Medial Tibial Stress Syndrome
Pain along the inner shin from running and jumping
The medical name is medial tibial stress syndrome (MTSS); it was traditionally called "tibial periostitis."
Repeated loading causes pain spread over a long, broad area along the inner side of the middle-to-lower third of the shinbone — a common sports overuse injury. It is now understood not as inflammation of the periosteum alone, but as stress accumulating in the bone itself — an early stage on a continuum that can progress to a stress fracture if training continues.
It is often seen in sports with lots of running and jumping, such as track and field, basketball, and soccer.
Each time you land while running or jumping, stress builds up in the shinbone
Overpronation (ankle rolling inward), hard surfaces, and worn-out shoes make it worse
Pain develops over a long, broad area along the inner edge of the shin
Many people can expect improvement with the right treatment and form correction, though recovery varies from person to person and symptoms can recur. Because it is important to rule out a stress fracture, an MRI or other detailed exam is recommended if pain continues or if you have strong pain at a single pinpoint spot.