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The purpose of this project is to investigate if the magnitude of a loading based 12 weeks rehabilitation regime for patellar tendinopathy influence the clinical outcome, tendon structure and function.
The investigators hypothesize that a greater magnitude (90% of 1RM) of loading will yield a more positive clinical outcome, tendon structure and function in patients with patellar tendinopathy compared to a lower magnitude of loading (55% of 1 RM) when total exercise volume is equal in both groups.
Randomized controlled intervention study with one year follow-up
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Heavy slow resistance group | Active Comparator | Heavy slow resistance training. Three times weekly for 12 weeks. |
|
| Moderate slow resistance group | Experimental | Moderate slow resistance training. Three times weekly for 12 weeks. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Heavy slow resistance training | Other | Resistance training for knee extensors. The exercise will be performed at 90% of 1 RM and slowly (6 s/repetition). |
|
| Measure | Description | Time Frame |
|---|---|---|
| Change from baseline Victorian Institute of Sports Assessment - Patella Questionnaire (VISA-P) at 12 wks | Patient reported outcome regarding symptoms, function and the ability to participate in sports | 0-12 wks |
| Measure | Description | Time Frame |
|---|---|---|
| Victorian Institute of Sports Assessment - Patella Questionnaire (VISA-P) | Patient reported outcome regarding symptoms, function and the ability to | 0 and 6 wks + 1 yr follow up + Long-term follow-up (2-4 yr) |
| Pain rating on numeric rating scale (NRS) and activity level of sporting activities (h/wk) |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Peter Magnusson, Professor | Bispebjerg Hospital, University of Copenhagen | Study Director |
| Anne-Sofie Agergaard, Phd.Student | Bispebjerg Hospital | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Department of Physical and Occupational Therapy / Institute of Sports Medicine Copenhagen, Bispebjerg Hospital | Copenhagen | 2400 | Denmark |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 33616456 | Derived | Agergaard AS, Svensson RB, Malmgaard-Clausen NM, Couppe C, Hjortshoej MH, Doessing S, Kjaer M, Magnusson SP. Clinical Outcomes, Structure, and Function Improve With Both Heavy and Moderate Loads in the Treatment of Patellar Tendinopathy: A Randomized Clinical Trial. Am J Sports Med. 2021 Mar;49(4):982-993. doi: 10.1177/0363546520988741. Epub 2021 Feb 22. |
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| Moderate slow resistance training | Other | Resistance training for knee extensors. The exercise will be performed at 55% of 1 RM and slowly (6 s/repetition). |
|
Questionnaire |
| 0,6,12 wks + 1 yr follow up + Long-term follow-up (2-4 yr) |
| Tendon thickness and Doppler activity | Measured by ultrasound | 0,6,12 wks + 1 yr follow up + Long-term follow-up (2-4 yr) |
| Single-leg decline squat (SLDS) test | A reliable patellar tendon pain provocation test, will be used to assess pain during function | 0,6, 12 wks + 1 yr follow up + Long-term follow-up (2-4 yr) |
| Jump test | Squat jump and Counter movement Jump will be used to assess patellar tendinopathy caused functional deficits on the injured site compared with the non-injured site | 0 and 12 wks |
| Mechanical properties | Synchronized tendon elongation with the use of ultrasonography along with force measures, will be used during voluntary contractions to determine mechanical properties | 0 and 12 wks |
| Muscle strength | Maximal muscle strength of the knee extensors is obtained during a maximal voluntary contractions | 0 and 12 wks |
| Tendon dimensions and structure | Measured by MRI | 0 and 12 wks |
| Treatment satisfaction | Questionnaire | 12 wks + 1 yr follow-up + Long-term follow-up (2-4 yr) |