This is what was done to my hand:
First joint of thumb - Joint fusion (arthrodesis). In arthrodesis, your surgeon permanently fuses the bones in the affected joint to increase stability and reduce pain. The fused joint can then bear weight without pain, but has no flexibility. Very difficult to hold a small needle as the thumb does not bend but it's worth it not to cry when I bump it. (taken from Mayo Clinic website)
This is what he did to the base of my thumb:
Joint replacement (arthroplasty). In this procedure, your surgeon removes part or all of the affected joint and replaces it with a graft from one of your tendons. New plastic or metal devices called prostheses also are being developed to replace the joint. Currently, however, doctors prefer soft tissue (tendon) arthroplasty. (taken from Mayo Clinic website)
Here is some general information:
http://www.assh.org/Public/HandCondi...Baseofthe.aspx
hope this helps.
Peggy