aDepartment of Orthopedics and Spine Surgery, Faculty of Medicine–Ain Shams University, Cairo, Egypt

bDepartment of Orthopedics and Spine Surgery, Faculty of Medicine –Benha University, Qalyubia, Egypt

cDepartment of Orthopedics and Spine Surgery, Faculty of Medicine – Cairo University, Cairo, Egypt

M.F.K.: Research idea, Study plan, Collection of scientific material, Surgical intervention, Database creation, Research writing, Performed measurements, Manuscript preparation. M.M.S. and Y.E.H.: Study design, Manuscript preparation, Surgical intervention, Database creation, Research writing.

Financial Disclosure: Y.E.H is Stockholder in spinecraft company. The remaining authors report no conflicts of interest.

This paper is approved from our research scientific committee.

A written consent was taken from all patients in this study.

Correspondence to Mohamed Fawzy Khattab, MD, El nozha street – Nasr city, Cairo, Egypt Tel: +201001599077; e-mail: [email protected].