The posterior oblique sling (POS) comprises the latissimus dorsi and contralateral gluteus maximus which is connected through thoracolumbar fascia, erector spinae, multifidus and bicep femoris. This activation pattern provides stability of the lumbopelvic region by transferring force through the trunk. For insistence, erectus spinae generates force whereas the multifidus creates stability. The posterior oblique sling is thought aid recovery from lower back pain (LBP) and is often a fundamental part of rehabilitation despite minimal research on the topic (Kang and Hwang, 2019). However, most recent research suggests patients with LBP have abnormal motor recruitment in the lumbopelvic region (Kim et. al, 2014); therefore, activating the POS may offer spinal mobility, stability and prevent LBP (Kang and Hwang, 2019).
Prone hip extension (PHE) is a useful measure to assess and activate the POS. In healthy individuals, one should be able to maintain neutral lumbar and pelvic position during PHE, however patients with LBP have been found to have altered lumbar and pelvic movement. This in turn can cause lumbopelvic dysfunction, spinal instability and postural disturbance (Kim et. al, 2014). For example, Kang and Hwang found patients with LBP often have delayed onset of gluteus maximus and earlier onset of bicep femoris (Kang and Hwang, 2019). When the gluteus maximus does not activate, there is a loss of pelvis control which can cause the contralateral latissimus dorsi to become dominant. Therefore, to aid lumbopelvic control, practitioners can manipulate the PHE to focus on the less dominant muscle (Kim et. al, 2014).
Lee et. al altered the PHE technique to assess the impact this has on POS. The PHE was compared to abdominal drawing in maneuverer prone hip extension (ADIM PHE). The ADIM PHE had increased contralateral latissimus dorsi and ipsilateral gluteus maximus compared to hip extension, whereas PHE had increased ipsilateral erector spinae and ipsilateral bicep femoris ((Lee et. al, 2020). Lee et. al also compared PHE to PHE with hip abduction and knee flexion. They discovered the contralateral latissimus dorsi, ipsilateral erector spinae and gluteus maximus electromyography was higher with phone hip extension with hip abduction and knee flexion than PHE (Lee et. al, 2019). Therefore, depending on the clinical presentation of the patient, practitioners can isolate specific muscle groups within the POS. PHE with hip internal rotation and shoulder internal rotation and shoulder extension with 1lb dumbbell was found to be the optimal PHE variation for POS activation to aid recovery with LBP (Kang and Hwang, 2019).
This research highlights the importance of using PHE as an assessment and treatment tool to identify weakness within the POS and then adapting the PHE to support recovery from LBP.
Reference List
Kang, D. and Hwang, Y.-I. (2019). Comparison of Muscle Activities of the Posterior Oblique Sling Muscles among Three Prone Hip Extension Exercises with and without Contraction of the Latissimus dorsi. Journal of The Korean Society of Physical Medicine, 14(3), pp.39–45. doi:https://doi.org/10.13066/kspm.2019.14.3.39.
Kim, J.-W., Kang, M.-H. and Oh, J.-S. (2013). Patients With Low Back Pain Demonstrate Increased Activity of the Posterior Oblique Sling Muscle During Prone Hip Extension. PM&R, 6(5), pp.400–405. doi:https://doi.org/10.1016/j.pmrj.2013.12.006.
Lee, J.-K., Hwang, J.-H., Kim, C.-M., Lee, J.K. and Park, J.-W. (2019). Influence of muscle activation of posterior oblique sling from changes in activation of gluteus maximus from exercise of prone hip extension of normal adult male and female. Journal of Physical Therapy Science, 31(2), pp.166–169. doi:https://doi.org/10.1589/jpts.31.166.
Lee, J.-K., Lee, J.-H., Kim, K.-S. and Lee, J.-H. (2020). Effect of abdominal drawing-in maneuver with prone hip extension on muscle activation of posterior oblique sling in normal adults. Journal of Physical Therapy Science, 32(6), pp.401–404. doi:https://doi.org/10.1589/jpts.32.401.
