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Biomechanics Chp 5
Functional Anatomy of the Upper Extremeties Chapter 5 Biomechanics
| Question | Answer |
|---|---|
| What is the point of skeletal attachment of the upper extremity to the trunk occurs where? | Sternoclavicular joint. |
| Clavicle? | Joined at the manubrium or the sternum. |
| What four roles does the clavicle serve as? | Serving as a site of muscular attachment, providing barrier to protect underlying structures, acting as a strut to stabilize the shoulder and prevent medial displacement when the muscles contract, and preventing on inferior migration of the shoulder. |
| Glenoid fossa? | Depression in lateral superior scapula. Socket for shoulder joint. |
| Glenoid Labrum? | Ring of fibrocartilage around rim of glenoid fossa. Deepens socket for shoulder joint. |
| Bursa? | Fibrous, fluid-filled sac that reduces friction. Located between bones, tendons, and other structures. |
| Elevation and Depression of the shoulder complex? | When the clavicle moves superiorly and inferiorly. |
| How many degrees of freedom does the sternoclavicular joint have? | Three degrees of Freedom. |
| Protraction and Retraction of the clavicle? | When the clavicle moves anteriorly and posteriorly in the tranverse plane. |
| Where is the acromioclavicular joint? | Articulation between acromion process of scapula and lateral end of clavicle. |
| Where does elevation and depression take place? | Between the clavicle and the meniscus in the sternoclavicular joint and have a ROM of 30 degrees to 40 degrees. |
| Where does protraction and retraction occur? | These movements occur between the sternum and the meniscus in the joint through a ROM of 30 degrees to 35 degrees in each direction. |
| Scapulothoracic Joint? | Physiological joint between the scapula and thorax. |
| Glenohumeral joint? | Articulation between the head of the humerus and the glenoid fossa of the scapula. |
| Strength output of shoulder muscle movements from strongest to weakest. | Adduction, Extension, Flexion, Abduction, External Rotation, Internal Rotation. |
| What is the scapulohumeral rhythm? | Movement relationship between humerus and scapula during arm raising movements. |
| What are the muscles of the rotator cuff? | S.I.T.S. Supraspinatus, Infraspinatus, Teres Minor, Subscapularis. |
| Types of Shoulder Injuries? | Sprains, Strains, Fractures, Bursitis, Tendonitis, Impingement. |
| Sprain? | Rupture of fibers of ligament. |
| Subluxation? | Partial dislocation. |
| Fracture? | Break in bone, often clavicle. |
| Degeneration? | Deterioration of tissue. |
| Bursitis? | Inflammation of bursa. |
| Impingement Syndrome? | Irritation of structures above shoulder joint. Due to repeated compression between greater tuberosity and acromion process. |
| Subacromioal bursitis? | Common from impingement syndrome |
| Bicipital Tendonitis? | Inflammation of the tendon of the biceps brachii. |
| What are the injuries of the elbow and wrist? | Bennett's Fracture, Mallet Finger, Boutonniere deformity, Jersey finger, Trigger finger, tenosynovitis, carpal tunnel syndrome. |
| Bennett's Fracture? | Longitudinal fracture of base of first metacarpal(thumb). |
| Mallet Finger? | Avulsion of finger extensor tendons at distal phalanx. Result of forced flexion. |
| Boutonniere Deformity? | Stiff proximal interphalangeal articulation. Caused by injury to finger extensor mechanism. |
| Jersey Finger? | Avulsion of finger flexor. Result of forced hyperextension. Flexor tendon on palm side ruptures, can't flex. |
| Trigger Finger? | Snapping during flexion and extension of fingers. Created by nodules on tendons. |
| Tenosynovitis? | Inflammation of sheath surrounding tendon. |
| Carpal Tunnel Syndrome? | Pressure and constriction of median nerve. Caused by repetitive actions at wrist. Ex: Typing(need to keep elbow at 90degrees) |
| Carrying Angle? | Angle between ulna and humerus with elbow extended. 10-20 degrees. |
| Annular Ligament? | This ligament wraps around the head of the radius and attaches to the side of the ulna. This ligament holds the radius in the elbow joint while still allowing it to turn in pronation and supination. |