Metatarsophalangeal (MTP) Joint Sprain (Turf Toe) By Paul L Liebert, MD, Tomah Memorial Hospital, Tomah, WI Reviewed / Revised Oct 2021 | Modified Nov 2021 View Patient Education Etiology Symptoms and Signs Diagnosis Prognosis Treatment Key Points Metatarsophalangeal (MTP) joint sprain (turf toe) is a sprain of the great toe plantar ligament complex.