully observed histologically after tensile and cyclic loadings. A correlation between strain changes and number of cycles was also investigated to obtain data about failure threshold. Complete or partial failure occurred at the same site: the transitional zone, which is the uncalcified fibrocartilaginous zone, between tendon and bone of the humeral epicondyle. Histological observation revealed that failure initiated at the upper, medial aspect of the extensor carpi radialis brevis origin. No statistically significant differences in ultimate tensile strength was found between male and female specimens or between slow and fast elongation rates. However, the flexor was significantly stronger than the extensor. The threshold of failure was unable to be measured because of the specimen variations. Mechanical and histological data obtained in this study indicated that the uncalcified fibrocartilaginous zone at the humeral bone-tendon junction of the common extensor and flexor origins can be the initial site of epicondylitis and that epicondylitis can be classified as a cumulative trauma disorder. |
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