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Open-Access Journal
Review
Charles Philip Gabel, Hamid Reza Mokhtarinia, Markus Melloh, Sébastien Mateo 
World J Orthop 12(4):178-196. Published online Apr 18, 2021. doi: 10.5312/wjo.v12.i4.178
Minireviews
Scott D Buzin, Jeffrey A Geller, Richard S Yoon, William Macaulay 
World J Orthop 12(4):197-206. Published online Apr 18, 2021. doi: 10.5312/wjo.v12.i4.197
Hisatoshi Ishikura, Naoshi Fukui, Mitsuyasu Iwasawa, Satoru Ohashi, Takeyuki Tanaka, Sakae Tanaka 
World J Orthop 12(4):207-213. Published online Apr 18, 2021. doi: 10.5312/wjo.v12.i4.207
Basic Study
Stanislav Bondarenko, Volodymyr Filipenko, Michael Karpinsky, Olena Karpinska, Gennadiy Ivanov, Valentyna Maltseva, Ahmed Amine Badnaoui, Ran Schwarzkopf 
World J Orthop 12(4):214-222. Published online Apr 18, 2021. doi: 10.5312/wjo.v12.i4.214
Retrospective Study
Christopher Bush, Joel J Gagnier, James Carpenter, Asheesh Bedi, Bruce Miller 
World J Orthop 12(4):223-233. Published online Apr 18, 2021. doi: 10.5312/wjo.v12.i4.223
Systematic Reviews
Abigail Frazer, Michael Tanzer 
World J Orthop 12(4):234-245. Published online Apr 18, 2021. doi: 10.5312/wjo.v12.i4.234
Case Report
Thomas Neri, Margaux Dehon, Elisabeth Botelho-Nevers, Celine Cazorla, Sven Putnis, Remi Philippot, Frederic Farizon, Bertrand Boyer 
World J Orthop 12(4):246-253. Published online Apr 18, 2021. doi: 10.5312/wjo.v12.i4.246
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