( There ( ( may ( ( be ( shoulder pain ) ) ( during ( ( ( active ( external rotation ) ) or ) ( concentric ( medial rotation ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (MD may) (VP (VB be) (NP (NN shoulder) (NN pain)) (PP (IN during) (NP (NP (JJ active) (JJ external) (NN rotation)) (CC or) (NP (JJ concentric) (JJ medial) (NN rotation)))))) (. .)))
There may be shoulder pain during active external rotation or concentric medial rotation.
(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))))))))))) (. .)))