Quinn L, Khalil H, Dawes H, et al; for the Outcome Measures Subgroup of the European Huntington's Disease Network. Reliability and minimal detectable change of physical performance measures in individuals with pre-manifest and manifest Huntington disease. Phys Ther. 2013;93:942–956.

In Appendix 3 of this article published in the July 2013 issue of PTJ, the testing protocol for the Sharpened Romberg test with eyes open is described incorrectly. The correct description is: (3) Sharpened Romberg test–eyes open: Each participant should stand on a level surface wearing flat shoes with his or her feet aligned in a strict tandem heel-to-toe position, arms crossed over the chest, and the open palm of the hand falling on the opposite shoulder. Once stable, the participant should attempt to maintain that position for 30 seconds. If the participant fails to maintain the position by movement of either arms or feet, the time taken to failure should be noted.

• © 2013 American Physical Therapy Association