Which mechanism is MOST likely to contribute to medial tibial stress syndrome?

Which mechanism is MOST likely to contribute to medial tibial stress syndrome?

• A. Pronation distal anterior tibialis attachment
• B. Pronation proximal posterior tibialis attachment
• C. Pronation proximal anterior tibialis attachment
• D. Supination proximal flexor digitorum attachment

Answer: (B)

Medial tibial stress syndrome arises from repetitive traction on the medial border of the tibia caused by excessive pronation. The structure most implicated is the posterior tibialis, which originates on the proximal posterior tibia. When the foot over-pronates, the posterior tibialis tendon experiences increased tensile load at that proximal tibial attachment, pulling on the tibia and irritating the periosteum along the posteromedial border. Repeated stress this way leads to shin pain. Other attachments described in the options involve different muscles and locations that are less likely to produce the medial tibial periosteal irritation seen with MTSS.

Medial tibial stress syndrome arises from repetitive traction on the medial border of the tibia caused by excessive pronation. The structure most implicated is the posterior tibialis, which originates on the proximal posterior tibia. When the foot over-pronates, the posterior tibialis tendon experiences increased tensile load at that proximal tibial attachment, pulling on the tibia and irritating the periosteum along the posteromedial border. Repeated stress this way leads to shin pain.

Other attachments described in the options involve different muscles and locations that are less likely to produce the medial tibial periosteal irritation seen with MTSS.