Chronic low back pain is a symptom often encountered throughout the world, and it has a considerable impact on society. When
confronted with it, sufferers may adopt a behaviour that consists of avoiding any movement that could exacerbate the pain. This can
lead to a vicious circle of fear, immobility and pain. This has a negative impact on rehabilitation, quality of life and morale. A
wide range of therapeutic approaches can be used, including medication, manipulation, massage, physical activity, relaxation,
biopsychosocial approaches and surgery, including lumbar arthrodesis, to reduce long-term pain. 
The contribution of functional analysis (statics, posture, movement, walking) to the development, diagnosis and therapeutic
monitoring of patients suffering from low back pain is promising, but clinical studies supporting its relevance are rare. With our
study, we aim to help verify the clinical relevance of functional analysis by studying the static (spinal curvatures, posture) and
dynamic (movement and walking) differences that we might encounter in people with lumbar arthrodesis compared with asymptomatic
people, and to better understand the role of functional assessment and optimise its use in clinical practice.