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Accelerometry-derived physical activity following Achilles tendon rupture: A prospective cohort study.

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Related Experiment Video

Updated: Apr 2, 2026

Author Spotlight: Effectiveness of Extracorporeal Shockwave Therapy in Achilles Tendinopathy Treatment
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Achilles Tendon Shear Wave Velocity Within a 1-Year Follow-Up After Non-Operatively Treated Rupture.

Maria Sukanen1, Ra'ad M Khair1, Iida Laatikainen-Raussi1

  • 1Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|April 1, 2026
PubMed
Summary
This summary is machine-generated.

Achilles tendon (AT) shear wave velocity (SWV) recovery after rupture shows improved material properties by 6 months. Increased AT SWV by 12 months correlates with better force generation and function.

Keywords:
daily step countdiagnostic imagingelastographymechanical propertiesmuscle strengthpatient functiontendon healingultrasound

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Area of Science:

  • Biomechanics
  • Musculoskeletal injuries
  • Medical imaging

Background:

  • Achilles tendon rupture is a common injury impacting mobility.
  • Understanding tendon healing and recovery is crucial for rehabilitation.
  • Shear wave velocity (SWV) offers a non-invasive method to assess tendon mechanical properties.

Purpose of the Study:

  • To track changes in Achilles tendon (AT) shear wave velocity (SWV) in the first year post-rupture.
  • To investigate the relationship between AT SWV and functional outcomes like torque, daily steps, and patient-reported function.
  • To assess changes in tendon thickness and correlate them with SWV and functional recovery.

Main Methods:

  • 27 participants (27 total, 8 female, 41.5 ± 9.8 years) were monitored for AT SWV, daily steps, and tendon thickness at 2, 6, and 12 months post-rupture.
  • SWV was measured at distal, middle, and proximal tendon locations. Plantarflexion maximal voluntary torque (MVT) was tested at 6 and 12 months.
  • Pearson's correlation and linear mixed models analyzed relationships between SWV, MVT, steps, function (ATRS), and tendon thickness.

Main Results:

  • Achilles tendon SWV limb symmetry index (LSI) correlated significantly with MVT LSI at 6 and 12 months post-rupture.
  • By 6 months, the injured tendon's SWV approached that of the uninjured limb.
  • At 12 months, the injured ATprox SWV was significantly higher than the uninjured side (p=0.007), with a median ATRS of 91 points.

Conclusions:

  • Increased AT SWV during recovery suggests improved material properties of the ruptured tendon.
  • This enhancement in mechanical properties likely contributes to improved load transfer and force generation capacity.
  • SWV monitoring can provide valuable insights into Achilles tendon healing and functional recovery post-rupture.