The “Iranian Journal of Orthopaedic Surgery” (IJOS) is the official scientific quarterly publication of Iranian Orthopaedic Association. Contributions from national and international researchers are welcome and are considered on their merits. Submitted manuscripts must be written in English. Authors are advised to follow the “Instructions to Authors” while submitting their manuscripts. Manuscripts are subjected to primary screening by the Editor and then to blinded peer review by experts in the field and a final decision will then be made by the Editor. Papers are assessed according to the quality and relevance of the work, not by the country of origin, the reputation of the author, or the fame of the department. Our aim is to publish the best articles available in the field of orthopaedic surgery from anywhere in the world. This Journal accepts Original articles, Review articles (Systematic and Narrative), Short Communications, Case Reports, and Letters to the Editor in the field of Orthopaedic Surgery.