The document discusses the common peroneal nerve, which branches from the sciatic nerve and includes the deep and superficial peroneal branches. These nerves provide sensation to the anterior and lateral parts of the legs and tops of the feet, and innervate muscles that lift the ankle and toes. A peroneal nerve injury, also called foot drop, affects one's ability to lift the foot at the ankle and can be caused by spinal cord injuries, underlying diseases like ALS or MS, or complications from hip replacement surgery or other injuries. Symptoms of peroneal nerve injury include inability to point toes, pain, weakness, numbness, loss of foot function, and a high-stepping or footdrop gait.

1. Peroneal Nerve Injury
Presented by
Usman farooq
Student Doctor of Physical Therapy

2. COMMON PERONEAL NERVE
• The common peroneal nerve branches from
the sciatic nerve. It includes the deep and
superficial peroneal branches. These nerves
provide sensation to the anterior (front) and
lateral (side) parts of the legs and to the top of
the feet. They innervate muscles in the legs
which lift the ankle and toes upward (dorsi
flexion).
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4. dermatomes
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5. • Anatomy Formed by: Axons from L4, L5, S1 & S2 root
• Deep peroneal nerve passes through: Anterior tarsal tunnel
• Divides into lateral and medial terminal branches
• Lateral terminal branch: Supplies Extensor digitorum
brevis & Extensor hallucis brevis
• Medial terminal branch
• Supplies adjacent sides of great & 2nd toes (92%)
• Absent in 8%: Muslces supplied by Superficial peroneal
nerve
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6. • Branches
– Common peroneal in popliteal fossa: Sensory
– Superficial peroneal
• Motor
– Peroneus brevis
– Peroneus longus
– Accessory deep peroneal branch: Innervates Extensor digitorum brevis
• Cutaneous sensory
– Lower leg: Anterolateral
– Foot: Dorsum, except between 1st 2 toes
– Medial & Intermediate dorsal cutaneous nerves of foot
– Deep peroneal
• Motor branches in leg
– Tibialis anterior
– Extensor hallucis & Extensor digitorum longus
– Peroneus tertius
• Lateral terminal branch in foot
– Extensor digitorum brevis
» May also be innervated by accessory deep peroneal from superficial peroneal (28%)
– Cutaneous: Skin between 1st & 2nd toes
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7. PERONEAL NERVE INJURY
• peroneal nerve injury (also called foot drop or
drop foot), is a peripheral nerve injury that
affects a patient’s ability to lift the foot at the
ankle.
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8. A foot drop
• Causes of peroneal nerve injury (foot drop)
• Foot drop injury can be caused by an injury to the
spinal cord or
• from other underlying diseases, such as
amyotrophic lateral sclerosis (ALS)
• , multiple sclerosis (MS),
• Parkinson's disease.
• Sometimes, drop foot is a complication from hip
replacement surgery, or other injuries (e.g., knee
or joint dislocation or fracture, herniated disc).
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9. • Symptoms of peroneal nerve injury (foot drop)
• Symptoms of peroneal nerve injury (foot drop) may
include:
• Inability to point toes toward the body (dorsi flexion)
• Pain
• Weakness
• Numbness (on the shin or top of the foot)
• Loss of function of foot
• High-stepping walk (called steppage gait or footdrop
gait)
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Questions?