## Origin of the Plantar Fascia **Key Point:** The plantar fascia originates from the medial tubercle of the calcaneus, a bony prominence on the plantar (inferior) surface of the heel bone. ### Anatomical Course and Attachments 1. **Origin:** Medial tubercle of the calcaneus 2. **Course:** Extends anteriorly across the plantar surface of the foot in three bands: - Medial band (abductor hallucis) - Central band (largest, most prominent) - Lateral band (abductor digiti minimi) 3. **Insertion:** Divides into five slips that attach to the plantar plates of the metatarsophalangeal joints and blend with the flexor tendon sheaths ### Structure and Function **High-Yield:** The plantar fascia is a thick, fibrous aponeurosis that: - Acts as a passive tension band supporting the medial longitudinal arch - Becomes taut during the "windlass mechanism" in propulsion (toe extension causes the fascia to shorten, elevating the arch) - Is the most common site of heel pain (plantar fasciitis) due to repetitive microtrauma at its calcaneal origin **Mnemonic:** **MEDIAL** = Medial tubercle is the origin (remember: the **medial** side of the heel is where the fascia **begins**). ### Clinical Correlation **Clinical Pearl:** Plantar fasciitis presents with: - Heel pain worse with first steps in the morning or after rest - Tenderness at the medial calcaneal tuberosity - Pain reproduced by dorsiflexion of the toes (windlass test) - Often associated with tight gastrocnemius-soleus complex and obesity 
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