Table 1.

Classification of Included Articles

Type of Study	Definition
Original data	Any clinical study using patient data (cohort studies, case-control studies, randomized controlled trials)
Database	Any study using a national, insurance, or publicly available large database
Nonoriginal	Any study based on previously published research (systematic reviews, meta-analyses)
Biomechanical study	Any study using cadavers, bone models, and testing apparatuses
Cellular study	Any preclinical study involving in vitro experimental designs and/or animal models
Anatomic study	Any study defining anatomic distances, landmarks, and/or structural relationships without any biomechanical testing
Review	Any concept review article
Other	Any study not fitting into one of the above categories (cost/economic analysis studies, surveys of surgeons, education studies, validation of outcome instruments or classification systems, mathematical studies, computer modeling studies, technique articles)