Iselin disease is a uncommon cause of ache on the lateral side of the feet in youths and adolescents. This condition is an osteochondrosis or apophysitis due to traction in the base of the fifth metatarsal bone. The peroneal tendons tendon connects on the site and puts the metatarsal with a lot of stress. https://podiatrynewyorkcity.com/iselins-disease-of-the-fifth-metatarsal/