Prone Knee Bend in test LBP

In clinical practice its becoming more apparent that we need to understand what is a normal reaction to a clinical test. This may sound obvious but what is the normal increase in lumbar lordosis during the prone lying knee flexion test? This article demonstrates the need for greater understanding of common clinical tests. Read it through and see how it increases your understanding of this test.

Changes in lumbar lordosis during prone lying knee flexion test in subjects with and without low back pain

Amir, Arab, et al 2015

Abstract: Prone lying knee flexion (PKLF) is one of the clinical tests used for assessment of the lumbo-pelvic movement pattern. Considerable increase in lumbar lordosis during this test has been considered as impairment of movement patterns in lumbar-pelvic region. However, no study has directly evaluated the change in lordosis during active PLKF test in subjects with low back pain (LBP). The purpose of this study was to investigate the change of lumbar lordosis in PLKF test in subjects with and without LBP.

Subjects: Chronic non-specific LBP (N = 40, mean age: 40.84 ± 17.59) and with no history of LBP (N = 40, mean age: 23.57 ± 10.61). Lumbar lordosis was measured with flexible ruler, first in prone position and then on active PKF test in both subjects with and without LBP. Data was analyzed by using statistical methods such as, independent t-test an paired t-test.

Results: Statistically significant differences in lumbar lordosis between prone position and after active PLKF in both subjects with and without LBP (P < 0.0001). The amount of change in lordosis during PLKF test was not significant between the two groups (P = 0.65). However these changes were greater among patients with LBP.

Conclusion: Increase in lordosis during the test may be due to excessive flexibility of the lumbar spine into extension and abnormal movement patterns in individuals with LBP.

This article develops the idea that clinicians must understand what is normal if they are to position themselves to decide when a patient performs a test abnormally.

Arab et al. Chiropractic & Manual Therapies (2015) 23:18

DOI 10.1186/s12998-015-0061-z