[Effect of muscular dysfunction on the development of shoulder joint in children with Erb's paralysis]

Area of Science:

• Pediatric Orthopedics
• Pediatric Neurology
• Developmental Biology

Background:

• Erb's palsy, a form of brachial plexus birth palsy, can lead to significant developmental disturbances in the shoulder joint.
• Understanding these disturbances is crucial for timely intervention and management in affected children.
• Existing research highlights functional deficits, but detailed structural changes require further elucidation.

Purpose of the Study:

• To evaluate developmental disturbances of the shoulder joint in children diagnosed with Erb's palsy.
• To correlate radiological and electrophysiological findings with structural changes in the shoulder joint.
• To investigate the underlying mechanisms contributing to these developmental abnormalities.

Main Methods:

• Radiological examination of the shoulder girdle and humerus using anterior-posterior projection X-rays.
• Clinical electromyography (EMG) to assess the functional state of shoulder girdle muscles.
• Analysis of growth, ossification, joint morphology, and spatial relationships within the shoulder joint.

Main Results:

• Retardation in growth and ossification of the radial head of the humerus on the affected side.
• Decreased longitudinal and cross-sectional sizes of the humerus.
• Delayed development of the glenoid cavity, altered spatial relationships, and impaired internal rotation of the shoulder joint.

Conclusions:

• Erb's palsy is associated with significant structural and anatomical abnormalities in the developing shoulder joint.
• Observed changes include growth retardation, altered joint morphology, and impaired biomechanics.
• These abnormalities are linked to neurotrophic process disruptions and muscular dysbalance.