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CompletedNCT03401177Updated Jul 9, 2020

Treatment of Early Phase Achilles Tendinopathy - the Effect of NSAIDs

An interventional study of Naproxen 500 Mg and Placebo Oral Tablet in Tendon Injuries, Achilles Tendinopathy and Inflammation, sponsored by Bispebjerg Hospital. Completed at 1 site in Denmark. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2020-07-09.

Sponsored by Bispebjerg Hospital · Not applicable, Interventional, and Basic science

Phase
Not applicable
Study type
Interventional
Enrollment
70
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

this study evaluates the addition of initial short term NSAID treatment to physiotherapy prescribed exercise treatment in patient with early phase tendinopathy. Half of the participants will initially receive NSAID (naproxen) for 7 days, while the other half will receive a placebo, where after both groups will be subjected to 3 months heavy slow resistance training.

Read the detailed description

NSAID is effective in short term pain relief in musculoskeletal disorders, but little is known about the long-term effect in early phase tendinopathy, when used as a supplement to treatment as usual, namely heavy slow resistance training and training load reduction. In this study, NSAIDs will be used, which works through COX inhibition, which again inhibits Prostaglandins, in this way investigators attempt to dampen the initial inflammation and pronounced cell activity that is thought to be present in early phase tendinopathy. With this project, it will be attempted to investigate whether initial dampening adds to the effect achieved through heavy load resistance training, which is thought to stimulate structural repair and regeneration in the tendon, by applying appropriate load to the tendon tissue, thereby stimulating the tendon cells to repair and regeneration.

02

Conditions studied

  • Tendon Injuries
  • Achilles Tendinopathy
  • Inflammation
03

In context

Tendon Injuries

100 studies on the registry are indexed under Tendon Injuries; 27 are open to participants now.

This study's enrollment of 70 is above the median of 44 across 70 interventional studies indexed under Tendon Injuries.

Browse Tendon Injuries studies →

Lead sponsor

Bispebjerg Hospital is the lead sponsor of 289 studies on the registry; 29 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Activity related pain in the achilles tendon
  • Palpation pain in the achilles tendon
  • Onset of symptoms within the last 3 months

Exclusion criteria

Exclusion Criteria:

  • Previous injury in the achilles tendon on the ipsilateral side.
  • Recent infection around the achilles tendon
  • Previous surgery in the achilles tendon.
  • for NSAID treatment.
  • NSAID treatment for the current injury
  • Medication with NSAID interaction
Terms in these criteria, in plain language(1)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Contraindication

A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.

05

Study design

Phase
Not applicable
Primary purpose
Basic science
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Participant, Investigator, Outcomes assessor)
Enrollment
70 participants (actual)

Study arms

  • Experimental
    Naproxen & Heavy resistance training

    Naproxen: 500 mg x 2 daily for 7 days, HRT: 3 months physiotherapy guided training.

    Drug: Naproxen 500 Mg · Other: Heavy resistance training

  • Placebo comparator
    Placebo & Heavy resistance training

    Placebo oral tablet: pill manufactured to mimic naproxen tablet x 2 daily for 7 days, HRT: 3 months physiotherapy guided training.

    Drug: Placebo Oral Tablet · Other: Heavy resistance training

Interventions

  • Naproxen is used as a tool to dampen the inflammation thought to be present in early phase Tendinopathy

    Also known as: Naproxen-E Mylan

  • DrugPlacebo Oral Tablet

    Placebo is used, to provide a control to the active group.

    Also known as: Placebo

  • OtherHeavy resistance training

    Heavy slow resistance training - used in both groups subsequent to the initial week of NSAID or placebo treatment.

    Also known as: HRT

06

What researchers measure

Primary outcomes

  1. Victorian Institute of Sport Assessment - Achilles (VISA-A)

    Standardised score of functional capability, in patient with achilles tendinopathy. Total score will be reported; scale (0-100). 100=full functional capacity 0=poor functional capacity.

    Time frame: 0-3 months

Secondary outcomes

  1. Victorian Institute of Sport Assessment - Achilles (VISA-A)

    Standardised score of functional capability, in patient with achilles tendinopathy. Total score will be reported; scale (0-100). 100=full functional capacity 0=poor functional capacity.

    Time frame: 0-1 week; 0-12 months

  2. Weight

    Weight (kg)

    Time frame: 0-3 months

  3. Height

    Height (cm)

    Time frame: 0-3 months

  4. Magnetic Resonance Imaging (MRI) - scannings

    3 Tesla MRI scanning of the achilles tendon.

    Time frame: 0-3 months

  5. Ultrasonography -Power doppler

    For measuring tendon vascularisation, area with power doppler signal (cm\^2)

    Time frame: 0-1 week; 0-3 months

  6. Ultrasonography - Greyscale

    Greyscale ultrasound for measuring tendon thickness (mm)

    Time frame: 0-1 week; 0-3 months

  7. Questionnaires - activity (time consumption)

    Questions on physical activity: time consumption (hours/week) Hours of training/week; Hours of training applying load on the achilles tendon/week; Scale (continues)

    Time frame: 0-1 week; 0-3 months; 0-12 months

  8. Questionnaires - activity (number of sessions)

    Questions on physical activity: number of sessions/week Number of training sessions/week. Number of training sessions applying load on the achilles tendon/week; Scale (continues)

    Time frame: 0-1 week; 0-3 months; 0-12 months

  9. Questionnaires - activity (intensity)

    Questions on physical activity intensity: time consumption for strenuous activity (hours/week).

    Time frame: 0-1 week; 0-3 months; 0-12 months

  10. Questionnaires - Numerical Rating Scale (NRS) - Pain

    Questions on pain, both during activity and during rest. Pain during activity, (NRS); Scale (0-10) Pain after activity, (NRS); Scale (0-10) Pain at rest, (NRS); Scale (0-10) Pain I the morning, (NRS); Scale (0-10) Maximal pain during the past week, (NRS); Scale (0-10)

    Time frame: 0-1 week; 0-3 months; 0-12 months

07

Study locations

1 site
  • Bispebjerg Hospital
    Copenhagen, NV 2400, Denmark
08

References and documents

Publications

  • Malmgaard-Clausen NM, Jorgensen OH, Hoffner R, Andersen PEB, Svensson RB, Hansen P, Nybing JD, Magnusson SP, Kjaer M. No Additive Clinical or Physiological Effects of Short-term Anti-inflammatory Treatment to Physical Rehabilitation in the Early Phase of Human Achilles Tendinopathy: A Randomized Controlled Trial. Am J Sports Med. 2021 Jun;49(7):1711-1720. doi: 10.1177/0363546521991903. Epub 2021 Mar 15. PubMed 33719579 ↗

Individual participant data

Plan to share: Undecided

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 9, 2020, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT03401177
Responsible party
Nikolaj Mølkjær Malmgaard-Clausen (Medical Doctor, Bispebjerg Hospital) — Principal investigator
First posted
Jan 17, 2018
Start date
Jan 15, 2018
Primary completion
Jul 31, 2019
Completion
Apr 27, 2020
Last update
Jul 9, 2020

Study contacts

Michael Kjær, Professor
study director · Institute of Sports Medicine, Copenhagen

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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Studies of the drug tested here: Naproxen

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