Upper limb problems II Flashcards
Elbow joint is a type of
Hinge type synovial joint
Articulations of the elbow joint
Trochlear notch of ulna + trochlea of humerus
Head of radius + capitulum of humerus
All synovial joints have
Outer fibrous joint capsule
Describe the joint capsule of elbow joint
Joint capsule thickened medially and laterally to form collateral ligaments
What are the ligaments of the elbow
Lateral collateral ligament (radial ligament)
Annular ligament
Medial ligament (ulnar ligament)
The lateral collateral ligament originates from
Lateral epicondyle of humerus
The medial ligament originates from
Medial epicondyle of humerus
Name A-D
A- radial collateral ligament (lateral collateral)
B - Annulus ligament
C - Joint capsule
D - Ulnar collateral ligament (medial collateral)
What are the bursae of the elbow
Intratendinous bursa
Subtendinous bursa
Subcutaneous (olecranon) bursa
Name A - C
A - Subtendinous bursa
B - Intratendinous bursa
C - Olecranon bursa (subcutaneous)
What happens to the radius and ulna during pronation
Radius moves over ulna
What is lateral epicondylitis (tennis elbow)
condition that causes pain around the outside of the elbow
Cause of lateral epicondylitis
Repetitive extension of wrist causing strain and injury
Degenerative tendonitis of the extensor tendon originating on lateral epicondyle
What are the forearm muscles for extension of the wrist
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
The extensors of the wrist all originate from (common extensor origin)
Lateral epicondyle of humerus
What is the pathology in lateral epicondylitis
Micro-tears in the common extensor origin (lateral epicondyle)
Symptoms of lateral epicondylitis
pain and tenderness over the lateral epicondyle
pain on opening a jar
Clinical signs of lateral epicondylitis
pain on resisted middle finger and wrist extension
Management for lateral epicondylitis
rest
physiotherapy
NSAIDs
steroid injections
Elbow clasp (brace)
Surgery in recurrent cases
What is medial epicondylitis (golfer’s elbow)
a consequence of repeated strain or degeneration of the common flexor tendon (common flexor tendonitis)
What are the muscles that origin from the medial epicondyle
Palmar longus
Pronator teres
Flexor carpi radialis
Flexor carpi ulnaris
Flexor digitorum superficialis
Which type of epicondylitis is more common
Lateral epicondylitis
Symptoms of medial epicondylitis
Pain and tenderness on medial epicondyle
Pain opening a jar
Clinical signs of medial epicondylitis
- Flex elbow to 90° in supination
- pain produced when wrist flexed against resistance
Management of medial epicondylitis
physiotherapy
rest
NSAIDs
Why is intra-articular steroids not used in medial epicondylitis
Due to risk of damage to ulnar nerve
Which type of arthritis is common in elbow
RA
Primary / secondary OA is more common in elbow
Secondary OA is more common in elbow
What is cubital tunnel syndrome
compression of the ulnar nerve at the elbow behind the medial epicondyle
Name A-D
A - Medial epicondyle
B - Retinaculum
C - Olecranon
D - ulnar nerve
Causes of cubital tunnel syndrome
tight band of Osborne’s fascia (cubital retinaculum)
tightness at the intermuscular septum
Tightness between the 2 heads of flexor carpi ulnas
Symptoms of cubital tunnel syndrome
paraesthesiae in the ulnar 1½ finger
Night symptoms - caused by sleeping with the arm in flexion
Clinical signs of cubital syndrome
Tinel’s test over the cubital tunnel - usually positive
Weakness of ulnar nerve innervated muscles 1st dorsal interosseous, abduction index finger and adductor pollicis
Investigations for ulnar nerve injury
Froment’s test
Tinel’s test
What is froment’s test what does it test for
Tests for adductor pollicis function which would show ulnar nerve injury
thumb flexes at the IP joint while pinching a piece of paper to compensate for a weak adductor pollicis muscle
Management of Cubital syndrome
NSAIDs,
activity modification
nighttime elbow extension splinting
Surgery if refractory
Injury mechanism of olecranon fracture
Falling onto elbow
Symptoms of olecranon fracture
Pain localised to posterior elbow
Clinical signs of olecranon fracture
Inability to extend elbow
Palpable defect indicating displaced fracture
What does inability to extend elbow suggest in olecranon fracture
Triceps brachii function is compromised - since olecranon is triceps brachii insertion point
Investigations for olecranon fracture
- X-ray - AP and lateral
- CT
Management for olecranon fracture
ORIF for comminuted fracture
Tension band (conservative if transverse fracture)
Most common type of elbow dislocation
Posterior
Mechanism of injury of elbow dislocation
Fall on outstretched hand
Types of elbow dislocation
Posterior
Anterior
Lateral
Medial
Divergent
Investigations for elbow dislocation
Xray - AP and lateral
Management for uncomplicated elbow dislocation
closed reduction under sedation
short period in sling (1‐3 weeks)
How long should patients be in a sling for elbow dislocation
1-3 weeks
What complications may occur in elbow dislocation
Fracture of radial head, humeral epicondyles or coronoid process of the ulna
Causing bony fragments to be entrapped and limit motion
Management for elbow dislocation with associated fracture
ORIF +/- screws
What is a supracondylar fracture
Fracture at distal humerus right above the condyles
Injury mechanism of supracondylar fracture
Fall on outstretched hand
Supracondylar fracture is most commonly seen in
Children
Which neurovascular structures are likely to be damaged in supracondylar fractures
Brachial artery
Median nerve
Signs of supracondylar fracture
Refusal to move elbow
unable to make the “OK” sign
Why would a patient with supracondylar fracture be unable to make the OK sign
Due to anterior interosseous branch of median nerve damage
- loss of flexor pollicis longus and flexor digitorum profundus (lateral 2)
Function of flexor pollicis longus
flexes the IP joint and MCP joint of the thumb
Innervation of flexor pollicis longus
Anterior interosseous branch of median nerve
Function of flexor digitorum profundus
the only muscle that can flex the DIP of the finger (except thumb)
assist flexion of wrist
assist flexion of MCP
Innervation of flexor digitorum profundus
Index + middle finger - anterior interosseous branch of median nerve
Little + ring finger - ulnar nerve
Investigations for supracondylar fracture
Xray - AP and lateral
What may be seen on xray for supracondylar fracture
Posterior fat pad sign
Management of undisplayed supracondylar fracture
Splint
Management of displaced supracondylar fracture
Closed reduction + pinning with wires
Open reduction if cannot perform closed reduction
Surgery if indicated