The use of various muscle energy techniques to address fascial restrictions, in addition to three-dimensional correction within scoliosis-specific exercise approaches, suggests that these exercises may have different effects on thoracolumbar fascia thickness. This may, in turn, lead to varying impacts on low back pain and functional improvement. Therefore, the aim of this study is to investigate the effects of different scoliosis-specific exercise approaches on thoracolumbar fascia thickness, low back pain, and function in individuals with idiopathic lumbar scoliosis and chronic low back pain.

Low back pain is the most common complaint among individuals with lumbar scoliosis. In a study conducted in Japan, the prevalence of low back pain was reported as 34.7%, which was nearly three times higher than that observed in students without scoliosis. Pain resulting from scoliosis leads to a high level of functional disability, which consequently reduces quality of life.

The thoracolumbar fascia consists of dense connective tissue layers separated by loose connective tissue that allows the tight layers to glide over one another during trunk movement. It provides a mechanical connection between the lumbar spine and several muscles, including the transversus abdominis, portions of the latissimus dorsi, and the internal oblique muscles. In individuals with idiopathic scoliosis, thickening of this fascia has been observed, and it has been reported that this thickening is further increased in the presence of chronic low back pain. Fascial thickening in individuals with scoliosis has been proposed as a potential factor contributing to both pain and movement restrictions.

In the treatment of scoliosis, scoliosis-specific exercise approaches are widely used. These approaches typically include various active self-correction strategies (based on the location, shape, and magnitude of the curve) and individually tailored exercises. Some scoliosis-specific exercise approaches incorporate techniques such as contract-relax, myofascial release, trigger point therapy, and joint mobilization to eliminate muscular and fascial restrictions that impede movement, thereby preparing individuals with scoliosis for three-dimensional correction. In addition, these exercises have been reported to exert positive therapeutic effects on pain and quality of life in individuals with idiopathic scoliosis.

The use of various muscle energy techniques to address fascial restrictions, in addition to three-dimensional correction within scoliosis-specific exercise approaches, suggests that these exercises may have different effects on thoracolumbar fascia thickness. This may, in turn, lead to varying impacts on low back pain and functional improvement. Therefore, the aim of this study is to investigate the effects of different scoliosis-specific exercise approaches on thoracolumbar fascia thickness, low back pain, and function in individuals with idiopathic lumbar scoliosis and chronic low back pain.

Inclusion Criteria:

• Aged 11-24 years
• Diagnosed with idiopathic scoliosis
• Presenting a single lumbar curve pattern
• Experiencing low back pain for more than 3 months
• Pain intensity ≥3 on the Visual Analog Scale (VAS)

Exclusion Criteria:

• History of spinal surgery
• Received any scoliosis treatment within the last year
• Current use of a spinal brace
• Regularly used pain medication
• Presence of neurological, congenital, rheumatological or psychological disorders

Individual Participant Data (IPD) will not be shared due to ethical considerations and participant privacy. The study involves sensitive health information of participants with chronic low back pain and idiopathic lumbar scoliosis. Sharing individual-level data could risk identifiability, despite anonymization efforts. Data will be used solely for the current research purposes, including thesis work and related publications.

In this study, both the participants and the assessor measuring thoracolumbar fascia thickness are blinded to group allocation.