RT Journal Article SR Electronic T1 Clinical Orthopaedics JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 82 OP 83 DO 10.1136/oem.13.1.82-a VO 13 IS 1 A1 Griffiths, D. Ll YR 1956 UL http://oem.bmj.com/content/13/1/82.2.abstract AB