UCLA beats Oregon in Pac-12 semifinals; Adem Bona is injured
LAS VEGAS — Adem Bona sprawled on the court, using every inch of his massive wingspan to chase the loose ball. His immediate grimace and clutching of his left shoulder area led to wincing from an entire fan base.UCLA could not absorb another serious injury.Already down their best defender, the Bruins lost another starter midway through the second half when Bona stayed down for a lengthy stretch before getting up and walking slowly to the locker room Friday night at T-Mobile Arena.The absence of Bona alongside Jaylen…