( ( Ligament sprains ) ( ( are ( ( ( the ( second ( ( most common ) injury ) ) ) , ) ( followed ( by ( contusions ( , ( concussions ( , ( and fractures ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Ligament) (NNS sprains)) (VP (VBP are) (NP (NP (DT the) (JJ second) (ADJP (RBS most) (JJ common)) (NN injury)) (, ,) (VP (VBN followed) (PP (IN by) (NP (NNS contusions) (, ,) (NNS concussions) (, ,) (CC and) (NNS fractures)))))) (. .)))
Ligament sprains are the second most common injury, followed by contusions, concussions, and fractures.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN concussion)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN type)) (PP (IN of) (NP (NN brain) (NN injury))))) (. .)))