Os trigonum syndrome is a rare injury which occurs when the leg and the foot act like a nutcracker, crushing the pea-sized bone and causing severe pain.

While the Colts do not believe the os trigonum is the cause of Luck's problems, the bone's rarity sparked questions of its own.

Andrew Luck Injury 2019 was diagnosed as a calf strain, then an injury to the rare Os Trigonum, and now Indianapolis Colts think it's something else.

Indianapolis Colts quarterback Andrew Luck has mysterious leg pain, and he reportedly has an extra foot bone, the Os Trigonum, which could be the source.

Conditions he treats include osteochondral lesions or fractures of the talus and tibia, ankle instability, anterior and posterior ankle impingement, os trigonum syndrome, talonavicular ...

Misdiagnosed foot, ankle injuries may result in arthritis, chronic pain and disability Date: January 30, 2017 Source: American Osteopathic Association Summary: Front-line physicians are advised to ...