Validity evidence of the Lateral Step Up (LSU) test for adolescents with spastic cerebral palsy

Abstract

Purpose: The present study examined the concurrent and construct validity of the Lateral Step Up (LSU) test, for adolescents with CP. Method: A total of 35 adolescents, classified as GMFCS Levels I, II and III, were examined using LSU, GMFM – 88 (D & E), other functional mobility measures (TUG, STS, TUDS), body structures and functions (strength, ROM and spasticity). Results: LSU inter-correlations with: (i) GMFM – 88 (D & E) (r = 0.656), (ii) functional mobility measures (r = −0.567 to 0.721) and (iii) body structures and functions (r = 0.155 to 0.563) were at the appropriate range. The LSU differentiated adolescents with CP (F = 16.185, p = 0.000, η² = 0.503), according to their GMFCS (I > II, II > III, I > III). Finally, 50.27% of the LSU variability was explained by GMFCS differences, with 65.7% of adolescents classified correctly across the three levels. Conclusions: The LSU may be perceived as a valid instrument for assessing the functional mobility of adolescents with CP.

Implications for Rehabilitation

• LSU is valid for assessing functional mobility and strength in CP adolescents.

• LSU may be used in accordance with other functional mobility measures in the school environment.

• The LSU may be used from physical therapists to predict the functional mobility of CP adolescents at GMFCS Levels I–III.

Keywords::

• Cerebral palsy
• functional mobility measures
• Lateral Step Up
• validity

Acknowledgments

We would like to thank all the participants and their parents for their contribution in this study, as well as, the directors, faculty and staff of the special schools.

Declaration of Interest: The authors report no conflicts of interest.