Why do my thumbs ache after typing on a smartphone keyboard for 20 minutes?
1. Introduction Typing on a smartphone keyboard forces the thumbs into rapid, repetitive flexion and awkward lateral extensions that they are not biomechanically designed to sustain. This localized mechanical overload causes microtrauma and inflammation in the flexor tendons and the basal joint of the thumb, resulting in an acute ache after just twenty minutes of … Read more