Abstract
Introduction
There is no consensus on the ideal pain management strategy following total hip arthroplasty (THA). This study sought to identify immediate changes in the hospital course of patients undergoing primary THA following implementation of a rapid recovery anesthesia and multimodal management of pain (RAMP) protocol. For this study, rapid recovery anesthesia describes the use of preoperative non-narcotic medication in conjunction with neuraxial anesthesia techniques confined to the operating room only. The multimodal pain regimen consists of pre- and post-operative high dose nonsteroidal anti-inflammatories (NSAIDs), gabapentin, and antiemetics with or without intraoperative periarticular anesthetic injection. We hypothesized that the implementation of a RAMP protocol would lead to decreased reported pain scores, decreased narcotic use, and a shorter hospital stay in patients undergoing primary THA.
Methods
This retrospective cohort study performed at a multi-surgeon high-volume institution reviewed the records of 81 consecutive patients who underwent primary THA utilizing traditional anesthesia and an opioid-dependentpain management techniques between June to September 2014 compared to 78 patients who underwent primary THA after implementation of the RAMP protocol between November 2014 to February 2015. The length of stay (LOS), pain scores, narcotic use, and other clinical data were recorded for each study group. Equality of variance was confirmed prior to statistical analysis using t-test for equality of means.
Results
There was no significant difference in the demographics, body mass index, ASA classification, or Charleson Comorbidity Index between the two cohorts. The average LOS was significantly shorter after implementation of the RAMP protocol with a mean of 2.10 ± 1.1 days versus 2.89 ± 1.0 days. Total amount of narcotics used was significantly less with the RAMP protocol (Fig 1). Patient reported pain scores were improved throughout the hospital stay with patients receiving the RAMP protocol reporting significantly less pain beginning the morning of POD 1 (Fig 2). No significant decrease in kidney function was seen following the use of high dose NSAIDs (p=0.18).
Conclusions
The implementation of a RAMP protocol in patients undergoing primary total hip arthroplasty has resulted in an immediate shorter length of stay with less narcotics use and improved reported pain scores. To our knowledge, this is the first study demonstrating a statistically significantly shorter length of stay associated with a multimodal pain protocol. This study supports the benefits of broad implementation a RAMP protocol for total hip arthroplasty.
