ATHLETIC THERAPY TODAY  JULY 2010  9  © 2010 Human Kinetics - ATT 15(4), pp. 9-12 NKLE instability associated with an inver- sion injury mechanism has primarily been related to excessive inversion displacement of the foot segment in relation to the leg segment, excessive lateral tilt of the talus within the tibio-fibular mortise, and excessive anterior translation of the talus from beneath the tibio-fibular mortise. Rehabilitation exercises, external ankle supports, and surgical reconstruction techniques tend to focus on restraint of excessive ankle motion within the frontal plane, but the literature contains considerable evidence that antero-lateral rotary instability (ALRI) within the transverse plane leads to chronic ankle dysfunction and progressive chondral degeneration. The subtalar sling (ST sling) ankle taping procedure has been advocated Michael G. Dolan, MA, ATC, CSCS, Report Editor Analysis of Rotary Ankle Instability and Taping Restraint in a Cadaver Specimen RESEARCH REPORT Gary B. Wilkerson, EdD, ATC • University of Tennessee at Chattanooga; Jesse F. Doty, MD • University of Tennessee College of Medicine – Chattanooga; Larry R. Gurchiek, DA, ATC and J. Marcus Hollis, PhD • University of South Alabama as a means to restrain ALRI (Figures 1 & 2). 1 The pur- pose of this report is to present the findings of a study that quantified internal rotation of the foot segment of a cadaver specimen with ankle ligaments intact, after sequential sectioning of three selected ligaments, with the presence of a Gibney tape configuration, and with the addition of ST sling component to a Gibney tape configuration. A Figure 1 Vertical  and  antero-posterior  components  of  vector  created  by tension within the ST sling, which is oriented perpendicular to the  functional axis of the STJ. Reprinted with permission from Wilkerson  GB.  Biomechanical  and  neuromuscular  effects  of  ankle  taping  and  bracing. J Athl Train. 2002;37:436-445. Figure 2 Restraint  of  ALRI  provided  by  tension  within  the  ST  sling,  which increases with inversion of the STJ and external rotation of the  leg.  Reprinted  with  permission  from  Wilkerson  GB.  Biomechanical  and neuromuscular effects of ankle taping and bracing.  J Athl Train.  2002;37:436-445.