This document discusses active and passive insufficiency in muscles. Active insufficiency occurs when a multi-joint muscle shortens over both joints simultaneously, losing tension. Passive insufficiency occurs when a multi-joint muscle is lengthened to its fullest extent at both joints, preventing full range of motion. Examples given are the rectus femoris causing active insufficiency in hip flexion and knee extension together, and the flexor digitorum profundus losing the ability to make a tight fist when the wrist is flexed. The relationship between them is that when the agonist contracts, the antagonist relaxes or lengthens, so the extensibility of the antagonist can limit the agonist's capability,
Two adjacent vertebrae and the associated soft tissues are considered as the functional unit of the spine.
Prehension involves grasping objects between surfaces of the hand. There are two main types of prehension - power grip and precision handling. Power grip uses flexion of all fingers and the thumb acts as a stabilizer. Precision handling involves skillful placement of an object between the fingers and thumb. There are different grips for various shaped objects including cylindrical, spherical, hook, and lateral grips. Precision handling requires finer motor control and includes pad to pad, tip to tip, and pad to side grips. The functional position of the wrist and hand allows equal tension across all wrist muscles.
This document provides an overview of biomechanics of the elbow, including its structure, function, kinematics, muscle actions, and stability mechanisms. It describes the three joints that make up the elbow complex - the humeroulnar joint, humeroradial joint, and proximal radioulnar joint. It details the motions of elbow flexion/extension and forearm pronation/supination, identifying the muscles, ligaments, and bony structures involved in each motion. Common injuries to the elbow from direct stresses and repeated stresses are also summarized.
a detailed description on theory behind Strength duration curve, along with procedure for plotting SD Curve and measuring the Rheobase and Chronaxie of the plotted graph.
The document summarizes key aspects of human walking (gait) including: - The gait cycle is divided into stance and swing periods, with distinct functional tasks in each. - Gait parameters like velocity, cadence, stride length are described. - Determinants of gait like pelvic rotation, knee flexion, and foot/ankle mechanics help minimize vertical displacement of the center of gravity and increase efficiency. - Gait analysis methods including observational, quantitative techniques like kinetics, electromyography, motion capture are outlined. Different pathological gaits like amputee, ataxic, and spastic gaits are also briefly discussed.
Here are potential answers to your questions: If you fall down to the ground with wrist hyperextension, you could injure the ligaments and bones in your wrist. The most common injuries are: - Ligament sprains of the dorsal radiocarpal ligaments which stabilize the wrist in extension. A sprain means the ligament is stretched or torn. - Fractures of the distal radius bone. Since the wrist bone is forcefully hyperextended, it can fracture at the end of the radius bone near the wrist joint. Instability generally refers to a lack of stability in a joint. In the wrist, instability means the bones and ligaments can no longer properly control and