or Jumpersknee Patellar Tendinopathy
Conditions
Interventions
The intervention consists of a nutritional supplement with 10g hydrolysed
collagen and 40 mg vitamin C, in comparison to a placebo supplement consisting
of maltodextrin. All participants in both gro
Sponsors
Ziekenhuisvoorzieningen Gelderse Vallei
Eligibility
Age
16 Years to 64 Years
Inclusion criteria
Inclusion criteria: - Signed informed consent. - Age 16 - 40 years old - History of focal knee pain in patellar tendon or its patellar or tibial insertion in association with training and/or competition. - Current symptom duration of at least 12 weeks. - Sports participation at least once a week for at least one year. - Palpation tenderness to the corresponding painful area on the patellar tendon. - Focal patellar tendon pain during patellar tendon loading pain provocation test (single leg decline squat and/or single leg jump squat) - Victorian Institute of Sports Assessment (VISA-P) score
Exclusion criteria
Exclusion criteria: - Known presence of inflammatory joint diseases (e.g. spondylarthropathy, gout or rheumatoid arthritis) or familial hypercholesterolaemia. - Signs or symptoms of other coexisting knee pathology on physical examination (such as joint effusion and joint line tenderness) or additional diagnostics (Chondral lesion of the patella or trochlea on MRI or prepatellar bursitis on US). - Daily use of drugs with a putative effect on the patellar tendon in the preceding year (e.g. fluoroquinolones and statins). - Having had a patellar tendon surgery. - Having had a knee surgery without full recovery. - Previous patellar tendon rupture of the index knee. - Local injection therapy with corticosteroids, other drugs, blood, platelet rich plasma or stem cells in the preceding 12 months. - Acute knee or patellar tendon injuries (other than PT). - Participation in other concomitant treatment programs. - Participation in other research projects during participation of the JUMPFOOD study. - Already using (hydrolysed) collagen supplementation. - Giving blood donation in a period of two months prior to each test day. - Being pregnant or wish to become pregnant in the upcoming year. - Alcohol consumption for men >21 units/week and >4/day; for women >14 units/week and >3/day. - Abuse of hard drugs.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The primary outcome measure is the change over time in the Dutch version of the VISA-P score. This simple, validated, reliable and injury-specific questionnaire assesses the severity of patellar tendinopathy and is sensitive to small changes in symptoms. It is specifically designed for patellar tendinopathy, assessing pain, symptoms, simple function test and ability to participate in tendon-loading sports [1]. A VISA-P score of 100 indicates no pain, maximum function and maximum ability to participate in sports. The score decreases with increasing severity of PT symptoms. The VISA-P questionnaire will be administered at baseline and after 24 weeks of follow-up. The primary outcome measure is the difference between intervention and placebo in difference score between t=24 and t=0. | — |
Secondary
| Measure | Time frame |
|---|---|
| Secondary outcomes will include: Pain during functional tests, advanced imaging methods and tendon structure and stiffness measurements (ultrasound, UTC, Myoton), blood levels of amino acids and inflammatory markers measured in blood, and dietary habits, that will all be measured at baseline, at 12 weeks and at 24 weeks of follow-up. In addition, data on the compliance with the exercise program and supplement intake, training and competition load will be collected weekly using an online questionnaire. | — |
Countries
Netherlands
Outcome results
None listed