Assessment of Electromyographic Activity in the Quadriceps and Hamstrings of the Operated Limb Versus the Unaffected Limb in Patients Who Have Undergone ACL Surgery, With and Without Post-operative AMI - an Exploratory Study

An ACL tear and reconstruction can lead to a neurophysiological dysfunction commonly known as 'arthrogenic muscle inhibition' (AMI). This phenomenon impairs the ability to voluntarily activate the quadriceps, despite the anatomical integrity of the nerve and muscle structures responsible for contraction.

AMI is responsible for the quadriceps deficits observed following an ACL rupture and thus appears to be a major limiting factor in the patient's rehabilitation and functional recovery. Consequently, its diagnosis and treatment are imperative. The diagnosis of AMI (post-rupture and post-operative) is based on a classification system that categorises AMI diagnoses according to the identification of a deficit in activation of the vastus medialis (VM) alone (grade 1) or in combination with an extension deficit due to a grade 2 hamstring contracture (grade 2) (Sonnery-Cottet et al, 2022).

During the clinical examination, normal VM contraction (during relaxation) can be achieved without the recruitment of all motor units (minimal VM activation), and full knee extension (i.e. without reflex contraction of the hamstrings) can be restored without a return to adequate hamstring activation for the required task. Deficits in activation (inadequate activation) of the quadriceps and over-activation of the hamstrings (Hamstrings) during movements involving greater forces could be the consequences of an AMI still present in the early months of rehabilitation. This AMI could then disrupt the electromyographic (EMG) activation patterns of the quadriceps and hamstrings and contribute to long-term quadriceps deficits.

In this context, it is of interest to assess, during the rehabilitation phase, the EMG activity of the different muscle heads of the quadriceps and hamstrings in the operated limb versus the healthy limb in patients who have undergone ACL surgery and experienced post-operative IMA, and in patients who have undergone ACL surgery without post-operative IMA.

No studies have been published on this topic. This is why this research has been initiated.

Inclusion criteria

• Patient who has undergone ACL surgery at least 3 weeks ago
• Patient with no severe knee inflammation: stroke test ≤ 1+ and pain ≤ 3/10 (EN) at rest
• Patient with a Tegner score ≥ 5
• Patient with a Marx score ≥ 8
• Patient with or without a diagnosis of subjective AMI (Sonnery-Cottet et al. classification)
• French-speaking patients who do not object to the use of their data

Exclusion criteria

• Patient with a previous injury or surgery to the same or opposite knee
• Patient with a multi-ligament injury
• Patient with an AMI > grade 2b (Sonnery-Cottet et al. classification)
• Patient with a BMI > 30
• Pregnant or breastfeeding woman
• Patient with previous or current neurological and cardiovascular disorders or diseases
• Patient under legal protection: adult under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision