title: Valid and relevant outcome measures are critical for objective hypothesis-testing.
authors.forename: Brian M
authors.initials: BM
authors.lastname: Ilfeld
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Wright
authors.forename: Daniel I
authors.initials: DI
authors.lastname: Sessler
authors.forename: Terese L
authors.initials: TL
authors.lastname: Chmielewski
mesh_terms: D023381:Endpoint Determination; D006801:Humans; D009407:Nerve Block; D017063:Outcome Assessment, Health Care; D016059:Range of Motion, Articular; D020127:Recovery of Function; D012785:Shoulder Joint / Q000601:surgery*