Butera KA, Fox EJ, Bishop MD, et al. - Using walking performance, pain, and disability measures, this study empirically derived low back pain (LBP) subgroups and validated these subgroups. Researchers included 70 individuals with LBP who had undergone testing for a priori ascertained sensory (temporal summation; conditioned pain modulation), psychological (positive affect/coping; negative coping), and motor (trunk extensor muscle activation during forward bending and walking) measures. Data demonstrate the construct validity of this multidimensional subgrouping approach. There is a need for longitudinal studies to ascertain if the Maladaptive subgroup is predictive of poor outcomes, such as pain chronicity or persistent disability.