hypermobility
noun [ U ] uk/ˌhaɪ.pə.məʊˈbɪl.ə.ti/ /ˌhaɪ.pɚ.moʊˈbɪl.ə.t̬i/
（关节）可动性增加，过度松弛，过度变形显著
a condition in which someone is able to move and bend their joints (= places where bones join such as in your fingers, at your knees, etc.) more than is usual
This is a genetic condition affecting collagen (a basic building block of the body), which then causes hypermobility of the joints. 这是一种影响胶原蛋白（身体的基本组成部分）的基因状况，会导致关节过度松弛。
For most children these muscle cramps are due to hypermobility - excessive suppleness or being "double-jointed". 对于大多数儿童来说，这些肌肉痉挛是由于关节过度松弛造成的，即关节过度柔软或 "双关节"情况。
- More examples
- His problem was hypermobility in his ligaments, causing his ribs to move out of place.
- People who spend a lot of time at a desk or have hypermobility in their spine are likely to have postural problems.
- The syndrome occurs in patients with joint hypermobility.
- Those with hypermobility syndrome can perform all sorts of amazing feats, such as bending their thumb right back until it touches their forearm, and their knees left and right as well as forwards.