Ortho by Dr Riwa Flashcards
Plexus Brachialis - Major Branches
- Musculocutaneus nerve ( C5, 6, 7) - M. Biceps brachii, brachialis,
- Axillary nerve (C5,6) M. deltoidius, regimental badge sign
- Median nerve (C5 -T1) - All flexors of the forearm except 1.5
- Radial nerve( C5-T1) - All extensors
- Ulnar nerve ( C8-T1) - 1.5 Flexors, all intrigate muscles of the hand
Median Nerve (C5-T1)- motor/sensory
- Motor
all flexors of the forarm except F.carpii ulnaris and half of F. digitotum proundus
Lateral two lumbriccals and thenar muscles except Adductor polices - Sensory:
supplies palmar aspect of the lateral 3.5 fingers
Median course
- *Anterior compartment of arm *
Anteromendial, **with brachial artery ** - *Forearm *
all flexors exept F carpii ulnaris and F digitorum profundus - *Hand *
through Carpal Tunnel
supplies lateral two lumbricals - *Terminal branches *
Anterior interosseous nerve
palmar cutaneus branch
recurrent branch - supplies thenar musles
Median Nerve Injury - Elbow (supracondylar fractur of the humerus)
Motor: All motor lost
Sensory: lost
Classical Sign: Hand of benediction( when pat makes a fist) and Thenar wasting
Symptoms worse with rotation (pronation) of forarm
Median Nerve Injury - Wrist
(Laceration, Carpal tunnel syndrom)
Motor: Lumbricalis and thenar lost - thenar wasting
Sensory: Similar to injury at elbow except no sensory loss over thenar muscle
Median nerve injury - test anterior interosseous nerve
- Ok-sign
Carpal tunnel syndrom - cause
- idiopatic -mc
- inflammatory - RA/OA
- posttraumatic
- pregnancy
- endocrine (Myxedema/Acromegaly)
- Gout
- repititive wrist movements
Carpal tunnel syndrom -symptomes
- Hand and wrist pain
- Paraesthesia
- Hyposthesia
- Patient wakes up at night with burning/aching, has to shake hand to restore sensation- CLASSICAL-IMPORTANT FOR EXAM
- Late signs- Thenar atrophy and weakness of thumb
Carpal tunnel syndrom - Examination
- Thenar wasting
- Phalens sign ( flexion of the wrist produces symptomes)
- Tinel sign ( tapping of the wrist produces tingeling)
- NCS - BEST TEST
Carpal tunnel syndrom - MX
First : splint/wrist bands
If not working: steroid infections
Best/final: Surgery to relase the flexor retinaculum
Radial nerve ( C5-T1) - Motor supply
Most commonly injured nerve
best prognosis post injury.
Motor:
- Axilla : long head of triceps (first elbow extensor)
- Spiral groove : lateral and medial head of triceps, Anconeus
- After piercing the intermuscular septum : Extensor carpi radialis (first wrist extensor)
- divides into-Posterior interosseous nerve (major motor nerve) which extends thumb & fingers and a superficial branch
Radial nerve ( C5-T1) - Sensory supply
Radial nerve injury - Axilla
- Saturday night palsy/ crutch palsy
- all sensory & motor function loss
- Wrist drop classical seen
Radial nerve injury - Radial groove
- Fracture of the humerus
MOTOR
* Triceps retained
* Extension of fingers and wrist lost ( Wrist drop)
SENSORY
* Arm and forearm retained
* sensation lost on dorsal lateral 3.5 fingers
Radial nerve injury -forearm superficial branch
- Laceration/stabbing
MOTOR - none
SENSORY - sensation lost on dorsal lateral 3.5 fingers
Radial nerve injury - forearm deep branch
- Fracture of the radial headm posterior dislocation of the radius
MOTOR - Majority of thr muscles in posterior forarm efected
** NO wrist drop **- Extensor carpi radialis not effected Posterior interosseous nerve
SENSORY
* none
Ulnar nerve injury - Compression Pisohammat ligament (eg cyst)
- loss of sensation over fingers and hypothenar muscle wasting.
- Sensations over hypothenar eminence are spared
Ulnar nerve ( C8-T1)- Sensory Supply
PATTERNS OF SENSORY LOSS
Mononeuropathies
localised sensory disturbance in the area supplied by the damaged nerve
Peripheral neuropathy
symmetrical sensory deficits in a ‘glove and stocking’ distribution in the peripheral limbs, m/c diabetes mellitus & chronic alcohol excess.
Radiculopathy
due to nerve root damage (e.g. compression by a herniated intervertebral disc), -sensory disturbancesin the associated dermatomes.
Spinal cord damage
sensory loss both at and below the level of involvement in a dermatomal pattern
Thalamic lesions (e.g. stroke)
contralateral sensory loss
Myopathies
symmetrical proximal muscle weakness
Nerve injury - Clavicular
Brachial Plexus - Subclavian artery
Nerve injury - anterior GH dislocation
N.axillaris
Nerve injury - Surgical neck of humerus
N.axillaris
Nerve injury - Midshaft humerus
N.radialis
Nerve injury - Clavicular
Nerve injury - medial epicondyle
N.ulnaris
Nerve injury - greater tuberosity of the humerus
N.axillaris
Nerve injury - Supracondylar humerus
Median nerve - brachial artery
Nerve injury - Coles
N.median
Nerve injury - ERB
Brachial plexus – high: C5 – C6
Nerve injury - Klumpke
Brachial plexus – low: C8 – T1
Biceps reflex
C5/6
Supinator -Brachioradialis reflex
C5/6
Triceps reflex
C7
Injury Ulnar - at wrist
Sensory
* numbness in the little and ring fingers
Motor
* weakness of abduction of his little finger
* weakness of flexion of the terminal
phalanx of his little and ring fingers
Lumbar Plexus
- formed by anterior rami L1-L4 and contributions of T12
- Important Obturator and Femoral nerve
Obdurator nerve (L2-4)
- innervates muscles of the medial thigh
- obturator externus, adductor longus,
adductor brevis, adductor magnus and gracilis
Femoral nerve (L2-L4)
- innervates muscles of the anterior thigh
- the illiacus, pectineus, sartorius and quadriceps femoris
Sacral plexus
- anterior rami S1-S4 and L4-5
- Important Sciatic nerve
Sciatic nerve (L4,5, S1-3)
**Tibial portion **
* muscles in the posterior compartment of the
thigh (apart from the short head of the biceps femoris)
* hamstringcomponent of adductor magnus
* muscles in the posterior compartment of the leg and sole of the foot
Common fibular portion
* Short head of biceps femoris, all muscles in the
anterior and lateral compartments of the leg and extensor digitorum brevis
* Motor fn- dorsiflexion and eversion
Myotomes - upper limb
C4 = shoulder shrugs
C5 = Shoulder abduction and elbow flexion
C6 = Wrist extension
C7 = Elbow extension and wrist flexion
C8 = Thumb extension and fingers flexion
T1 = Finger abduction
Myotomes - lower limb
L2 = Hip flexion
L3 = Knee extension
L4 = ankle dorsiflexion
L5 = Big toe extension
S1 = Ankle plantar flexion
S4 = Bladder and rectum motor supply
Complication of fractures and fracture healing
- Osteomyelitis
- Haemorrhage – Mostly seen with pelvic fractures
- Vascular/Nerve injuries- Popliteal artery / common peroneal nerve
- Avascular Necrosis- NOF fractures/ scaphoid/ talus
- Malunion / Nonunion
- Compartment Syndrome
Compartment Syndrome
- Emergency
- High risk : fractures of elbow/forearm/proximal third of tibia/multiple fractures of hand or foot/ crush injuries / circumferential burns / tight plasters/ infection/ post surgery
- > 6h - severe irreversible myonecrosis - Volkmans ischemic contracture
Compartment Syndrome - Clinic
Pain out of proportion with injury
Paresthesia
Pallor ( may last symptom with Pulselessness)
Paralysis
Pulselessness
Compartment Syndrom - RX
- SIGN- passive stretch test
if toes/fingers are passively stretched it results in pain in calf or forearm - Confirmation- Measuring the inter compartmental pressure
- clinical diagnosis
Compartment Syndrom - Mx
- Fasciotomy
Clavicle Fracture
- Fall onto affected shoulder
- Pat is supporting arm which is in full adduction
Clavicle Fracture - Thinks to look for
- Careful NEUROVASCULAR examination
- skin integrity to r/o open fracture
- lung fields to r/o apical lung injury
Clavicle Fracture - Classification
- middle third
- lateral third
- medial third
Clavicle Fracture - Middle third
- 80%
- Defined by shortening/comminution/angulation
MX
* Broad arm sling to support limb for 2 weeks or untilcomfortable.Regular analgesia as required
Clavicle Fracture -Lateral third
- 15%
- Around and lateral to
coracoclavicular Ligaments
Mx
* If undisplaced,no reduction required
* If displaced,refer
* Broad arm sling to support limb for 2 weeks or until
comfortable
Regular analgesia as required
Clavicle Fracture -medial third
- 5%
- Bony injury alone associated with sternoclavicular
dislocation- look for vascular,injury/neurological injury
Mx
* If Undisplaced,no reduction required
* ** If displaced,urgent referral**
* Broad arm sling to support limb
Clavicle Fracture -medial third
Brachial plexus injury
Subclavian vessel injury
Shortening of the shoulder arc
Stiffness of the shoulder joint
Cosmetic side effects
Shoulder disslocation - Types
- Anterior- m/c
- Posterior- seen in seizures or electric shock
- Inferior dislocation (luxatio erecta)
- Superior dislocation
Shoulder dislocation - Anterior Clinic
- most common of trauma indirect & direct
Clinic
* injured shoulder in slight abduction and
external rotation, SUPPORTED by the normal side
* Presents with pain/ discomfort and inability to move the affected shoulder.
* ALWAYS do a careful neurovascular examination (axillary nerve)
Shoulder dislocation - Anterior RX/Mx
Rx
* Xray AP
* CT/MRI post reduction
Mx
* reduction in trauma bay under anaestesia
Fracture proximal humerus - Pathopysiology
- common in elderly (osteoporosis) - outstreched arm (low energy)
- High energy - risk of soft tissue and neurovascular complications
- Nerve - axillaris injury M/C
- Aterial - uncommon, higher risk in elderly x