hypomobility

noun

hy·​po·​mo·​bil·​i·​ty ˌhī-pō-mō-ˈbil-ət-ē 

plural hypomobilities

: a decrease in the range of movement of which a body part and especially a joint is capable

There may be mandibular hypomobility and deviation on opening.

—Steven J. Scrivani et al., The New England Journal of Medicine

hypomobile

ˌhī-pō-ˈmō-bəl, -ˌbīl, -ˌbēl 

adjective

hypomobile joints