Résumé : Objective The aim of our study was to analyse the effects of the diacutaneous fibrolysis (hooking technique), on the passive ankle dorsiflexion. Methodology We conducted a crossed, controlled and randomised blind test on 34 healthy subjects to compare the effects of a hooking session with a placebo intervention. The passive range of motion was assessed with an experimental device allowed to impose a defined force. Results We found a significant gain of dorsiflexion after the hooking for each level of tension studied (P < 0.0001). When compared with the placebo, the gains observed with the hooking technique are significantly higher, whatever the tension applied (P < 0.002). Discussion and conclusion Hooking treatment was associated with a gain of dorsiflexion, which is higher than the effect of a placebo. Given the positive results achieved on healthy subjects, it would be interesting to investigate the clinical usefulness of this technique in pathological situations. Level of evidence 2.