From the *National Primary Care Research and Development Centre, University of Manchester, Manchester, United Kingdom; †Nuffield Orthopaedic Centre, Oxford, United Kingdom.

Address reprint requests to

Martin Roland

National Primary Care Research and Development Centre

University of Manchester

Williamson Building, Oxford Road

Manchester M13 9PL, UK

E-mail: [email protected]

Some of the text of this article has been derived, with permission, from Fairbank and Pynsent. 31