Patients who suffered from a rupture of the Anterior Cruciate Ligament with instability of the knee joint, will be treated with an operative ACL-reconstruction. One group of patients will stay one night in the hospital and go home the other day (Group I). The other group of patients will go home the same day of surgery (Group II). All patients will undergo the same arthroscopic reconstruction of the ACL. Anesthesia will be performed on each patient in a classic manner. At the end of the surgery each group of patients will be randomly divided in two subgroups: one group will get an injection in the knee joint with 20 ml of physiological fluid (Group Ia en IIa), the other group will get an injection in the knee joint with 20 ml of chirocaine 0.125%, a widely used pain-medicine (Group Ib and IIb). This will happen in a double blind, randomized way. The whole procedure takes about one hour. After surgery patients are brought to the recovery room and are observed every 30 minutes for the duration of 4 hours. Before being brought to their rooms, patients will have to fill in a VAS: Visual Analogue Scale, to determine their pain. After being brought to their rooms, the patients will have the choice of going home the same day or staying in the hospital for one night, according to the amount of pain they are in. That moment it will be possible to switch groups. Patients who go home the same day of surgery will be contacted by phone the day after to fill in a question form. Patients who were admitted for one night will be seen before their leave to fill in the same question form.
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Visual Analogue Scale
Timeframe: within 4 hours after surgery