Operative Exposure, Mentorship, and Gender: A Narrative Review of the Determinants of Subspecialty Fellowship Pursuit in Orthopedic Surgery Residents

Fellowship training has become a near-universal component of orthopedic surgical education, yet the factors driving residents toward specific subspecialties remain incompletely characterized. Identifying these determinants is essential for residency program directors, fellowship training programs, and professional societies seeking to optimize workforce development and address persistent disparities in subspecialty representation. A comprehensive narrative review of 75 peer-reviewed studies was conducted using systematic searches of PubMed, Google Scholar, and SciSpace. Quantitative survey data, national fellowship match statistics, and qualitative findings were synthesized to characterize factors influencing fellowship selection across five major orthopedic subspecialties: sports medicine, spine surgery, arthroplasty (adult reconstruction), pediatric orthopedics, and trauma. Fellowship selection is a multifaceted decision driven by intrinsic motivation, operative exposure in residency, mentorship relationships, and practical considerations that vary substantially across subspecialties. Sports medicine applicants prioritize clinical outcomes, personal interest, and operative variety. Arthroplasty candidates emphasize intellectual challenge and mentorship quality, whereas pursuit of a spine fellowship shows the strongest correlation with operative volume during residency (108.4 ± 50.7 vs. 74.4 ± 60.2 cases, p < 0.01). Pediatric orthopedics attracts the highest proportion of female applicants at 25% and is distinguished by program directors' emphasis on interview performance and letters of recommendation. Significant gender disparities persist, with female representation ranging from 3% in spine to 25% in pediatrics against an overall mean of 11%. Quantitative trauma-specific selection data remain limited in the published literature. Personal interest and subspecialty passion are universal drivers in fellowship selection, while operative volume, mentorship quality, intellectual challenge, and financial considerations shape distinctive applicant profiles across subspecialties. The more-than-eightfold variation in female representation across fellowships suggests the need for targeted mentorship initiatives, culture assessments, and increased visibility of role models, particularly in spine surgery.