Peter Attia· MD
the ubiquitous about 50 of all of us will develop arthritis at the base of our thumb and that's that opposable thumb and that's the problem with that is it's all about biomechanics it has to do too much there's six degrees of freedom it's just this biconcave saddle joint that in order to come back and forth this way radial and ulnar deviation then straight up Palmer abduction that way and then rotating around and pronating in order to oppose the thumb tip to the fingertips it's doing three different directional movements and and this joint is doing this and this and this and it just wears out and so it's just subjected to so many odd stresses and it's unstable like the shoulder by definition Mobility yeah