Objective Structured Assessment of Laparoscopic Salpingectomy (OSALS)
Larsen et al. 19 carried out a blinded prospective cohort study that developed OSALS, which is a method designed to conduct an objective structured assessment of technical surgical skills based on laparoscopic salpingectomy. Like the HASC, OSALS consists of a general rating scale based on OSATS and on a case-specific scale, but three of the task-specific items are directly related to the procedure evaluated: laparoscopic salpingectomy. Two independent observers used the OSALS chart for assessment of 21 unedited video recordings of 21 laparoscopic salpingectomies, performed by 21 different surgeons, grouped as either novices, intermediate or experts. The median score in each group showed that the OSALS tool was construct valid and able to discriminate between all groups (p<0.03).
The overall interrater agreement was 0.831, varying from 0.759 in the experienced group to 0.905 in the intermediate group. There was a wide performance range in the expert group and a narrow performance range in the novice group.