Mengden, who turns 24 on Feb. 19, incurred a fracture of the medial tibial sesamoid bone during a bullpen session Jan. 31, according to the A’s. Dr. Kevin Varner performed the surgery ...

When an equine athlete suffers a sesamoid fracture, the owner will often ask his or her veterinarian that daunting question: "What's his prognosis to return to competition?" A team of researchers ...