Activation Failure of Knee Extensors After Anterior Cruciate Ligament Rupture Depending on the Contraction Mode
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: ACL - Anterior Cruciate Ligament Rupture, Activation Failure, Contraction Mode. Basic parameters: 18 years — 50 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Center list to be confirmed — check the primary protocol.
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Overview
The primary objective of the study is to evaluate the impact of ACL injury and ACL reconstruction on voluntary activation during maximal voluntary contraction (measured by neurophysiological parameters) according to the contraction mode. The goal is to provide elements of knowledge to clinicians about the mechanisms of the activation failure depending on contraction mode, but also the resulting adapted clinical recommendations for conducting rehabilitation, and particularly for the use of different contraction modes. The main hypothesis is that activation failure is not equal according to the contraction mode during maximal voluntary contractions and neurophysiological parameters will be decreased in comparison with non-injured subjects. Secondary objectives are: * To analyze the evolution of neurophysiological parameters between sessions interspaced by several months according to the contraction mode. * To observe this time evolution depending on the treatment strategy chosen: rehabilitation or surgery plus rehabilitation.
Primary outcome measures
- Voluntary Activation Level [Time frame: Between 2 and 6 weeks after ACL rupture]
Secondary outcome measures (5)
- Maximal voluntary torque [Time frame: between 2 to 6 weeks after ACL rupture]
- EMG activity of vastus lateralis, vastus medialis and rectus femoris [Time frame: between 2 to 6 weeks after ACL rupture]
- Voluntary Activation Level [Time frame: Around 9 months after ACL rupture]
- Maximal voluntary torque [Time frame: Around 9 months after ACL rupture]
- EMG activity of vastus lateralis, vastus medialis and rectus femoris [Time frame: Around 9 months after ACL rupture]
Eligibility criteria
Inclusion criteria
A. ACL-injured groups (surgically or conservatively treated):
- Age between 18 and 50 years
- Free, informed consent signed by the participant and the investigator.
- Session 1: Delay of 2 to 6 weeks after injury, with a quiet knee (range of motion 110- 0°, minimal effusion, maximal contraction pain ≤ 2/10)
- Session 2: Duration of 36 to 42 weeks after injury, with a quiet knee (range of motion 110-0°, minimal effusion, maximal contraction pain ≤ 2/10)
- Independent person (Unprotected: under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision)
B. ControlGroup:
- Age between 18 and 50 years
- Free, informed consent signed by the participant and the investigator.
- Sport practitioners: at least once per week practicing activities like collective sports, racket sports, combat sports, skiing, or on-loading activities with changing of directions.
- Independent person (Unprotected: under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision)
Exclusion criteria
- 1\. Subjects fitted with an implanted electronic device such as a cardiac pacemaker 2. Professional athlete 3. Pregnant women 4. Subject with systemic pathology or treatment affecting the musculoskeletal system 5. Subject with a history of neurological pathology or traumatic pathology, or pathology that required orthopedic treatment and/or surgery of the knee, hip and/or lumbar spine 6. Contraindication to isokinetic testing: incapacitating pain, evolving pathological process, non- healed fracture, unbalanced cardiovascular pathology (angina pectoris, arterial hypertension) 7. Contralateral knee injury 8. Subject inability to follow procedures or insufficient knowledge of project language 9. Data acquisition issue or injury during testing
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Case-control
Study locations
Center list to be confirmed — check the primary protocol.
Identifiers
NCT: NCT06783062 · 2024-01580