Patellar Tendinopathy, Jumper's Knee
Conditions
Brief summary
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.
Detailed description
Randomized controlled intervention study with one year follow-up
Interventions
Resistance training for knee extensors. The exercise will be performed at 90% of 1 RM and slowly (6 s/repetition).
OTHERModerate slow resistance training
Resistance training for knee extensors. The exercise will be performed at 55% of 1 RM and slowly (6 s/repetition).
Sponsors
Bispebjerg Hospital
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
MALE
Age
20 Years to 45 Years
Healthy volunteers
No
Inclusion criteria
* Uni- or bilateral patellar tendinopathy * Symptoms \> 3 months * Ultrasonographical tendon swelling * Ultrasonographical hypo-echoic area with doppler * BMI 18.5-30
Exclusion criteria
* Patellar tendinopathy \> 12 month * Previous knee surgery * Confounding diagnosis to the knee joint * Diabetes or arthritis * Previous corticosteroid injection for patellar tendinopathy * Smoking * Being elite volleyball players
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change from baseline Victorian Institute of Sports Assessment - Patella Questionnaire (VISA-P) at 12 wks | 0-12 wks | Patient reported outcome regarding symptoms, function and the ability to participate in sports |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Pain rating on numeric rating scale (NRS) and activity level of sporting activities (h/wk) | 0,6,12 wks + 1 yr follow up + Long-term follow-up (2-4 yr) | Questionnaire |
| Tendon thickness and Doppler activity | 0,6,12 wks + 1 yr follow up + Long-term follow-up (2-4 yr) | Measured by ultrasound |
| Single-leg decline squat (SLDS) test | 0,6, 12 wks + 1 yr follow up + Long-term follow-up (2-4 yr) | A reliable patellar tendon pain provocation test, will be used to assess pain during function |
| Jump test | 0 and 12 wks | 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 |
| Victorian Institute of Sports Assessment - Patella Questionnaire (VISA-P) | 0 and 6 wks + 1 yr follow up + Long-term follow-up (2-4 yr) | Patient reported outcome regarding symptoms, function and the ability to |
| Muscle strength | 0 and 12 wks | Maximal muscle strength of the knee extensors is obtained during a maximal voluntary contractions |
| Tendon dimensions and structure | 0 and 12 wks | Measured by MRI |
| Treatment satisfaction | 12 wks + 1 yr follow-up + Long-term follow-up (2-4 yr) | Questionnaire |
| Mechanical properties | 0 and 12 wks | Synchronized tendon elongation with the use of ultrasonography along with force measures, will be used during voluntary contractions to determine mechanical properties |
Countries
Denmark
Outcome results
None listed