( ( ( ( ( Tough fibers ) , ) ( called ligaments ) ) , ) ( ( ( ( link ( ( the bones ) ( of ( the ( knee joint ) ) ) ) ) and ) ( ( ( hold them ) ( in place ) ) ( while ( ( adding ( ( stability and ) elasticity ) ) ( for movement ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Tough) (NNS fibers)) (, ,) (VP (VBN called) (NP (NNS ligaments))) (, ,)) (VP (VP (VB link) (NP (NP (DT the) (NNS bones)) (PP (IN of) (NP (DT the) (NN knee) (NN joint))))) (CC and) (VP (VB hold) (NP (PRP them)) (PP (IN in) (NP (NN place))) (PP (IN while) (S (VP (VBG adding) (NP (NN stability) (CC and) (NN elasticity)) (PP (IN for) (NP (NN movement)))))))) (. .)))
Tough fibers, called ligaments , link the bones of the knee joint and hold them in place while adding stability and elasticity for movement.
(ROOT (S (NP (NNS Ligaments)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (JJ tough) (NN protein) (NNS fibers))) (SBAR (WHNP (WDT that)) (S (VP (VBZ connects) (NP (NNS bones)) (PP (TO to) (NP (DT each) (JJ other)))))))) (. .)))