Patellar Tendinopathy - The Effect of Load Magnitude in Exercise-based Treatment

Bispebjerg Hospital44 enrolled

Overview

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

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Enrollment

Conditions

Patellar Tendinopathy Jumper's Knee

Interventions

Heavy slow resistance trainingOTHER

Resistance training for knee extensors. The exercise will be performed at 90% of 1 RM and slowly (6 s/repetition).

Moderate slow resistance trainingOTHER

Resistance training for knee extensors. The exercise will be performed at 55% of 1 RM and slowly (6 s/repetition).

Eligibility

Sex: MALEMin age: 20 YearsMax age: 45 Years

Medical Language ↔ Plain English

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

Locations (1)

Department of Physical and Occupational Therapy / Institute of Sports Medicine Copenhagen, Bispebjerg Hospital

Copenhagen, Denmark

Outcomes

Primary Outcomes

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

Time frame: 0-12 wks

Secondary Outcomes

Victorian Institute of Sports Assessment - Patella Questionnaire (VISA-P)

Patient reported outcome regarding symptoms, function and the ability to

Time frame: 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)

Questionnaire

Time frame: 0,6,12 wks + 1 yr follow up + Long-term follow-up (2-4 yr)

Tendon thickness and Doppler activity

Measured by ultrasound

Time frame: 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

Time frame: 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

Time frame: 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

Data from ClinicalTrials.gov

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