8 Elbow & Wrist Flashcards
What are the joints of the elbow?
- ulnohumeral
- radiohumeral
- proximal radioulnar (pivot joint)
How many joint capsules are in the elbow?
One continuous joint capsule surrounds all three joints
What are the ligaments of the elbow?
- Medial (ulnar) collateral ligament supports the medial aspect of the elbow
- Lateral (radial) collateral ligament supports the lateral elbow
- Annular ligament in circles and supports the head of the radius in the radial notch of the ulna and allows for a pivoting movement at the joint
What are the available ROMs of the elbow joint?
- Flexion: 140 to 150°
- Extension: 0 to 10°
- Supination: 90° (tissue stretch end feel)
- Pronation: 80 to 90° (tissue stretch end feel)
What nerves supply the muscles of the elbow? Which muscles?
- Musculocutaneous supplies biceps brachii and brachialis (rarely becomes entrapped or injured)
- The radial nerve supplies the elbow extensors as well as the wrist extensors (it crosses the elbow and is susceptible to injury here)
- The median and ulnar nerves innervate the muscle of the anterior forearm (They cross the elbow and are, therefore, susceptible to injury here as well)
What is the AKA for lateral epicondylitis?
Tennis elbow
What are the two methods for testing for lateral epicondylitis?
- (aka tennis elbow test aka Cozen’s test [akas not testable]) – the patient’s elbow is stabilized by the examiner’s thumb which rests on the patient’s lateral epicondyle. The patient is asked to make a fist, pronate the forearm, and radially deviate and extends the wrist while the examiner resists the motion. A sudden severe pain in the area of the lateral epicondyle of the humerus is a positive sign.
- (aka tennis elbow test aka Mill’s test [akas not testable]) – while palpating the lateral epicondyle, the examiner passively pronates the patient’s forearm, flexes the wrist fully, and extends the elbow. Pain over the lateral epicondyle of the humerus indicates a positive sign.
What factors contribute to the development of RSIs?
- Weak muscles (load gets transferred to the musculotendinous junction)
- Joint laxity (If the joint is unstable the muscles have to work harder to stabilize it)
- Rapid/excessive repeated eccentric loading of the muscles
- Sudden increase in unusual activities.
- Return to activity too soon following injury
- Sustained faulty posture/workstation ergonomics
Which tendon is affected with lateral epicondylitis?
Tendinopathy of the common extensor tendon
What is the aka for medial epicondylitis?
Golfer’s elbow
What is medial epicondylitis?
Tendinopathy of the common flexor tendon/pronator tendon
What neuropathy is an often associated with tendinopathy of the common flexor tendon?
ulnar neuropathy (ulnar nerve is close to CFT)
What are common impairments/functional limitations with elbow RSIs?
- Gradually increasing pain in the elbow region after excessive wrist activities
- Decreased muscle strength and endurance
- Decreased grip strength limited by pain
- Tenderness with palpation at the site of inflammation
- Inability to participate in provoking activities such as racquet sports, throwing, assembling small parts, typing on the keyboard or using a mouse, gripping activities, turn screwdriver, playing a percussion instrument
How many bones, intrinsic and extrinsic muscles are there in the hand customer
- 28 bones
- 19 intrinsic muscles
- 20 extrinsic muscles
Which carpal bones does the radius directly articulate with?
Scaphoid and lunate
Which nerve can easily become compressed within the Tunnel of Guyon?
ulnar nerve
Which digits are included in the median nerve distribution?
Lateral three and a half digits
What composes the roof and floor of the carpal tunnel?
- Roof: carpal bones
- Floor: flexor retinaculum
What structures travele through the carpal tunnel?
- The median nerve
- The four tendons of flexor digitorum superficialis
- The four tendons of flexor digitorum profundus
- The tendon of flexor pollicis longus
What are some causes of carpal tunnel syndrome?
- Repetitive wrist movements (primarily flexion/extension) leading to edema, fibrosis and thickening of the tendons (RSI scenario)
- Thickening of the retinaculum
- System conditions that resulted in edema, fluid retention, or connective tissue degeneration such as diabetes, RA, pregnancy
- Bony callus formation after carpal bone or distal radius fracture
- Bony changes that occur with arthritis
- Acute RA flare ups