Challenging the Perceptions of Human Tendon Allografts: Influence of Donor Age, Sex, Height, and Tendon on Biomechanical Properties
The use of allograft tendons has increased for primary and revision anterior cruciate ligament reconstruction, but allograft supply is currently limited to a narrow range of tendons and donors up to the age of 65 years. Expanding the range of donors and tendons could help offset an increasing clinic...
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Published in | The American journal of sports medicine Vol. 51; no. 3; p. 768 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.03.2023
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Subjects | |
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Abstract | The use of allograft tendons has increased for primary and revision anterior cruciate ligament reconstruction, but allograft supply is currently limited to a narrow range of tendons and donors up to the age of 65 years. Expanding the range of donors and tendons could help offset an increasing clinical demand.
To investigate the effects of donor age, sex, height, and specific tendon on the mechanical properties of a range of human lower leg tendons.
Descriptive laboratory study.
Nine tendons were retrieved from 39 fresh-frozen human cadaveric lower legs (35 donors [13 female, 22 male]; age, 49-99 years; height, 57-85 inches [145-216 cm]) including: Achilles tendon, tibialis posterior and anterior, fibularis longus and brevis, flexor and extensor hallucis longus, plantaris, and flexor digitorum longus. Tendons underwent tensile loading to failure measuring cross-sectional area (CSA), maximum load, strain at failure, ultimate tensile strength, and elastic modulus. Results from 332 tendons were analyzed using mixed-effects linear regression, accounting for donor age, sex, height, and weight.
Mechanical properties were significantly different among tendons and were substantially greater than the effects of donor characteristics. Significant effects of donor sex, age, and height were limited to specific tendons: Achilles tendon, tibialis posterior, and tibialis anterior. All other tendons were unaffected. The Achilles tendon was most influenced by donor variables: greater CSA in men (β = 15.45 mm
; Šidák adjusted
< .0001), decreased maximum load with each year of increased age (β = -17.20 N per year; adjusted
= .0253), and increased CSA (β = 1.92 mm
per inch; adjusted
< .0001) and maximum load (β = 86.40 N per inch; adjusted
< .0001) with each inch of increased height.
Mechanical properties vary significantly across different human tendons. The effects of donor age, sex, and height are relatively small, are limited to specific tendons, and affect different tendons uniquely. The findings indicate that age negatively affected only the Achilles tendon (maximum load) and challenge the exclusion of donors aged >65 years across all tendon grafts.
The findings support including a broader range of tendons for use as allografts for anterior cruciate ligament reconstruction and reviewing the current exclusion criterion of donors aged >65 years. |
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AbstractList | The use of allograft tendons has increased for primary and revision anterior cruciate ligament reconstruction, but allograft supply is currently limited to a narrow range of tendons and donors up to the age of 65 years. Expanding the range of donors and tendons could help offset an increasing clinical demand.
To investigate the effects of donor age, sex, height, and specific tendon on the mechanical properties of a range of human lower leg tendons.
Descriptive laboratory study.
Nine tendons were retrieved from 39 fresh-frozen human cadaveric lower legs (35 donors [13 female, 22 male]; age, 49-99 years; height, 57-85 inches [145-216 cm]) including: Achilles tendon, tibialis posterior and anterior, fibularis longus and brevis, flexor and extensor hallucis longus, plantaris, and flexor digitorum longus. Tendons underwent tensile loading to failure measuring cross-sectional area (CSA), maximum load, strain at failure, ultimate tensile strength, and elastic modulus. Results from 332 tendons were analyzed using mixed-effects linear regression, accounting for donor age, sex, height, and weight.
Mechanical properties were significantly different among tendons and were substantially greater than the effects of donor characteristics. Significant effects of donor sex, age, and height were limited to specific tendons: Achilles tendon, tibialis posterior, and tibialis anterior. All other tendons were unaffected. The Achilles tendon was most influenced by donor variables: greater CSA in men (β = 15.45 mm
; Šidák adjusted
< .0001), decreased maximum load with each year of increased age (β = -17.20 N per year; adjusted
= .0253), and increased CSA (β = 1.92 mm
per inch; adjusted
< .0001) and maximum load (β = 86.40 N per inch; adjusted
< .0001) with each inch of increased height.
Mechanical properties vary significantly across different human tendons. The effects of donor age, sex, and height are relatively small, are limited to specific tendons, and affect different tendons uniquely. The findings indicate that age negatively affected only the Achilles tendon (maximum load) and challenge the exclusion of donors aged >65 years across all tendon grafts.
The findings support including a broader range of tendons for use as allografts for anterior cruciate ligament reconstruction and reviewing the current exclusion criterion of donors aged >65 years. |
Author | Hartnell, Nicholas Ashton, Dylan M Little, Christopher B Hefferan, Samantha A Clarke, Elizabeth C Blaker, Carina L Haubruck, Patrick |
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Keywords | reconstruction ACL musculoskeletal biomechanics of tendon graft tissue mechanics |
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SubjectTerms | Achilles Tendon Aged Aged, 80 and over Allografts Anterior Cruciate Ligament - surgery Anterior Cruciate Ligament Injuries - surgery Biomechanical Phenomena Female Humans Male Middle Aged |
Title | Challenging the Perceptions of Human Tendon Allografts: Influence of Donor Age, Sex, Height, and Tendon on Biomechanical Properties |
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