Plantar Fasciitis Series
Part 2 Nerves & Muscles Involved in Plantar Fasciitis
Nerves Involved
- Medial Calcaneal Nerve: A branch of the Tibial Nerve supplying the heel pad and medial plantar surface. Often irritated by repetitive traction or inflammation near the Medial Calcaneal Tubercle, causing localized heel pain.
- Lateral Plantar Nerve (Baxter’s Nerve): The first branch of the Lateral Plantar Nerve, running near the Plantar Fascia and Abductor Hallucis. Entrapment (Baxter’s Nerve entrapment) can mimic or coexist with Plantar Fasciitis, producing medial heel pain.
- Tibial Nerve (Tarsal Tunnel Region): Compression behind the Medial Malleolus can cause referred heel pain, requiring differentiation from Plantar Fasciitis during assessment.
Muscles Involved
- Gastrocnemius & Soleus: Limited flexibility reduces ankle dorsiflexion and increases strain on the Plantar Fascia during gait. Chronic tightness transmits tension through the Achilles–Plantar Fascia connection.
- Flexor Digitorum Brevis: Lies above the Plantar Fascia; overuse or inflammation can increase local stress on the Fascia.
- Abductor Hallucis: Provides medial arch support; imbalance or weakness alters loading on the Plantar Fascia.
- Quadratus Plantae & Lumbricals: Stabilize the toes during push-off; dysfunction raises mechanical demand on the Plantar fascia.
- Intrinsic Foot Muscles: Weak stabilizers (e.g., Interossei, Flexor Hallucis Brevis) reduce the arch’s load absorption capacity, leading to Fascia overstrain.
Clinical Insight
Plantar Fasciitis involves both myofascial and neural components. Muscle imbalance, calf tightness, and nerve entrapment often coexist. Effective management should target muscle flexibility (especially calf complex), neural mobility, and biomechanical correction through orthotics and stretching.
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