Adoption of Robotic Adrenalectomy: A Two-Institution Study of Surgeon Learning Curve

Background Robotic adrenalectomy is feasible and safe, yet concerns over increased operative times and the learning curve (LC) for proficiency have limited its adoption. This study aimed to assess the LC for robotic adrenalectomy. Methods This is a two-institution retrospective review of consecutive unilateral minimally invasive adrenalectomies performed by four high-volume adrenal surgeons between 2007 and 2022. Two surgeons transitioned from laparoscopic to robotic adrenalectomy, and two surgeons adopted the approach, with proctoring, after completion of fellowship training without robotic experience. Operative time and complications were analyzed. Multivariable regression was used to identify factors associated with operative time. The number of cases required to overcome the LC was determined using the LC-cumulative-sum (LC-CUSUM) analysis. Results Of 457 adrenalectomies, 182 (40%) were laparoscopic and 275 (60%) robotic. The robotic approach was associated with shorter median operative time (106 vs 119 min; p = 0.002), fewer complications (6% vs 13%; p = 0.018), and fewer conversions to open adrenalectomy (1% vs 4%; p = 0.030), with no difference between the senior and junior surgeons. On adjusted analysis, factors associated with increased operative time were male sex ( p < 0.001), BMI > 30 kg/m 2 ( p < 0.001), and higher gland weight ( p < 0.001). The LC-CUSUM analysis showed proficiency after 8–29 procedures. Compared with the first 10 cases, there was a mean reduction in operative time of 14 min after 10–20 cases, 28 min after 20–30 cases, and 29 min after > 30 cases, regardless of surgeon experience. Discussion With dedicated teams and proctoring, robotic adrenalectomy can be safely adopted at high-volume centers with a minimal LC.