Traditional spinal fusion (spinal fusion) is considered the gold standard of care for this condition. However, there is growing evidence that post-fusion there are limitations in lumbar motion, altered spinal dynamics, and accelerated degeneration of adjacent segments that can lead to recurrence of lumbar instability and spinal stenosis. In this context, the exploration of a more physiologically appropriate surgical approach, i.e., a nonfusion technique, has begun to receive attention. The concept of “dynamic stabilization”, also known as “soft stabilization”, was developed and defined as a stabilization system that preserves beneficial motion and intersegmental load transmission without It is defined as a stabilization system that preserves beneficial motion and intersegmental load transfer without fusion of the vertebral segments. In other words, this stabilization system modifies the load transfer to the spinal motion segment, preventing spinal motion in the direction and plane of motion that produces pain. These built-ins mimic normal spinal motion and, when applied, produce activity that is as similar as possible to the normal spine. Although their respective indications are not identical, there are several broad categories of nonfusion techniques for the treatment of lumbar spine disorders: 1) anterior surgical artificial disc replacement and artificial nucleus pulposus replacement, and 2) posterior nonfusion techniques (posterior dynamic stabilization, PDS) with (1) interspinous internal fixation bracing devices, (2) power stabilization devices fixed via the pedicle, and (3) arthroplasty. The so-called Wallis system: this system has undergone many designs and is one of the longest studied lumbar interspinous internal fixations. The first generation of the Wallis system began in 1986 with a titanium alloy, and Senegas et al. developed the second generation of Wallis based on the first generation, which now consists of an interspinous spacer and two stiff, elastic polyester straps, the entire system forming a “floating” device between the spinous processes, with no permanent fixation of the vertebral body. There is no permanent fixation, which increases stability during the instability phase. The main difference from the first generation is the change in spacer material to polyether ether ketone (PEEK), as the modulus of elasticity of PEEK is better matched to the posterior structure of the vertebral body. The Wallis system, with its simple technique, no significant early complications and good early to mid-term results, is a good choice for cases with severe preoperative slippage. The pictures above show the built-in Wallis in kind, and the operating tools. Wallis, as a long-used non-fusion technique of the spine, preserves the space for movement of the spine, avoids the stress concentration that occurs after fusion, and provides space for preserving the patient’s spinal function and further treatment.