Hip abductor weakness is often seen clinically in patients with chronic, non-specific low back pain (CNSLBP). The current study aimed to assess differences in gluteus medius, maximus and TFL strength between subjects with CNSLBP and healthy subjects. Manual muscle tests were used to determine strength with the 1-5 strength scale. The authors found a significant difference in strength between the groups, particularly on the affected side in subjects with unilateral pain. There was also a significant correlation between unilateral low back pain and trendelenburg sign.