Plantar fasciosis is a foot condition characterized by heel pain and pain in your plantar fascia—a strong and dense connective tissue structure on the sole of your foot that supports your foot arch. This condition has historically been called plantar fasciitis because it was believed that plantar fascia inflammation was the principle underlying cause. Plantar fasciosis is a more accurate name for this condition because it involves degeneration—microtears, cell death—of your plantar fascia, not inflammation. See YouTube Video – Plantar Fasciitis or Fasciosis? Active men between the ages of 40 and 70 are most commonly affected by this health problem.