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
When is surgery indicated in supracondylar fracture
If radial pulse cannot be felt
If there is nerve injury (cannot make OK sign)
Function of anterior compartment of the forearm
Flexion at wrist
Flexion at fingers
Pronation
which muscles of the anterior compartment of the forearm is not supplied by the median nerve? and which nerve innervates these muscles
Flexor carpi ulnas
Medial part of flexor digitorum profundus
Ulnar nerve
What are the superficial muscles in the anterior forearm
Flexor carpi ulnaris
Palmaris longus
Flexor carpi radialis
Pronator teres
Name A-I
A - Biceps Brachii
B - Brachialis
C - Brachioradialis
D - Triceps brachii
E - Pronator teres
F - Flexor carpi radialis
G - Palmaris longus
H - Flexor carpi ulnaris
I - flexor digitorum superficialis
All superficial muscles of the anterior forearm attach proximally by ___ to ____
Attach proximally by common flexor tendon to medial epicondyle of the humerus
Medial epicondyle = common flexor origin
Attachment point for palmaris longus
Origin: medial epicondyle
Attachment: Palmar aponeurosis
Function of palmaris longus
Flexion at the wrist
Is palmaris longus present in all population
No, absent in 15%
Attachment point for pronator teres
Origin: medial epicondyle and coronoid process of ulna
Attachment: Mid-shaft of the radius
Function of pronator teres
Pronation of the forearm
What are the wrist flexor muscles
Palmaris longus
Flexor carpi radialis
Flexor carpi ulnaris
Attachment point for flexor carpi radialis
Origin: Medial epicondyle
Attachment: Base of 2nd and 3rd metacarpals (metacarpals on the radial side)
Function of flexor carpi radialis
Flexion and ABDUCTION at the wrist
Attachment of flexor carpi ulnaris
origin: medial epicondyle and olecranon of ulna
Attachment: pisiform carpal bone
Function of flexor carpi ulnaris
Flexion and ADDUCTION at the wrist
What muscle is part of the intermediate compartment of anterior forearm
Flexor digitorum superficialis
Name A-G
A - pronator teres
B - Flexor digitorum superficialis
C - palmaris longus
D - Flexor carpi radialis
E - flexor carpi ulnaris
F - Flexor retinaculum
G - palmar aponeurosis
Attachment point for flexor digitorum superficialis
Origin: Medial epicondyle and coronoid process of ulna and shaft of radius
Attachment: splits into 4 tendons at the wrist and attach to MIDDLE phalanges of the 4 digits except thumb
Innervation of flexor digitorum superficialis
Median nerve
Function of flexor digitorum superficialis
Flexion of the MCP and PIP joints at the 4 fingers
Flexion of the wrist
What are the muscles of the deep compartment of anterior forearm
Flexor digitorum profundus
Flexor pollicis longus
Pronator quadratus
Difference between origins of deep muscles and superficial muscles of the anterior forearm
Superficial muscles (including flexor digitorum superficialis) all originate from the medial epicondyle (common flexor origin) whereas the deep muscles do not
Attachment of flexor digitorum profundus
Origin: Ulna and its interosseous membrane
Attachment: Splits into 4 tendons at the wrist and attach to DISTAL phalanges of the 4 fingers except thumb
Function of flexor digitorum profundus
the ONLY muscle that can flex the DIP joints of the 4 fingers
assist Flexion of MCP of the 4 fingers
assist Flexion at wrist
Innervation of flexor digitorum profundus
Medial half = little and ring fingers = Ulnar nerve
Lateral half = Middle and index fingers = anterior interosseous branch of median nerve
Attachment of flexor pollicis longus
Origin: anterior surface of the radius and interosseous membrane
Attachment: Base of distal phalanx of the thumb
Function of flexor pollicis longus
flexes the IP and MCP of thumb
Innervation of flexor pollicis longus
Anterior interosseous branch of median nerve
Attachment of pronator quadratus
Origin: Anterior surface of the ulna
Attachment: Anterior surface of the radius
Innervation of pronator quadratus
Anterior interosseous branch of median nerve
Function of pronator quadratus
Pronates the forearm
Name A -C
A - Flexor pollicis longus
B - Pronator quadratus
C - Flexor digitorum profundus
Both flexor digitorum superficialis and profundus split in to 4 tendons at the wrist then
Passes through the carpal tunnel to attach to the phalanges of digits
Name A-I
A - Flexor digitorum superficialis
B - Flexor digitorum profundus
C - palmar carpal ligament
D - flexor retinaculum
E - flexor digitorum superficialis
F - Flexor digitorum profundus
G - flexor pollicis longus
H - Pronator quadratus
I - palmaris longus tendon
Attachment of flexor retinaculum
On the ulnar side - pisiform and hamate bone
On the radial side - scaphoid and trapezium bone
Main function of posterior compartment of forearm
Extension at wrist and fingers
Arterial supply of posterior compartment of the forearm
Posterior interosseous artery - branch of ulnar artery
The muscles of the posterior compartment of the forearm are all innervated by
Radial nerve
Where is the common origin of the superficial posterior forearm muscles
Common extensor tendon on the lateral epicondyle of humerus
What are the superficial posterior forearm muscles
Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum
Extensor digiti minimi
Extensor carpi ulnaris
Anconeus
Name A - G
A - anconeus
B - flexor carpi ulnaris (anterior)
C - Extensor digiti minimi
D - Extensor carpi ulnaris
E - Extensor carpi radialis longus
F - Extensor carpi radialis brevis
G - Extensor digitorum
Attachment of brachioradialis
Origin: supracondylar ridge of humerus
Attachment: Lateral surface of distal end of radius
Function of brachioradialis
Flexion of semi-pronated forearm e.g. when drinking from a cup
Attachment of extensor carpi radialis longus
Origin: lateral supracondylar ridge
Attachment: joins with the tendon of ECRB to attach to dorsal aspect of base of 2nd metacarpal
Attachment of extensor carpi radialis brevis
Origin: Lateral epicondyle
Attachment: joins with the tendon of ECRL to attach to dorsal aspect of base of 3rd metacarpal
Function of ECRL
Extension of the wrist
Abducts the hand at wrist
Function of ECRB
Extension of wrist
Abducts the hand at wrist
Innervation of ECRL
Radial nerve
Innervation of ECRB
Deep branch of radial nerve
Attachment of extensor digitorum
Origin: Lateral epicondyle
Attachment: Splits into 4 tendons and insert into the extensor hood of the 4 fingers
Function of extensor digitorum
Extension of medial 4 digits at DIP, PIP and MCP joints
Innervation of extensor digitorum
Deep branch of radial nerve
Attachment of extensor digiti minimi
Origin: Lateral epicondyle
Attachment: joints with the extensor digitorum tendon and insert into extensor hood of little finger
Function of extensor digiti minimi
Extend the little finger at MCP DIP PIP joints
Attachment of extensor carpi ulnaris
Origin: Lateral epicondyle
Attachment: dorsal aspect of Base of 5th metacarpal
Function of extensor carpi ulnaris
Extension of hand at wrist joint
Adduction of hand at wrist joint
What are the deep muscles of posterior forearm
Supinator
Extensor indicis
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Function of supinator muscle
Supinates the forearm
Innervation of supinator muscle
Deep branch of radial nerve
Attachment of extensor indices
Origin: Posterior surface of distal 1/3 of ulna and interosseous membrane
Attachment: Extensor hood of 2nd digit
Function of extensor indices
Extends the index finger
Innervation of extensor indices
Posterior interosseous branch of radial nerve
Attachment of abductor pollicis longus
Origin: Posterior surface of ulna and interosseous membrane
Attachment: dorsal aspect of base of 1st metacarpal
Function of abductor pollicis longus
Abducts the thumb
Extends the thumb at carpometacarpal joint (base of thumb)
Innervation of abductor pollicis longus
Posterior interosseous branch of radial nerve
Attachment of extensor pollicis brevis
origin: Posterior surface of distal 1/3 of radius and interosseous membrane
Attachment: Dorsal aspect of base of proximal phalanx of thumb
Function of extensor pollicis brevis
Extends the thumb at MCP and CMC joints
Innervation of extensor pollicis brevis
Posterior interosseous branch of radial nerve
Attachment of extensor pollicis longus
Origin: Posterior surface of middle 1/3 of ulna and interosseous membrane
Attachment: Dorsal aspect of base of distal phalynx of thumb
Function of extensor pollicis longus
Extend the thumb at CMC, MCP, IP joints (all joints of thumb)
Muscle bellies of which muscle of the posterior compartment of the forearm can be found at the anterior compartment
Supinator
Brachioradialis
Name A-E
A- supinator
B- Abductor pollicis longus
C- extensor pollicis brevis
D- extensor pollicis longus
E- Extensor indicis
Name A-J
A- Brachioradialis
B- Extensor carpi radialis longus
C- Extensor carpi radialis brevis
D- Anconeus
E- Extensor digitorum
F- Extensor digiti minimi
G- Extensor carpi ulnaris
H- Abductor pollicis longus
J- Extensor pollicis brevis
I- Extensor retinaculum
Carpal tunnel is formed by
Flexor retinaculum - anterior
Carpal bones - posterior
Contents of the carpal tunnel
4x tendons of flexor digitorum superficialis
4x tendons of flexor digitorum profundus
1x tendon of flexor pollicis longus
Name A-E
A- flexor retinaculum
B- Flexor digitorum superficialis
C- Flexor digitorum profundus
D- Flexor pollicis longus
E- Median nerve
Radius and ulna are connected by
Proximal and distal radioulnar joints
Because radius and ulna are connected by 2 joints they form a
ring
The ring structure of radius and ulna means that
If there is a fracture of one bone, there is usually an injury of the other
Patterns of radius and ulna shaft fractures
Monteggia
Galeazzi
Nightstick fracture
Describe Monteggia pattern of radius and ulna shaft fracture
Fracture of proximal 1/3 of ulna + dislocation of proximal head of radius
Describe Galeazzi pattern of radius and ulna shaft fracture
Fracture of distal 1/3 of radius + dislocation of distal radioulnar joint
Describe nightstick fracture
Isolated fracture of the ulnar shaft
Clinical signs of radius and ulna shaft fracture
Deformity
Change in neurovascular function (radial, ulnar, median nerves; radial and ulnar arteries)
Investigations for radius and ulna shaft fracture
Xray - AP and lateral
Management for radius and ulna shaft fracture
Cast
ORIF
Mechanism of injury for distal radius fracture
Fall on outstretched hand
Patterns of distal radius fractures
Colles
Smith
Barton’s
Describe Colles fracture
Fracture of distal radius with posterior displacement of distal fragment
Describe Smith’s fracture
Fracture of distal radius with anterior displacement of distal fragment
Describe Barton’s fracture
Intra-articular fracture of the distal radius with dislocation of the radiocarpal joint
Symptoms of distal radius fracture
Wrist pain
Wrist swelling
Deformity
Investigations of distal radius fracture
Xray- AP, lateral, oblique
CT - to evaluate intra-articular involvement
MRI - to evaluate soft tissue injury
Management of distal radius fracture
Cast
ORIF
Manipulation under anaesthetics + K wires
Complication of distal radius fracture
Carpal tunnel syndrome - esp Colles
Heal in poor position -> impaired grip strength