Is there any benefit to joining different surgery/ortho/neurosurg interest groups in medschool? Does being an active member of groups like this give you a leg up when trying to match into surgery? Is there any benefit to joining them at all?
Does any faculty or PD actually notice whether or not an applicant is a member of any Med School Surgery Clubs?
No. So there is not likely any direct correlation between membership and getting a surgical residency.
However, as others have noted, they can make contacts for you, offer interesting lectures and conferences, etc. which you might not hear about if you weren't a member. But the simple fact of being a member, even holding an office, doesn't amount to a hill of beans in the application process.
Even being an officer?
Are ECs of any use then? Seems like we're expected to have them (in addition to research, grades, high step 1 score)...