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The weight of the head, which averages somewhere between six and eight kilograms, thus has a detrimental lever-arm effect for the facet joints. Scientific studies show that around one third of the adult population suffers from neck problems, even though these problems do not always require treatment.Ī normal young adult can turn his/her head to either side approximately 90°, incline it forwards at an angle of around 45° and bend it backwards and forwards at an angle totaling 130°. The cervical spine (neck) is the most mobile segment of the spine and is predisposed to complaints brought about by wear-and-tear phenomena.