What are the anterior trimlines of a TLSO?

The anterior trimlines of a TLSO (thoracolumbosacral orthosis) are typically defined as extending from the xiphoid process to the symphysis pubis. This area is critical because the xiphoid process serves as a stable landmark on the thorax, while the symphysis pubis provides a clear reference for the lower end of the orthosis. The primary goal of these trimlines is to provide adequate support and restriction of motion in the thoracic and lumbar regions while allowing for possible variations in design to fit individual anatomy.

The trimlines must ensure the orthosis effectively stabilizes the thoracolumbar region, which is particularly important in cases involving spinal injuries or post-operative care. By encompassing this area, the TLSO can help control posture, limit spinal flexion and extension, and support the healing process after surgery or trauma. The anterior trimlines are therefore fundamental in not only ensuring fit and comfort but also in achieving the desired biomechanical outcomes for the patient.

The other choices do not accurately represent the anterior trimlines commonly used in TLSOs and could lead to inadequate support or coverage.