A 48-year-old obese male presents with a 6-week history of severe inferomedial heel pain that is worst when he takes his first few steps in the morning, but improves with continued walking. He works as a security guard and stands for 8–10 hours daily. On examination, there is tenderness over the medial calcaneal tubercle, and pain is elicited on dorsiflexion of the toes. The structure marked **D** in the diagram is the primary static support of the medial longitudinal arch. Which of the following is the MOST LIKELY diagnosis and the MOST APPROPRIATE first-line management?

Explanation

## Why "Plantar fasciitis; stretching exercises, heel cushions, NSAIDs, and weight loss with physiotherapy" is right The clinical presentation—inferomedial heel pain worst with first steps in the morning, improvement with activity, occupational prolonged standing, obesity, and positive windlass test (pain on toe dorsiflexion)—is the CLASSIC presentation of plantar fasciitis. The structure marked **D**, the plantar aponeurosis (plantar fascia), is the most important static support of the medial longitudinal arch. Inflammation and microtearing at its calcaneal origin is the pathophysiology of plantar fasciitis, the MOST COMMON cause of heel pain in adults. First-line management is conservative: stretching (calf and plantar fascia), heel cushions/arch supports, NSAIDs, weight loss, and physiotherapy—which is most effective long-term. Approximately 90% of cases resolve within 12 months with conservative management (Gray's Anatomy 42e Ch 84; Apley 10e). ## Why each distractor is wrong - **Achilles tendinopathy; eccentric calf strengthening and corticosteroid injection**: While tight Achilles tendon is a risk factor for plantar fasciitis, Achilles tendinopathy presents with pain at the insertion on the calcaneus (posterosuperior), not inferomedial heel pain. The windlass test is specific to plantar fasciitis, not Achilles pathology. - **Posterior tibial tendon dysfunction; custom orthotic insoles and surgical repair**: PTTD causes medial arch collapse and pain along the medial midfoot/arch, not inferomedial heel pain. It is not the most common cause of heel pain and does not present with the classic morning pain pattern or positive windlass test. - **Calcaneal stress fracture; immobilization in a walking boot for 6–8 weeks**: Stress fractures present with insidious pain that worsens with activity and improves with rest—the opposite of this patient's pattern. There is no history of high-impact trauma or running. Tenderness is typically diffuse over the calcaneus, not localized to the medial tubercle. **High-Yield:** Plantar fasciitis = inferomedial heel pain + worst first steps in morning + positive windlass test + tenderness at medial calcaneal tubercle; 90% resolve conservatively with stretching, supports, NSAIDs, and physiotherapy. [cite: Gray's Anatomy 42e Ch 84; Apley 10e]