Effects of the Mulligan Traction Straight Leg Raise Technique on Range of Movement

Abstract

The Mulligan traction straight leg raise (SLR) technique is used therapeutically to increase range of SLR when it is limited due to low-back dysfunction or hamstring tightness. The effects of this technique were investigated in 26 normal subjects (mean age 26 years; 13 male). As the movement of SLR comprises hip flexion and posterior pelvic rotation, ranges of SLR and posterior pelvic rotation were measured pre- and post-intervention using two bubble inclinometers. Prior to data collection, SLR was performed four times to minimize increased movement due to repetitive stretch. Following the intervention, the mean range of SLR significantly increased by 13.3° or 27%, from 49.9° to 63.2°. Mean range pelvic rotation also significantly increased but by only 2.7°. Hip flexion was the major reason for increased range of SLR following the intervention, indicating an increase in hamstring muscle stretch tolerance. The possible mechanisms for improvement in range are discussed.