Obstetric Brachial Plexus Palsy: Erb Palsy Infant Splinting
In short
Obstetric brachial plexus palsy produces the classic waiter tip posture. Gentle caregiver handling and positioning prevent infant joint contractures.
In this guide (5 sections)
Obstetric brachial plexus palsy (OBPP): historically termed Erb palsy when involving the C5-C6 upper nerve roots: occurs during complicated vaginal deliveries complicated by shoulder dystocia, large birth weight, or breech presentation. Traction on the infant neck stretches or ruptures the upper trunk, causing characteristic weakness of shoulder abduction, external rotation, elbow flexion, and forearm supination. The infant arm adopts the classic waiter tip posture, requiring early, gentle physiotherapy to prevent permanent joint contractures.
Domestic and Cultural Indian Realities
In Indian households, the diagnosis of Erb palsy can provoke intense family anxiety, guilt, and confusion. Traditional practices of tightly swaddling infants with arms bound straight against the torso or carrying babies by their armpits can worsen glenohumeral deformities. Hand therapists provide culturally sensitive guidance on safe handling: pinning the infant sleeve across the chest during early rest, supporting the baby under the bottom rather than the axilla, and engaging parents in daily gentle exercise routines.
Surgical Pathoanatomy and Biomechanical Principles
The pathological posture results from unopposed action of intact subscapularis, pectoralis major, and latissimus dorsi muscles pulling the humeral head into persistent internal rotation and adduction. Without active external rotation, the posterior glenoid rim undergoes developmental hypoplasia, leading to posterior humeral head subluxation or dislocation (Shepherd deformity). Gentle passive range of motion and nocturnal positioning in abduction and external rotation help preserve glenoid morphology.
Postoperative Rehabilitation Phases and Splinting Protocols
During the initial 10 to 14 days, the arm is rested against the chest to allow delivery-related perineural swelling to subside. Active therapy then begins with gentle passive joint range of motion into shoulder external rotation and supination, performed during diaper changes. Fabricated thermoplastic night splints (Statue of Liberty position: 60 degrees abduction, 60 degrees external rotation) maintain joint flexibility without over-stretching the anterior joint capsule.
Gentle Scapula-Stabilized Humeral External Rotation
Objective: Preserve posterior glenohumeral congruency and stretch contracted subscapularis muscle in infants
- 1Place the infant lying comfortably on their back on a soft, padded surface during a calm moment.
- 2Use one hand to gently stabilize the infant shoulder blade (scapula) against the chest wall.
- 3Gently bend the infant elbow to 90 degrees, keeping the upper arm resting against the side.
- 4Using light fingertip pressure, slowly rotate the infant forearm outward away from the belly.
- 5Hold the gentle external rotation for 5 seconds without applying force, then return smoothly to neutral.
| Infant Age | Clinical Priority | Neurological Assessment Target |
|---|---|---|
| Birth to 2 Weeks | Rest period, pin sleeve across chest, avoid axillary lifting | Rule out clavicle fracture and phrenic nerve injury |
| 3 Weeks to 3 Months | Gentle passive ROM, tactile stimulation, parent handling guidance | Monitor for active biceps recovery against gravity |
| 3 to 6 Months | Bilateral reaching play, weight-bearing on tummy, night splinting | Critical surgical decision window if biceps recovery is absent |
| 6 to 12 Months | Functional play training, preventing posterior shoulder subluxation | Evaluation for nerve transfers or secondary tendon releases |
Red Flags and Specialist Escalation
Failure to show any active anti-gravity elbow flexion (biceps contraction) or active shoulder external rotation by 3 to 4 months of age is a critical red flag. These infants require prompt pediatric orthopaedic or brachial plexus surgeon evaluation for nerve grafting or nerve transfer surgery.
Frequently Asked Questions
Will my baby recover arm movement without surgery?
Many infants with mild stretch injuries (neuropraxia) recover full arm function within the first few months through gentle exercises. Regular clinical check-ups monitor nerve recovery and determine whether surgical support is needed.
Do I need a doctor referral to start infant physiotherapy on BookPhysio.in?
BookPhysio.in does not ask for a doctor referral. Direct access is protected by the NCAHP Act 2021. You consult qualified pediatric physiotherapists and pay per session with complete fee transparency.
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