title: Corrigendum.
abstract: Failla MJ, Logerstedt DS, Grindem H, et al. Does extended pre-operative rehabilitation influence outcomes 2 years after ACL reconstruction? A comparative effectiveness study between MOON and Delaware-Oslo ACL cohorts. Am J Sports Med. 2016;44(10):2608-2614. (Original DOI: 10.1177/0363546516652594 ).