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Completed

NCT Number: NCT04650997

The Mechanical,Physiological and Therapeutic Effects of Eccentric Exercise Combined With Extracorporeal Shockwave Therapy in Athletes With Patellar Tendinopathy

Patellar tendinopathy is one of the most common injuries in jumping athletes. Changes in mechanical and physiological properties of tendon are the two proposed forms of pathogenesis. The efficacy of eccentric exercise when applied alone and combined with extrocoporeal shockwave therapy had been reported; however, the underlying treatment mechanisms of pain and dysfunction are not clear. This project aimed to explore the mechanical, physiological and therapeutic effects of eccentric exercise when applied as a single treatment and as an adjunct to extracorporeal shockwave therapy.

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Key information

Conditions

Patellar Tendinopathy

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Competitive athletes
  • Pain at the inferior pole of the patella with training for at least 3 months
  • Tenderness at the inferior pole of the patella on palpation

Exclusion criteria

  • Patellofemoral pain syndrome, fat pad irritations, meniscus injury, osteoarthritis, rheumatoid arthritis or infections
  • History of fracture over lower limbs and inflammatory myopathies
  • Cortisone injuection and other interventions within 3 months
  • Contraindication to extracorporeal shockwave therapy

Treatment and study plan

Eccentric exercise

Behavioral

Knee eccentric exercise with sham or focused extrocorporeal shockwave therapy for 12 weeks

Other names: Extracoporeal shockwave therapy (Minilith SL1, Storz Medical)

Primary outcomes

  1. Tendon stress in pascals at baseline

    Time frame: Before intervention

    Tendon stress measured by ultrasonography and dynamometry

  2. Change of tendon stress in pascals at 12 weeks

    Time frame: 12 weeks

    Tendon stress measured by ultrasonography and dynamometry

  3. Change of tendon stress in pascals at 16 weeks

    Time frame: 16 weeks

    Tendon stress measured by ultrasonography and dynamometry

  4. Tendon vascularity index as percentage at baseline

    Time frame: Before intervention

    Tendon vascularity measured by power doppler ultrasonography

  5. Change of tendon vascularity index as percentage at 12 weeks

    Time frame: 12 weeks

    Tendon vascularity measured by power doppler ultrasonography

  6. Change of tendon vascularity index as percentage at 16 weeks

    Time frame: 16 weeks

    Tendon vascularity measured by power doppler ultrasonography

Secondary outcomes

  1. Tendon related pain on visual analogy scale at baseline

    Time frame: Before intervention

    Maximal intensity of self-perceived pain in the past 7 days, pain during single-leg declined-squat test

  2. Change of tendon related pain on visual analogy scale at 12 weeks

    Time frame: 12 weeks

    Maximal intensity of self-perceived pain in the past 7 days, pain during single-leg declined-squat test

  3. Change of tendon related pain on visual analogy scale at 16 weeks

    Time frame: 16 weeks

    Maximal intensity of self-perceived pain in the past 7 days, pain during single-leg declined-squat test

  4. Tendon related dysfunction by questionnaire at baseline

    Time frame: Before intervention

    Victorian Institute of Sport Assessment Questionnaire - Patellar Tendon

  5. Change of tendon related dysfunction by questionnaire at 12 weeks

    Time frame: 12 weeks

    Victorian Institute of Sport Assessment Questionnaire - Patellar Tendon

  6. Change of tendon related dysfunction by questionnaire at 16 weeks

    Time frame: 16 weeks

    Victorian Institute of Sport Assessment Questionnaire - Patellar Tendon

Sponsors and collaborators

Lead sponsor

The Hong Kong Polytechnic University

Other

Registry information

Important dates

Study start
2011
Primary completion
2014
Study completion
2014
First posted
Dec 3, 2020
Registry last updated
Dec 3, 2020

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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