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Jason, Butlers "The Sensitive Nervous System" (2000) discusses this problem in some depth. One of his arguments for identifying adverse neural tension compared to hamstring tightness are studies done in asymptomatic individuals looking at performance of the slump test (Chapter 11). It was found that most subjects could extend their knee further with the addition of cervical extension, with medial rotation of the hip and ankle dorsiflexion reducing the range of knee extension. If there is an increased range of knee extension in the slump with cervical extension would this not tell us neural mobility may be a limiting factor? On the other hand, as shown by studies quoted by Butler is this not a normal response? In studies attempting to analyse ANT and hamstring strains would it be more valid to try to look at differences between knee extension with the neural tissues "unloaded" compared to loaded as opposed to absolute values? I certainly know what you are saying (i hope), can we really differentiate between the two? Looking at things post injury I think neurodynamic tests are very informative when taken in context of the rest of the presenting signs and symptoms. Cheers for now. Steve Aspinall BSc (hons) GSR Sports Rehabilitator Bolton Therapy Centre Bolton UK _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.