ACL Reconstruction
Conditions
Keywords
ACL rupture, ACL reconstruction, Return to sport, ACL tear, Dynamometry
Brief summary
Injuries to the anterior cruciate ligament are common and are usually treated with reconstruction and subsequent rehabilitation. Many people succeed in return to sport (RTS), but not to the original level. Muscle strength factors can be assessed using isokinetic strength measurements, while the psychological readiness to return to sport can be assessed using the Anterior Cruciate Ligament-Return to Sport after Injury (ACL-RSI) questionnaire. In this study, isokinetic strength testing and psychological testing with the ACL-RSI questionnaire 1 to 4 years after ACL reconstruction will be assessed. The study will be conducted at the Institute of Physical Medicine & Rehabilitation at the Kepler University Hospital. The Biodex System Pro™, a medical device for measuring and training muscle strength, will be used for the isokinetic measurements. The research question is as follows: Is there a correlation between the results of the ACL RSI questionnaire and the results of isokinetic strength testing on the Biodex System 4 Pro™ in test subjects following ACL reconstruction?
Interventions
None listed
Sponsors
Johannes Kepler University of Linz
University of Salzburg
Study design
Observational model
OTHER
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
No
Inclusion criteria
* Primary unilateral ACL reconstruction 1 to 4 years prior testing * Physically active * 18-50 years * Medical approval for maximum loads
Exclusion criteria
* Bilateral Knee injury * Pregnancy * Acute pain (VAS ≥ 3) * Extremely limited mobility * Extreme joint instability * Acute injuries * Inflammation * Fever
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Peak torque (Nm) - Isokinetic dynamometry (Biodex System 4) | Day 1 (1 to 4 years after ACL reconstruction) | The isokinetic dynamometer measures concentric strength in extension and flexion. Isokinetic strength testing at a ROM (range of motion) of 0-90° knee flexion at 3 different speeds. Test protocol at angular velocities of 60°/sec, 180°/sec and 240°/sec. |
| ACL-RSI questionnaire (Anterior Cruciate Ligament-Return to Sport after Injury) | Day 1 (1 to 4 years after ACL reconstruction) | The ACL-RSI is a measure of psychological readiness to return to sport. It contains 12 questions and examines 3 components related to readiness to return to sport: emotions (5 questions), confidence in one's own performance (5 questions) and risk assessment (2 questions). The questions relate to the psychological effects of returning to sport. The respondents answer each question by giving their assessment in steps of ten on a Likert scale from 0 to 100 points. Low scores indicate a negative psychological assessment and high scores indicate a positive psychological assessment. The cut-off value for distinguishing between returnees and non-returnees is 51.3 points. A German version of the questionnaire is used. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Isokinetic dynamometry (Biodex System 4) | Day 1 (1 to 4 years after ACL reconstruction) | The isokinetic dynamometer measures concentric strength in extension and flexion including following parameters: Average peak torque (Nm), time to peak torque (sec), angle of peak torque (deg), torque at 30°, torque at 0.18 seconds, max. repetitions to total work, work/body weight, total work, work first third, work last third, work fatique, avg. power, acceleration time (msec), ROM (range of motion, deg), agonist/antagonist ratio (%), hamstring/quadriceps (H/Q) ratio, LSI (limb symmetry index) Isokinetic strength testing at a ROM of 0-90° knee flexion at 3 different speeds. Test protocol at angular velocities of 60°/sec, 180°/sec and 240°/sec. |
| Sports activity | Day 1 | Sports activity before and after surgery in minutes/week |
Countries
Austria
Outcome results
None listed