Brachial Plexus Injury
Upper LimbOverview
Brachial plexus injury involves damage to the nerve network (C5-T1) that controls upper limb function, resulting from trauma, stretching, or compression. Injuries range from mild neurapraxia to complete nerve root avulsion, presenting with varying degrees of motor weakness, sensory loss, and pain. Prognosis depends on injury severity, mechanism, and timing of intervention.
Pathophysiology
The brachial plexus can be damaged through traction injuries (shoulder depression with neck extension), compression injuries (cervical rib, scalene muscle hypertrophy, fibrous bands), penetrating trauma, or nerve root avulsion from the spinal cord. Nerve injury triggers inflammatory cascades, axonal degeneration, and disruption of motor and sensory signals. In traction injuries, nerve fibers may be stretched beyond their elastic limit, causing demyelination (neurapraxia) or axonal disruption (axonotmesis), or complete nerve root avulsion (neurotmesis). Chronic cases may develop neurogenic inflammation, muscle atrophy, and complex regional pain syndrome.
Patient Education
Brachial plexus injuries require prompt assessment and specialist neurological evaluation; early intervention, gentle mobilisation, and structured rehabilitation maximise recovery and prevent secondary complications like muscle contracture and chronic pain.
Typical Presentation
Site
Upper limb including shoulder, arm, forearm, hand; pain may radiate from neck to fingers; distribution depends on which nerve roots are involved
Quality
Sharp, burning, shooting, or electric pain; numbness and tingling; heaviness or weakness sensation
Intensity
Highly variable (0-10/10) depending on injury severity; acute injuries often severe; chronic injuries may present with dull ache
Aggravating
Neck movement away from injury side, shoulder depression, arm elevation, certain work activities, sustained postures, Adson's test position (neck extension with arm abduction)
Relieving
Arm support in sling, neck lateral flexion toward injury, rest, ice in acute phase, gentle arm movements
Associated
Motor weakness (variable by nerve root: C5 shoulder abduction/external rotation, C6 elbow flexion, C7 elbow extension, C8-T1 hand grip), sensory loss in dermatomal pattern, swelling, muscle atrophy (develops over weeks), colour changes, temperature changes, Horner's syndrome if T1 root involved, hand weakness and clumsiness
Orthopaedic Tests
Upper Limb Tension Test (ULTT) / Nerve Stretch Test
Procedure
Patient supine; sequentially abduct the shoulder to 90°, externally rotate, extend the elbow, and dorsiflex the wrist while the examiner stabilizes the scapula. Sensitizing maneuvers include cervical contralateral side-bending.
Positive Finding
Reproduction of radicular pain, paraesthesia, or neural symptoms in the distribution of the affected nerve root(s); comparison with the unaffected limb.
Sensitivity / Specificity
Reference: Wainner RS et al., Spine 2003; PMID 12544957
Interpretation
Suggests neural tension or nerve root involvement; high sensitivity for detecting brachial plexus irritation, though not specific to plexus injury alone. Useful for differential diagnosis of cervical root pathology. Note: these figures derive from cervical radiculopathy populations (Wainner 2003); not validated specifically for brachial plexus injury.
Spurling's Test (Cervical Compression & Extension)
Procedure
Patient seated; examiner applies gentle downward compression on the head while the cervical spine is extended and rotated toward the affected side. Hold for 30 seconds.
Positive Finding
Immediate sharp radicular pain radiating into the upper limb corresponding to the nerve root distribution.
Sensitivity / Specificity
Reference: Wainner RS et al., Spine 2003; PMID 12544957
Interpretation
High specificity for cervical nerve root compression (C5–C6 most common); positive result strongly suggests nerve root involvement as a source of brachial plexus symptoms. Helps differentiate root-level pathology. Note: these figures derive from cervical radiculopathy populations (Wainner 2003); not validated specifically for brachial plexus injury.
Adson's Test (Thoracic Outlet Syndrome / TOS Screen)
Procedure
Patient seated or supine; shoulder abducted 90° and externally rotated; patient extends neck and rotates head toward the affected side while taking a deep breath. Examiner monitors radial pulse.
Positive Finding
Disappearance or significant diminution of the radial pulse on the affected side; reproduction of paraesthesia, pain, or heaviness in the arm.
Sensitivity / Specificity
Reference: Gillard J et al., Joint Bone Spine 2001; PMID 11707008
Interpretation
Suggests vascular or neural compression at the thoracic outlet; useful for screening TOS as a differential diagnosis or contributing factor in brachial plexus symptoms, though low–moderate sensitivity limits its stand-alone diagnostic value.
Tinel's Sign at the Brachial Plexus
Procedure
Examiner percusses gently along the course of the brachial plexus, particularly in the supraclavicular fossa and axilla, using a small reflex hammer.
Positive Finding
Sudden 'tingling' or 'pins and needles' sensation radiating distally into the forearm and hand in the distribution of the plexus.
Interpretation
May indicate nerve regeneration or irritation at a specific point along the plexus; low sensitivity but helpful if present. Absence does not rule out plexus injury.
Phrenic Nerve Involvement Screen (Shoulder Abduction Test)
Procedure
Patient supine; examiner assesses diaphragmatic motion using fluoroscopy or ultrasound while patient performs deep inspiration, or observes for asymmetrical chest wall movement and abdominal breathing patterns.
Positive Finding
Ipsilateral elevated hemidiaphragm, reduced diaphragmatic excursion (fluoroscopy <1 cm), or paradoxical breathing patterns; C3–C4–C5 root involvement.
Related reference: Ferrante MA, Muscle Nerve 2004; PMID 15452843
Interpretation
Indicates proximal brachial plexus injury (upper trunk/root level); helps localize injury to C3–C5 and assess severity. Important for respiratory assessment in high plexus lesions.
⚠ Red Flags
- •Acute severe trauma with sudden complete arm paralysis requiring emergency referral
- •Signs of Horner's syndrome including ptosis, miosis, and anhidrosis suggesting T1 avulsion with poor prognosis
- •Severe progressive neurological deficit or rapidly worsening weakness
- •Penetrating wound with visible nerve damage
- •Fracture-dislocation of cervical spine or shoulder girdle
- •Severe vascular compromise including cold limb, absent pulses, or severe swelling
⚡ Yellow Flags
- •Significant psychological distress or catastrophising about permanent disability
- •Fear of using affected limb leading to learned non-use and muscle atrophy
- •Concurrent substance abuse potentially affecting compliance with rehabilitation
- •High comorbidity of depression, anxiety, or chronic pain syndrome
- •Unrealistic expectations regarding recovery timeline
- •Poor motivation for rehabilitation exercises
- •Occupational demands incompatible with injury severity
- •Litigation or compensation claims that may perpetuate symptom focus
Osteopathic Techniques
Region
Cervical spine and nerve roots C5-T1
Technique
Rationale
Gentle soft tissue techniques to scalene muscles, levator scapulae, and upper trapezius reduce muscle guarding and improve neural mobility without compromising healing; reduces secondary entrapment at cervical level
Region
Cervical and upper thoracic spine
Technique
Rationale
Gentle cervical articulation and mobilisation improves intervertebral foraminal opening, reduces nerve root compression, and enhances drainage; careful grading essential during acute phase
Region
Scalene triangle and thoracic inlet
Technique
Rationale
Functional technique to normalize scalene muscle tone and thoracic inlet mechanics reduces compression of upper brachial plexus; particularly effective for neurogenic thoracic outlet syndrome component
Region
Upper limb including shoulder girdle and arm
Technique
Rationale
Muscle energy technique improves shoulder girdle stability and reduces protective muscle tension; proprioceptive feedback supports neural re-education and prevents immobility-related stiffness
Region
Brachial plexus pathway and surrounding tissues
Technique
Rationale
Gentle lymphatic drainage techniques reduce post-traumatic swelling and inflammation; improves local circulation to support nerve healing and reduces chemically-mediated pain
Region
Cranial base and cervical fascia
Technique
Rationale
Subtle cranial techniques support autonomic balance, reduce neural irritability, and improve cerebrospinal fluid circulation; helpful for managing associated pain and promoting parasympathetic tone during recovery
Add-On Approaches
Chinese Medicine
TCM approach includes acupuncture to GB-21, TE-14, LI-10, LI-11 to improve qi flow and blood circulation; moxibustion may support warming and nerve recovery; herbal medicine (e.g., formulas containing Angelica, Rehmannia) addresses qi deficiency and pain
Chiropractic
Cervical spine manipulation and mobilisation to improve foraminal clearance; assessment of cervical posture and shoulder mechanics; may include upper thoracic adjustments if restrictive
Physiotherapy
Structured progressive strengthening programme for rotator cuff and scapular stabilisers; proprioceptive neuromuscular facilitation (PNF) patterns; electrical stimulation to denervated muscles in severe cases; mirror therapy for complex regional pain syndrome; functional retraining for activities of daily living
Remedial Massage
Deep soft tissue massage to scalenes, upper trapezius, levator scapulae; trigger point release to reduce secondary muscle tension; myofascial release to improve tissue mobility; progressive massage as healing progresses; avoid aggressive pressure in acute phase
Rehabilitation Exercises
Pendulum Swings (Codman's Exercise)
Passive Arm Elevation with Opposite Hand
Neck Lateral Flexion Stretch (Away from Affected Side)
Scalene Muscle Stretch with Upper Trapezius
Scapular Retraction and Depression
Isometric Shoulder Abduction
Supine Shoulder External Rotation with Pillow
Prone Shoulder Flexion (Y-position)
Rotator Cuff Strengthening: Side-Lying External Rotation
Proprioceptive Upper Limb Positioning and Weight Shifting
Seated Posture Correction with Cervical Alignment
Progressive Grip Strengthening with Therapy Ball
Referral Criteria
- •Acute severe injury with complete arm paralysis: refer immediately to emergency department and neurosurgeon
- •Suspected nerve root avulsion: urgent specialist imaging (MRI, EMG/NCS) and neurosurgical assessment
- •Horner's syndrome or T1 involvement: specialist assessment for potential nerve transfer surgery
- •Penetrating injury with nerve involvement: immediate surgical exploration
- •Vascular compromise with limb at risk: immediate vascular surgery assessment
- •Lack of improvement after 3 months of conservative care: refer to nerve specialist for advanced imaging and electrodiagnostic testing (EMG/NCS)
- •Development of complex regional pain syndrome: pain specialist and physiotherapy with proven CRPS protocols
- •Progressive muscle atrophy with functional decline: reassessment for possible surgical intervention (nerve grafts, transfers)
- •Severe psychological impact or depression affecting recovery: referral to psychologist or counsellor
- •Occupational/functional demands requiring specialist vocational assessment: occupational therapist for work conditioning