Pankaj Kandwal1, G Vijayaraghavan2, B N Upendra3, Arvind Jayaswal2. 1. Department of Orthopaedics, All India Institute of Medical Sciences, Rishikesh, Uttrakhand, India. 2. Department of Orthopaedics, Primus Superspeciality Hospital, New Delhi, India. 3. Department of Orthopaedics, Jain Institute of Spine Care and Research, Bengaluru, Karnataka, India.