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Background The increasing trend toward outpatient surgery has stimulated the development of techniques focused on decreasing perioperative and postoperative pain. Pain control infusion pumps are gaining in popularity in orthopaedic procedures to control postoperative pain. Hypothesis Continuous infusion of bupivacaine via a catheter placed intra-articular into the knee after anterior cruciate ligament reconstruction using ipsilateral autograft quadrupled semitendinosus will decrease postoperative pain scores and narcotic and NSAID consumption. Study Design Randomized controlled trial; Level of evidence, 1. Methods: Three randomized study groups of 21 subjects were evaluated group I, 0.25% bupivacaine infused intra-articular at 4 mL/hour for 72 hours (study); Group II, 0.9% saline infused intra-articular at 4 mL/hr for 72 hours (placebo); Group III, no intra-articular infusion catheter (control). Each subject received general anesthesia and preemptive intra-articular anesthesia. Visual analog scale pain scores and analgesic use were compiled for the 96-hour study period. Results With the exception of significantly higher total narcotic usage in the control group compared with the study group only for the time period of 48 to 72 hours, there were no other statistically significant differences between each of the study groups with respect to pain and narcotic and NSAID use for the entire study period. Conclusion The continuous infusion of intra-articular bupivacaine via pain control infusion pumps after anterior cruciate ligament reconstruction using ipsilateral autograft quadrupled semitendinosus cannot be supported when postoperative visual analog scale pain scores and analgesic use are the rationale for justification.

Sensation is achieved through the integration of many neural elements: receptors, afferent and efferent neurons, the spinal cord with its subdivisions, and the higher brain centers. One of the many sensations perceived by the human body is that of pain or nociception. To understand the concept of "back pain" associated with various spinal pathologies, some basic knowledge of the anatomy and physiology of sensation, and more specifically nociception, is necessary. This knowledge is presented herein.