Viscoelastic creep

Viscoelastic creep is a progressive increase in deformation while a load is maintained. In the spine, it may involve passive tissues and discs. It depends on time and loading conditions and does not automatically indicate injury or a permanent structural change.

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Function and mechanism

Under sustained loading, a tissue can continue changing shape after its initial response. In spinal experiments, this behaviour depends on load, tissue properties and previous loading history. Fluid movement also contributes to disc behaviour. Recovery after unloading can take time and varies with the specimen and conditions rather than following one universal timetable.

Assessment and interpretation

The phenomenon is studied using samples and controlled conditions. Experiments on isolated spinal tissues cannot reproduce all muscular adaptations of a living person. It is therefore inappropriate to infer a universal dangerous sitting duration or conclude that every sensation of stiffness demonstrates permanent tissue deformation or an unstable spine.

Role of TAGMED care

At TAGMED, the concept can support discussion of breaks, position changes and gradual return to a prolonged task. It does not prove that long stretching or decompression favourably remodels a disc. Care decisions still need clinical justification and should be evaluated through useful function rather than an assumed mechanical effect.

Follow-up and warning signs

Follow-up may record activity duration, breaks and recovery. Sudden pain after trauma or new loss of strength requires a separate assessment, without waiting for presumed spontaneous recovery from creep or assuming that continued loading will correct the problem.

Frequently asked questions

Is creep always irreversible?

No. Some deformation may recover after the load is reduced.

Is creep the same as stress relaxation?

No. During creep, loading is maintained while deformation changes.

Does sitting necessarily cause injury?

No. A mechanical response does not by itself establish tissue damage.

Must every break last a fixed time?

No single duration applies to all people, tasks and clinical circumstances.

What is the practical message?

Vary loading according to needs and build tolerance to prolonged activities gradually.

Educational information from The Spine Page. This entry does not replace an individual assessment. Documentary version: October 12, 2026. Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath.