Office Chair Twisting

Twisting or rotating on an office chair may cause harm to the lumbar spine, and injuries resulting from chair malfunctions during normal use, if meeting certain conditions, are generally considered work-related injuries.

Mechanism of Lumbar Spine Injury from Office Chair Rotation

The physiological structure of the lumbar spine makes it ill-suited for rotational movements, being more adapted to flexion and extension. When the waist rotates more than 15 degrees, stress concentration occurs in the posterolateral region of the intervertebral discs. The rotational function of an office chair amplifies this harm. When a person sits on a chair and rotates, the upper body turns while the pelvis remains relatively fixed, forcing the lumbar spine to bear torsional forces. After sitting continuously for more than 60 minutes, the intradiscal pressure in the lumbar spine rises to 1.85 times that of standing. At this point, performing rotational movements increases the risk of annulus fibrosus rupture by more than threefold. Clinical data shows that 60% of patients with lumbar disc herniation had a habit of frequently rotating their office chairs before the onset of their condition. This indicates a close link between the rotational function of office chairs and lumbar spine injuries. Long-term frequent use of the rotational function can gradually accumulate damage to the lumbar spine, increasing the likelihood of lumbar disc herniation.

Impact of Core Muscles on Injury Risk

Weak core muscles exacerbate the risk of injury from office chair rotation. Core muscles play a crucial role in maintaining spinal stability. When core muscle strength is insufficient, they cannot effectively buffer and disperse the torsional forces the lumbar spine endures during rotation, leading to increased pressure on the lumbar spine and a higher likelihood of injury. Therefore, individuals with weak core muscles should avoid frequent rotation when using office chairs and can enhance core muscle strength through appropriate exercises to reduce the risk of lumbar spine injury.

Work-Related Injury Determination for Twists Caused by Office Chair Malfunctions

If an injury occurs due to a malfunctioning office chair during normal use for work purposes (such as office work or handling work-related tasks), and it meets the three criteria of "working time, workplace, and work-related cause," it is generally considered a work-related injury. This means that during work hours, within the workplace, and due to the need to use an office chair for work, if a physical twist occurs due to the chair's quality issues or malfunctions, it meets the basic conditions for work-related injury determination. One can apply for work-related injury determination and enjoy corresponding work-related injury benefits in accordance with relevant regulations.