Review ArticlesAcetabular Rim Disorders/Pincer-type Femoroacetabular Impingement and Hip ArthroscopyLarson, Christopher M. MD*; LaPrade, Robert F. MD, PhD*; Floyd, Edward R. MS†; McGaver, Rebecca S. MS, ATC*; Bedi, Asheesh MD‡Author Information *Twin Cities Orthopedics, Edina, MN †Georgetown University School of Medicine,Washington, DC ‡Department of Orthopedic Surgery, University of Michigan Hospitals, Ann Arbor, MI Disclosure: R.F.L.: American Journal of Sports Medicine: editorial or governing board. American Orthopaedic Society for Sports Medicine: board or committee member. Arthrex Inc.: IP royalties; paid consultant; research support. International Society of Arthroscopy, Knee Surgery, and Orthopaedic Sports Medicine: board or committee member. Journal of Experimental Orthopaedics: editorial or governing board. Knee Surgery, Sports Traumatology, Arthroscopy: editorial or governing board. Linvatec: research support. Ossur: IP royalties; paid consultant; research support. Smith & Nephew: IP royalties; paid consultant; research support. C.M.L.: Smith & Nephew: paid consultant. A.B.: American Orthopaedic Society for Sports Medicine: board or committee member. Arthrex Inc.: IP royalties; paid consultant. SLACK Incorporated: publishing royalties, financial, or material support. Springer: publishing royalties. The remaining authors declare no conflict of interest. Reprints: Asheesh Bedi, MD, Department of Orthopedic Surgery, University of Michigan, MedSport, Lobby A, Domino’s Farms, 24 Frank Lloyd Wright, Ann Arbor, MI 48106. Sports Medicine and Arthroscopy Review: March 2021 - Volume 29 - Issue 1 - p 35-43 doi: 10.1097/JSA.0000000000000296 Buy Metrics Abstract Femoroacetabular impingement (FAI) can lead to acetabular impaction, chondral injury, and labral pathology secondary to deformities of the proximal femur (CAM-type FAI), acetabulum (pincer-type FAI), or with combined FAI. While the majority of cases are of the combined type, this paper focuses on acetabular overcoverage/pincer-type deformities. Various pincer subtypes include focal anterior overcoverage, global retroversion, global overcoverage/profunda, protrusio, subspine impingement, and os acetabuli/rim fracture variants. A thorough history and physical examination, plain radiographs, magnetic resonance imaging, 3-dimensional computerized tomography, and diagnostic injections can lead to an accurate assessment of pincer-type variants. Appropriately indicated arthroscopic management techniques and pearls for the various pincer subtypes can lead to improved patient-related outcome measures and a high rate of return to athletic activity for the majority of these patients. Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.