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To what extent is the tibia-calcaneum angle a reliable measurement of the triceps surae length? Radiological correction of the torque-angle curve (III).

Authors
  • Tardieu, G
  • Lespargot, A
  • Tardieu, C
Type
Published Article
Journal
European journal of applied physiology and occupational physiology
Publication Date
Sep 16, 1977
Volume
37
Issue
2
Pages
163–171
Identifiers
PMID: 902657
Source
Medline
License
Unknown

Abstract

Previous papers gave some methods for the reliable measurement of the tibia-calcaneum angle. It is of common use to evaluate the physical properties of triceps surae on the basis of torque-angle curves. However this method is reliable only if each tibia-calcaneum angle corresponds to a defined distance between the insertions of the muscle in subjects of the same height. Evidence is given by radiological measurements that this correspondance is correct in normal children. However, this is no longer true in certain cerebral palsied children because of abnormal translation of the calcaneum and/or abnormal ratio of bone sizes. In this case the torque-angle curves do not define properly the torque-length curves. A method of correction is given. This correction may be as high as 15 degrees.

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