24/05/2026
π£ Peripheral Nerve Injuries β Muscle Weakness & Classic Clinical Signs
βͺοΈThis educational infographic summarizes common peripheral nerve injuries and their characteristic muscle weakness patterns, movement deficits, and clinical signs. Recognizing these patterns helps clinicians localize which nerve may be damaged.
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π£ Radial Nerve Injury
πΉ Main muscles affected
β Wrist and finger extensors
πΉ Common weakness
β Difficulty extending the wrist and fingers.
πΉ Classic sign
β Wrist drop
πΉ Common causes
β Mid-shaft humerus fracture, prolonged compression (βSaturday night palsyβ).
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π£ Median Nerve Injury
πΉ Main muscles affected
β Thenar muscles and lateral lumbricals
πΉ Common weakness
β Loss of thumb opposition and fine pinch control.
πΉ Classic sign
β Ape hand deformity
πΉ Common causes
β Carpal tunnel syndrome, forearm trauma, proximal median nerve injury.
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π£ Ulnar Nerve Injury
πΉ Main muscles affected
β Interossei and medial lumbricals
πΉ Common weakness
β Difficulty spreading and closing the fingers.
πΉ Classic sign
β Clawing of the 4th and 5th digits
πΉ Common causes
β Cubital tunnel syndrome, elbow trauma, Guyon canal compression.
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π£ Axillary Nerve Injury
πΉ Main muscle affected
β Deltoid muscle
πΉ Common weakness
β Reduced shoulder abduction from 15Β°β90Β°.
πΉ Classic sign
β Flattened shoulder contour
πΉ Common causes
β Surgical neck humerus fracture, shoulder dislocation.
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π£ Femoral Nerve Injury
πΉ Main muscle affected
β Quadriceps
πΉ Common weakness
β Loss of knee extension and difficulty climbing stairs.
πΉ Reflex change
β Reduced patellar reflex
πΉ Common causes
β Pelvic trauma, retroperitoneal hematoma, surgical injury.
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π£ Common Fibular (Peroneal) Nerve Injury
πΉ Main muscles affected
β Tibialis anterior and ankle dorsiflexors
πΉ Common weakness
β Loss of dorsiflexion
πΉ Classic sign
β Foot drop with high-stepping gait
πΉ Common causes
β Fibular neck injury, prolonged leg crossing, tight casts.
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π£ Why Peripheral Nerve Injuries Matter
πΉ Affect movement and coordination
β Muscle weakness can impair walking, gripping, lifting, and daily function.
πΉ May cause sensory symptoms
β Tingling, numbness, burning pain, or altered sensation can occur.
πΉ Early diagnosis improves outcomes
β Timely rehabilitation may help prevent permanent weakness and muscle wasting.
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π£ Management & Treatment
πΉ Physiotherapy and strengthening exercises
πΉ Nerve protection and ergonomic correction
πΉ Splints or braces when needed
πΉ Treatment of the underlying cause
πΉ Surgical evaluation in severe compression or trauma
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π£ Seek Medical Attention If You Have
πΉ Sudden weakness in the arm or leg
πΉ Foot drop or wrist drop
πΉ Progressive numbness or muscle wasting
πΉ Difficulty walking or gripping objects
πΉ Symptoms after trauma or fracture
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β Medical Disclaimer
This educational post is for general medical awareness only and should not replace professional medical advice, diagnosis, or treatment. Persistent weakness, numbness, or neurological symptoms should be evaluated by a qualified healthcare professional.