( ( Medial rotation ) ( ( ( involves ( ( a torsion ) ( of ( the ( distal bone ) ) ) ) ) ( so ( that ( ( the ( reference point ) ) ( is ( ( moved ( ( anteriorly or ) medially ) ) ( toward ( the ( body midline ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Medial) (NN rotation)) (VP (VBZ involves) (NP (NP (DT a) (NN torsion)) (PP (IN of) (NP (DT the) (JJ distal) (NN bone)))) (SBAR (RB so) (IN that) (S (NP (DT the) (NN reference) (NN point)) (VP (VBZ is) (VP (VBN moved) (ADJP (JJ anteriorly) (CC or) (JJ medially)) (PP (IN toward) (NP (DT the) (NN body) (NN midline)))))))) (. .)))
Medial rotation involves a torsion of the distal bone so that the reference point is moved anteriorly or medially toward the body midline.
(ROOT (S (NP (JJ Medial) (NN rotation)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (NN rotation)) (PP (IN of) (NP (NP (DT a) (NN bone)) (PP (IN toward) (NP (NP (DT the) (NN midline)) (PP (IN of) (NP (DT the) (NN body))))))))))) (. .)))