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?"
A) The additional joint present doubles the range of motion.
B) The joint capsules and ligaments are more stretchy and loose than normal.
C) Articular cartilage at bone ends is replaced with hyaline cartilage.
D) Greater than normal production of serous fluid lubricates the joint and extends it.

Question

Quizplus · Accepted Answer

Being "double-jointed" is a colloquial term for having hypermobility in one or more joints. This is caused by joint capsules and ligaments that are more stretchy and loose than normal, allowing for a larger range of motion than the average person.

An Individual with a "Double-Jointed" Thumb Can Pull It Back