Abstract
INTRODUCTION: The benefits of steroid usage have been well described for unilateral total knee arthroplasty (TKA), however it's benefits in bilateral TKA has not been well published in the literature. We describe the impact of perioperative steroid administration in a cohort of bilateral TKAs (74 knees) with regard to immediate postoperative knee function, postoperative knee strength and opioid consumption. MATERIALS AND METHODS: We report on a single-surgeon consecutive case series of simultaneously-performed bilateral TKAs. Eighteen patients received 2 doses of 8 mg IV dexamethasone in the perioperative setting. There were 19 patients in the control group. Primary outcome measures were day 1 postoperative knee flexion (degrees), knee strength and postoperative analgesic requirements (mg/mcg). Morphine dose equivalents (MDE) were calculated to compare all opioid-based analgesics. Secondary outcomes included post-operative pain according to the VAS (at 24, 48 and 72 h), anti-emetic requirements (mg) and length of stay (days). RESULTS: The mean knee flexion achieved day 1 in the steroid group was 70.1°(σ = 17.64, 95% CI 64.1-76.0) compared to 55.8° in the non-steroid group (σ = 19.8, 95% CI 49.2-62.3) (p = 0.0008). Regarding the straight leg raise, 88.9% of the steroid group were able to achieve this compared to only 55.2% of the non-steroid group (p = 0.002). There was a reduction in the MDE requirement per patient across all medications for the 'steroid' group. Both Targin® (p = 0.03) (Prolonged-Release Oxycodone) and Fentanyl (p = 0.01) requirements were significantly reduced in the 'steroid' group. CONCLUSION: We recommend the use of perioperative steroids in bilateral TKA to allow accelerated rehabilitation, improved immediate knee function and an overall reduction in the consumption of potentially problematic opioid-based analgesics.