Das Kopfgewicht des Menschen — ein biomechanisches Problem

Clemens, H. J.

doi:10.1007/bf01880731

Cited by 13 publications

(3 citation statements)

References 4 publications

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“…Probably, this muscle was not sufficiently challenged by lifting the head. Considering a head weight of 3.2 -4.1 kg (Clemens 1972) and a maximal isometric neck extension force of 127 -278 N ≈ 13-28 kg (Valkeinen et al 2002;Rezasoltani et al 2010), a full head lift requires 25% or less of the maximal neck extension force.…”

Section: Discussionmentioning

confidence: 99%

Shear wave elastography reveals different degrees of passive and active stiffness of the neck extensor muscles

et al. 2016

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Section: Discussionmentioning

confidence: 99%

Shear wave elastography reveals different degrees of passive and active stiffness of the neck extensor muscles

et al. 2016

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“…Fixed force levels, instead of percentages of individual maximal force, were selected because the main function of the neck extensor muscles is to manage the weight of the head, which remains the same with neck pain or weaker muscles. The aver-age adult female head is 31 to 36 N. 11 A deskwork task under time pressure 8 was used to simulate a stressful office work condition (TABLE 1). Relaxation and head lift in prone were used to capture a situation of relaxation and the capacity to manage the weight of the head (TABLE 1).…”

Section: Methodsmentioning

confidence: 99%

Neck Muscle Stiffness Measured With Shear Wave Elastography in Women With Chronic Nonspecific Neck Pain

Dieterich¹,

Yavuz²,

Petzke³

et al. 2020

Journal of Orthopaedic & Sports Physical Therapy

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…In the cyclic compression tests, five cylindrical specimens were loaded periodically 90 times with a frequency of 0.3 Hz. The average head-weight of an adult woman ranges from 3.2 to 3.6 kg and that of a man ranges from 3.8 to 4.1 kg [3] . Therefore, the cervical spine is loaded with a compressive force of 41 N when standing.…”

Section: Methodsmentioning

confidence: 99%

Mechanical testing of an absorbable hybrid fusion cage for the cervical spine

Kauth

Hopmann²,

Kujat³

et al. 2012

Biomedizinische Technik/Biomedical Engineering

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Conventional fusion devices ("cages") are often used to join two vertebrae of the human spine and generally remain in the body for a lifetime and can theoretically lead to any complications. Therefore, an absorbable hybrid fusion cage consisting of a magnesium skeleton infiltrated with an absorbable polymer [poly-ε-caprolactone (PCL)] has been developed. The primary objective of the cage is to ensure an adequate stiffness of the disc space directly after the operation and to encourage the ingrowth of the new bone tissue to secure long life stability. Once a sufficiently rigid bone connection is formed, the implant should be absorbed. The purpose of this first study on the new absorbable fusion cage was to investigate the mechanical properties in vitro. Tensile tests were performed with tensile specimens type 1BA according to DIN EN ISO 527 made of PCL foamed using controlled expansion of saturated polymers (CESP). Furthermore, cyclic compression tests and compression tests with steady movement were performed with different designs of the new cage. Compression tests were also performed with vertebral endplates of ovine cadaveric spines. Foaming of PCL resulted in a modulus of elasticity of 135 MPa, which is approximately one third of unfoamed PCL. The results indicate that the initial compression strength of the implants should be adequate for the implantation in the cervical spine.

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Das Kopfgewicht des Menschen — ein biomechanisches Problem

Cited by 13 publications

References 4 publications

Shear wave elastography reveals different degrees of passive and active stiffness of the neck extensor muscles

Shear wave elastography reveals different degrees of passive and active stiffness of the neck extensor muscles

Neck Muscle Stiffness Measured With Shear Wave Elastography in Women With Chronic Nonspecific Neck Pain

Mechanical testing of an absorbable hybrid fusion cage for the cervical spine

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