Disorders Of Hand And Wrist Flashcards
Why is the ulnar nerve not effected by carpal tunnel syndrome?
Passes through Guyon’s canal which is superficial to flexor retinaculum (superficial border to carpal tunnel)
Why is sensation to palm unaffected in carpal tunnel syndrome?
Palmar cutaneous branch of medial nerve which supplies section to radial 2/3rds of palm is given off proximal to carpal tunnel
Mechanism of injury of distal radius fractures
Fall onto outstretched hand
Who are distal radius fractures common in?
Young people with high energy trauma
Older people with low energy trauma
Risk factors for distal radius fractures
Osteoporosis
What does a distal radius fracture prompt investigation of?
Osteoporosis
Especially in older people with low energy trauma
What is a Colles’ fracture?
Extra articular distal radius fracture with dorsal angulation
Types of distal radius fractures
Colles’ fracture
Smith’s fracture
Mechanism of injury of Colles’ fracture
Fall onto outstretched hand
Wrist in flexed position
Management of Colles’ fracture
Reduction + immobilisation in case
Check pulses, sensations + movement
Complications of Colles’ fracture
Malunion - dinner fork deformity
Median nerve palsy + post traumatic CTS
Secondary osteoarthritis
Tear of extensor pollicis longus tendon
Typical shape of Colles’ fracture
Dinner fork deformity
Dinner - Dorsal
What is a Smith’s fracture?
Distal radius fracture with palmar angulation of distal fragment
Mechanism of injury of Smiths fracture
Fall onto dorsum of hand
Direct blow to back of wrist
Typical shape of Smith’s fracture
Garden space deformity
Complications of Smith’s fracture
Malunion narrows + distorts carpal tunnel > carpal tunnel syndrome
Mechanism of scaphoid fracture
Fall onto outstretched hand
What is the most common carpal bone fracture?
Scaphoid fracture
Presentation of scaphoid fracture
What makes it worse?
Pain in anatomical snuffbox
Worsens on moving wrist
What is the risk of a vascular necrosis of scaphoid fracture?
Dorsal carpal branch of radial artery supplies scaphoid
Management of fractures
Check pulses, sensation + movement
Analgesia
‘Reduce, hold + rehabilitate’
Closed reduction with immobilisation or percutaneous pinning
Open reduction internal fixation
External fixation
Types of closed reduction
Immobilisation
Percutaneous pinning
What joints does rheumatoid arthritis commonly affect in hands?
MCPJ
PIP
How does rheumatoid arthritis occur?
Autoimmune condition
1- autoantibodies attack synovial membrane
2- inflamed synovial cells proliferate > pannus
3- pannus penetrate through cartilage + adjacent bone
4- joint erosion + deformity
How does rheumatoid arthritis effect joins?
Symmetrical polyarthopathy - >1joint
Symptoms of rheumatoid arthritis in hands
Morning stiffness > 1 hour
Pain
Joint swelling + erythema of PIP + MCPJ
Extra-articular features
CTS - due to synovial swelling compression
What deformities are associated with rheumatoid arthritis?
Swan neck deformity
Boutonniere’s deformity
X ray changes of rheumatoid arthritis
LESS
Loss of joint space
Erosion of bone
Soft tissue swelling
See through bones - osteopenia
(Subluxation)
Describe swan neck deformity
Hyperextension of PIP
Flexion of DIP + MCPJ
Describe boutonniere’s deformity
Hyperextension of DIP + MCPJ
Flexion of PIP
What joint of hand is osteoarthritis most common in?
1st carpometacarpal joint
Symptoms of osteoarthritis in hand
Pain at base of thumb
Swelling around base at thumb
Morning stiffness < 1 hour
X ray changes in osteoarthritis
LOSS
Lss of joint space
Osteophytes
Subchondral cysts
Subchondral sclerosis
What is squaring of wrist due to?
What does it suggest?
Subluxation of 1st CMJ
Osteoarthritis of 1st CMJ
What joints do Herberden’s nodes effect?
DIPJ
What joints do Bouchard’s nodes effect?
PIPJ
What are heberden’s + bouchard’s nodes due to?
Osteophytes
What is psoriasis?
Skin condition that causes red, flaky patches of skin covered in silvery scales
Where does psoriasis generally occur?
Elbows
Knees
Scalp
Lower bacl
What joint does psoriatic arthritis most commonly affect?
DIPJ
Signs involve the nail so joint closest to nail
signs of psoriatic arthritis
Dactylitis
Nail pitting
Onchylosis
What is dactylitis?
Swelling of digit
What is onchylosis?
Nail pulling away form nail bed
What is Dupuytre’s contracture?
- Thickening of palmar aponeurosis
- Begins as a nodule/thickening in palm
- Skin becomes tethered due to myofibroblasts
- Fixed flexor deformity
Most common fingers effected by Dupuytren’s contracture
Ring + little
Risk factors of Dupuytren’s contracture
Type 1 diabetes
Smoking
Trauma to hand or fingers
Heart disease
What nerve in compressed in Guyon’s canal syndrome?
Ulnar nerve compression
Presentation of Guyon’s canal syndrome
Paraesthesia in ring and little finger due to ulnar nerve compression
Guyon’s canal syndrome causes weakness in what muscles?
Intrinsic muscles of hand supplied by ulnar nerve
ADductor pollicis
Palmar + dorsal interosseous
Lumbricals to little + ring finger
Deep head of flexor pollicis brevis
Causes of carpal tunnel syndrome
MEDIAN TRAP
Myxoedema
Edema prementrualy
Diabetes
Idiopathic
Acromegaly
Neoplasm
Trauma
Rheumatoid arthritis
Amyloidosis
Pregnancy
What are symptoms of carpal tunnel caused by?
Compression of median nerve
Symptoms of carpal tunnel syndrome
Loss of sensation in radial 3 1/2 digits
Sensation of palm intact
Weakness + atrophy to thenar muscles
Why is there weakness + atrophy of thenar muscles in carpal tunnel syndrome?
Motor branch of median nerve branches distal to carpal tunnel
What muscles experience weakness in carpal tunnel syndrome?
thenar muscles
ADductor pollicis brevis
Flexor pollicis brevis
Oppenens pollicis
First line treatment of carpal tunnel syndrome
NSAIDs
Analgesia
Second line treatment of carpal tunnel syndrome
Corticosteroid injections
Final treatment of carpal tunnel syndrome
Carpal tunnel release
Treatment of carpal tunnel syndrome
1st - NSAIDs + analgesia
2nd - corticosteroid injections
Last - carpal tunnel release
Test for carpal tunnel syndrome
Tunnel’s test + Phalen’s test
If + will produce CTS symptoms
What is Tinnel’s test?
Tapping over flexor reticulum
What is Phalen’s test?
Hyperflexion of wrist
Areas of growing bones in children
- epiphysis: rounded edge
- physis: growth plate - area of cartilage where growth occurs
- metaphysis: area between the physis and shaft
- diaphysis: shaft