Andrew Carr & Jeremy Fairbank 
Outcome Measures in Orthopaedics and Orthopaedic Trauma, 2Ed [PDF ebook] 

Orthopaedics and orthopaedic trauma are highly complex subjects that can prove difficult to quantify, but accurate measurement is required for setting standards of care and for assessing the severity of an injury. This book will help the reader assess outcome instruments, and provides many references to sources of instruments and techniques to use.