Group 1(Control) patients will undergo routine arthroscopically assisted ACLR surgery with a standardized postoperative protocol. Group 2 (Experimental) patients will undergo the same procedure with the same postoperative protocols as Group 1, with the addition of the posterior capsular injection of 20 cc of Marcaine 0.5%. There are no placebo treatments being offered and the surgeons and operating room staff are not blinded to the subjects group. Injecting marcaine in this study will be performed in accordance with its standard use according to the FDA labeling/guidelines. The physicians will use their discretion as to the appropriate location for the injection into the posterior capsule of the knee which should bring no additional risks than expected for a knee injection.