Kinesiology 2236A/B Lecture Notes - Lecture 18: Avulsion Injury, Weight-Bearing, Quadriceps Femoris Muscle
4 Jan 2021
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Document Summary
Long bone growth occurs at each end, around epiphyseal (growth) plates. Also have growth plates where tendons attach to bones aka apophysis. The epiphyseal plate is 2-5x weaker than the surrounding bone. 15-30% of all childhood fractures are growth plate fractures. Anatomical differences between adult and growing bones junction between growth plate and metaphysis is vulnerable. Typically, due to shear rotational force and compression, most resistant to tension. Physis 2-5x weaker than adjacent capsule or ligamentous structure. Periosteum is a major support through this area. Injury can be acute or from repetitive forces. Distal radius, supracondylar (elbow), distal tibia, fibula, femur. Stress fracture of the proximal epiphyseal plate of the humerus (11-16 year olds) Pain in dominant shoulder of athlete (tennis and volleyball too) Recent increase in fitt (frequency, intensity, time, type) Treatment is abstinence from throwing for 4-6 weeks. Bones do well tolerating traction, about 214nm = 5% of tolerated load.
