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Open-Access Journal
Minireviews
Luigi Valentino Berra, Andrea Di Rita, Federico Longhitano, Enrico Mailland, Paolo Reganati, Alessandro Frati, Antonio Santoro 
World J Orthop 12(12):961-969. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.961
Anil Thomas Oommen, Triplicane Dwarakanathan Hariharan, Viruthipadavil John Chandy, Pradeep Mathew Poonnoose, Arun Shankar A, Roncy Savio Kuruvilla, Jozy Timothy 
World J Orthop 12(12):970-982. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.970
Basic Study
Dimitrios Kitridis, Dimosthenis Alaseirlis, Nikolaos Malliaropoulos, Byron Chalidis, Patrick McMahon, Richard Debski, Panagiotis Givissis 
World J Orthop 12(12):983-990. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.983
Case Control Study
Giuseppe Solarino, Ilaria Bortone, Giovanni Vicenti, Davide Bizzoca, Michele Coviello, Giuseppe Maccagnano, Biagio Moretti, Fabio D'Angelo 
World J Orthop 12(12):991-1000. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.991
Retrospective Study
Laura A Carrillo, Hao-Hua Wu, Aman Chopra, Matt Callahan, Toshali Katyal, Ishaan Swarup 
World J Orthop 12(12):1001-1007. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.1001
Prospective Study
Federico Morelli, Giorgio Princi, Matteo Romano Cantagalli, Marco Rossini, Ludovico Caperna, Daniele Mazza, Andrea Ferretti 
World J Orthop 12(12):1016-1025. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.1016
Randomized Controlled Trial
Lode A van Dijk, Antonius MJS Vervest, Dominique C Baas, Rudolf W Poolman, Daniel Haverkamp 
World J Orthop 12(12):1026-1035. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.1026
Systematic Reviews
Biju Benjamin, Paul Ryan, Yulia Chechelnitskaya, Levent Bayam, Turab Syed, Efstathios Drampalos 
World J Orthop 12(12):1036-1044. Published online Dec 18, 2021. doi: 10.5312/wjo.v12.i12.1036
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