Review Question - QID 218580

A 21-year-old professional ballerina presents to your office for evaluation of posterior ankle pain that has been present for about 6 months. The patient reports mastering en pointe dancing last year which was showcased in her winter recital. She has no history of injury and reports the pain began insidiously. NSAIDs and therapy have not provided relief. On exam, she has pain over the posteromedial ankle with associated crepitus. She has pain with forced plantarflexion of the ankle. There is no tenderness over the metatarsal head. With toe rise, the affected heel inverts. Which of the following structures is most closely linked to the patient's symptoms?