Published posters / Gait & Posture 24S (2006) S98–S289 S191 Fig. 1. Three-dimensional power during straight gait and the spin turns. Bold labels are those associated with the ipsilateral pivot. * Indicates significant difference. inertia during the pivot phase. The actual pivot phase required three specific power phases in the transverse plane (A2T, K2T, H2T), which provided rotational power to displace the CoG toward the new direction. The rotational power at the ankle appears to have been a result of a counter movement during the deceleration phase, which resulted in an absorption A1T phase prior to the generation A2T phase. The timings of the transverse power peaks suggest that rotation was coming down the kinetic chain initiated from the hip. However, it is probable that the upper body segments lead the pivot [1]. The ipsilateral crossover turn did not require increased muscular demand during the turn phase, as there was no pivot phase suggesting the turn was a result of a fall rather than by any active means. Because there was no pivot and the foot was rooted to the ground, to complete the crossover, an H3T generation phase externally rotated the hip/pelvis toward the new direction. References [1] Taylor, et al. A three-dimensional biomechanical comparison between turning strategies during the stance phase of walking. Hum Mov Sci 2005;24:558–73. [2] Orendurff, et al. The kinematics and kinetics of turning: limb asymmetries associated with walking a circular path. Gait Posture 2006;23:106–11. [3] Patla. Visual control of human locomotion. In: Patla AE, editor. Adapt- ability of Human Gait. North-Holland: Elsevier Science Publishers; 1991. p. 55–97. [4] Davis, et al. A gait analysis data collection and reduction technique. Hum Mov Sci 1991;10:575–87. [5] Eng, Winter. Kinetic analysis of the lower limbs during walking: what information can be gained from a three- dimensional model? J Biomech 1991;28:753–8. doi:10.1016/j.gaitpost.2006.11.132 PP-065 Kinematic modifications after surgical correction of equinovarus foot deformity in chronic hemiplegic adults Franco Molteni a,∗ , Stefano Carda a , Michele Bertoni b , Paolo Zerbinati b , Mauro Rossini a , Luciana Magoni a , Marco Caimmi a a H.V. Beretta, Costamasnaga, LC, Italy b Pol. Multimedica, Castellanza, VA, Italy 1. Summary/conclusions Equinovarus foot is one of the most common deformity in chronic spastic hemiplegia of the adult. Gait analysis can be a powerful tool to assist clinicians in surgical decision and during the follow up, to provide objective, reliable and repetible data about outcome. In this retrospective study we have investigated 177 patients which underwent surgical treatment for spastic equinovarus foot deformity. Gait analysis provided a use- ful tool to objective outcome assessment. Data from a wide group of patients can make clinicians more confident with surgical treatment of this deformity.