In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical change occurs. A chemical mechanism describes in detail exactly what takes place at each stage of an overall chemical reaction (transformation). It also describes each reactive intermediate, activated complex, and transition state, and which bonds are broken (and in what order), and which bonds are formed (and in what order).
Grade IV capsular contracture in the right breast of a 29 y.o. woman, seven years after subglandular placement of 560cc silicone gel-filled breast implants. Capsular contracture is a response of the immune system to foreign materials in the human body. Medically, it occurs mostly in context of the complications from breast implants and artificial joint prosthetics.
Volkmann contracture is a deformity of the hand, fingers, and wrist caused by injury to the muscles of the forearm.his usually occurs when there is increased pressure due to swelling, a condition called compartment syndrome. Injury to the arm, including a crush injury or fracture, can lead to swelling that presses on blood vessels and can decrease blood flow to the arm.