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Open-Access Journal
Review
Luigi Murena, Massimo Max Morandi, Marko Tomic, Federico Roman, Roberto Fattori, Guido Maritan, Andrea Sborgia, Gianluca Canton 
World J Orthop 12(5):254-269. Published online May 18, 2021. doi: 10.5312/wjo.v12.i5.254
Minireviews
Massimo De Filippo, Daniele Casalini, Alberto Longhi, Fabrizio Tacci, Rocco Perotta, Francesco Pagnini, Silvio Tocco, Francesco Ceccarelli, Francesco Pogliacomi 
World J Orthop 12(5):270-291. Published online May 18, 2021. doi: 10.5312/wjo.v12.i5.270
Retrospective Study
Raj M Amin, Varun Puvanesarajah, Yash P Chaudhry, Matthew J Best, Sandesh S Rao, Steven M Frank, Erik A Hasenboehler 
World J Orthop 12(5):292-300. Published online May 18, 2021. doi: 10.5312/wjo.v12.i5.292
Observational Study
Systematic Reviews
Yousef Marwan, Abdullah Addar, Nizar Algarni, Nabil Algarni, Mark Burman, Paul A Martineau 
World J Orthop 12(5):320-328. Published online May 18, 2021. doi: 10.5312/wjo.v12.i5.320
Case Report
Nithid Sri-utenchai, Nachapan Pengrung, Korakod Srikong, Chedtha Puncreobutr, Boonrat Lohwongwatana, Paphon Sa-ngasoongsong 
World J Orthop 12(5):338-345. Published online May 18, 2021. doi: 10.5312/wjo.v12.i5.338
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