Authors' Conclusions : The effectiveness of local corticosteroid injections was studied in only two small randomized controlled trials of poor methodologic quality. Both studies showed better short-term effects of corticosteroid injection combined with lidocaine compared with lidocaine alone on the treatment success outcome. In one study, the effects of corticosteroid injections lasted up to four months. No adverse effects were observed. The available evidence for the effectiveness of intratendon sheath corticosteroid injection for trigger finger can be graded as a silver level evidence for superiority of corticosteroid injections combined with lidocaine over injections with lidocaine alone.