An individual with a "double-jointed" thumb can pull it back

Last updated: 7/8/2022

An individual with a "double-jointed" thumb can pull it back towards the wrist much farther than normal. What does it mean to be "double-jointed?" the additional joint present doubles the range of motion articular cartilage at bone ends is replaced with hyaline cartilage greater than normal production of serous fluid lubricates the joint and extends it the joint capsules and ligaments are more stretchy and loose than normal