By Marnix van Holsbeeck
For an outfielder with posterior tibial tendon insufficiency (PTTI/PTTD), the main concern is loss of dynamic arch support, resulting in pain, decreased push-off power, impaired sprinting, and reduced ability to cut or change direction. The posterior tibial tendon is a key stabilizer of the foot during running and acceleration. [my.clevela...clinic.org], [footcaremd.org]
In baseball, this can lead to:
Reduced first-step explosiveness when reacting to a hit ball.
Slower acceleration and sprint speed.
Difficulty with lateral movement and sudden direction changes.
Fatigue and pain along the medial ankle and arch during prolonged play
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