Karthikeyan P Iyengar1, Vijay Kumar Jain2, Shashi Bahl3, Raju Vaishya4. 1. Trauma and Orthopaedic Surgeon, Southport and Ormskirk NHS Trust, Southport PR8 6PN, UK. 2. Associate Professor, Department of Orthopaedics, Atal Bihari Vajpayee Institute of Medical Sciences, Dr Ram Manohar Lohia Hospital, New Delhi 110001, India. Electronic address: drvijayortho@gmail.om. 3. Assistant Professor, Department of Mechanical Engineering, I.K. Gujral Punjab Technical University, Hoshiarpur Campus, Hoshiarpur 146001, Punjab, India. 4. Professor, Department of Orthopaedics, Indraprastha Apollo Hospital, Sarita Vihar, Mathura Road, 110076 New Delhi, India.