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Strain behavior of the distal achilles tendon: implications for insertional achilles tendinopathy.

Publication ,  Journal Article
Lyman, J; Weinhold, PS; Almekinders, LC
Published in: Am J Sports Med
March 2004

BACKGROUND: The changes associated with Achilles insertional tendinopathy (AIT) are seen in the anterior portion of the Achilles tendon near its calcaneal insertion. Strain behavior of this portion of the tendon was evaluated. HYPOTHESIS: The highest strains are in the anterior portion of the tendon. STUDY DESIGN: Controlled laboratory study. METHODS: Six cadaveric legs were tested. While moving through a functional range of ankle motion, strains in five different regions of the tendon insertion were tested. First, the load on the tendon was increased from 30 to 170 N in the starting, plantar flexed position. Then, the ankle was moved from a plantar flexed position into dorsiflexion. RESULTS: Strains in the posterior sites increased significantly (P < 0.001) as the movement into dorsiflexion occurred. This was significantly (P < 0.01) different than the anterior sites, which showed a trend toward decreasing strain. CONCLUSIONS: Although the anterior portion of the Achilles tendon is generally affected in AIT, relative strain shielding is seen in this portion of the tendon. These findings suggest that the role of repetitive tensile loads in the causation of AIT is more complex than often described. CLINICAL RELEVANCE: These findings may explain the variable therapeutic response following measures aimed at decreasing tensile loads on the tendon.

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Published In

Am J Sports Med

DOI

ISSN

0363-5465

Publication Date

March 2004

Volume

32

Issue

2

Start / End Page

457 / 461

Location

United States

Related Subject Headings

  • Weight-Bearing
  • Tendinopathy
  • Range of Motion, Articular
  • Orthopedics
  • Middle Aged
  • Male
  • Humans
  • Female
  • Cadaver
  • Biomechanical Phenomena
 

Citation

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Chicago
ICMJE
MLA
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Lyman, J., Weinhold, P. S., & Almekinders, L. C. (2004). Strain behavior of the distal achilles tendon: implications for insertional achilles tendinopathy. Am J Sports Med, 32(2), 457–461. https://doi.org/10.1177/0095399703258621
Lyman, Jeffrey, Paul S. Weinhold, and Louis C. Almekinders. “Strain behavior of the distal achilles tendon: implications for insertional achilles tendinopathy.Am J Sports Med 32, no. 2 (March 2004): 457–61. https://doi.org/10.1177/0095399703258621.
Lyman J, Weinhold PS, Almekinders LC. Strain behavior of the distal achilles tendon: implications for insertional achilles tendinopathy. Am J Sports Med. 2004 Mar;32(2):457–61.
Lyman, Jeffrey, et al. “Strain behavior of the distal achilles tendon: implications for insertional achilles tendinopathy.Am J Sports Med, vol. 32, no. 2, Mar. 2004, pp. 457–61. Pubmed, doi:10.1177/0095399703258621.
Lyman J, Weinhold PS, Almekinders LC. Strain behavior of the distal achilles tendon: implications for insertional achilles tendinopathy. Am J Sports Med. 2004 Mar;32(2):457–461.
Journal cover image

Published In

Am J Sports Med

DOI

ISSN

0363-5465

Publication Date

March 2004

Volume

32

Issue

2

Start / End Page

457 / 461

Location

United States

Related Subject Headings

  • Weight-Bearing
  • Tendinopathy
  • Range of Motion, Articular
  • Orthopedics
  • Middle Aged
  • Male
  • Humans
  • Female
  • Cadaver
  • Biomechanical Phenomena