Thumb Anatomy: Why One Digit Is 40% of Your Hand
Surgeons rate the thumb at around 40% of hand function. Why opposition is the move nothing else can do, why the base joint wears out, and what that number changes about treatment.
Surgeons rate the thumb at around 40% of hand function. Why opposition is the move nothing else can do, why the base joint wears out, and what that number changes about treatment.
Eight small bones in two rows, held by ligaments rather than muscles. The four that matter clinically, the ligament that fails most, and why pointing beats describing.
Returning to work is a dosing problem, not a fitness verdict. Sort your job into four demands, climb a four-stage ladder, and ask for accommodations specific enough to be granted.
Median, ulnar, radial — each owns specific fingers and muscles. Which fingers go numb is the most useful fact you can bring to an appointment, and which half of the ring finger matters.
Trigger finger, Dupuytren’s, carpal tunnel and a stiff painless hand aren’t four unlucky coincidences in diabetes. They’re one collagen process — and the prayer sign finds it.
Four movements, not a page of twenty. Tendon glides, blocked bending, intrinsic stretch and rotation — plus the dosing rule that matters more than the exercise choice.
The wrong splint does nothing; the right one worn too long costs you strength. Which of the four types fits your problem, when to wear it, and the stopping rule nobody gives you.
A lot of “carpal tunnel” is a nerve root in the neck. The pattern that tells them apart, which finger maps to which level, and why double crush makes wrist surgery fail.
Most musicians’ hand pain is a practice-volume problem. But a finger that curls only at the instrument and never hurts is focal dystonia, and it needs entirely different help.
Gaming hand pain isn’t mysterious — it’s volume and position. Which symptom means a nerve, which means a tendon, and the three setup changes that actually reduce the load.