Schiffman CJ, Hannay WM, Whitson AJ, et al. - The following questions concerning previous non-arthroplasty surgery prior to primary anatomic shoulder arthroplasty (either total shoulder arthroplasty [TSA] or ream-and-run arthroplasty) are addressed in this study: (1) To what degree is primary anatomic shoulder arthroplasty after prior non-arthroplasty surgery, vs arthroplasty without previous surgery, linked with inferior clinical outcomes and higher revision rates? (2) Do outcomes after anatomic arthroplasty are affected by type, approach, or timing of previous surgery? Researchers identified 640 patients undergoing anatomic shoulder arthroplasty (345 TSAs and 295 ream-and-run arthroplasties) via retrospectively reviewing a primary shoulder arthroplasty database. Outcomes revealed correlation of previous surgery with inferior clinical outcomes and higher revision rates in patients undergoing index TSA but not in those undergoing the ream-and-run procedure. Risk of reoperation was noted to be highest for patients with previous fracture surgery.