Postoperative pain following ACL reconstruction can be alleviated with an ultrasound-guided femoral triangle block (FTB). However, it is the investigators' observation that 10-20 % of the patients still complain of intense pain localized in the center of the knee.~Cadaver dissection studies have shown that an injection into the distal part of the adductor canal will spread to the popliteal fossa, and one dissection study showed consistent spread to the popliteal plexus.~The study team hypothesized that a PPB will reduce the postoperative pain, when it is used as a supplement to the FTB in patients undergoing ACL reconstruction.
The study aims to investigate the effect of the popliteal plexus block (PPB) on postoperative pain in patients undergoing anterior cruciate ligament (ACL) reconstruction.