(English) Episode 211-Knee Stiffness Is a Brain Problem

This research article examines Arthrogenic Muscle Inhibition (AMI), a central reflex mechanism that often causes postoperative knee stiffness following ligament reconstruction. The authors explain that AMI results from neural impairment where the brain inhibits the quadriceps while overactivating the hamstrings, leading to a persistent flexion contracture. To assist clinicians, the study introduces a four-grade classification system to identify the severity of motor inhibition and extension deficits. The text emphasizes that traditional physical therapy and electrostimulation are often insufficient, necessitating specific neuromuscular exercises and joint aspiration. Ultimately, the sources advocate for resolving AMI through targeted preconditioning before proceeding with any surgical intervention. These findings suggest that knee injuries should be treated as neurophysiological dysfunctions rather than simple mechanical tears.(Sonnery-Cottet B, Ripoll T, Cavaignac E. Prévention de la raideur du genou après reconstruction ligamentaire : rôle de l’inhibition musculaire arthrogénique (IMA). Orthop Traumatol Surg Res [Internet]. 2024 ;110(1S) :103784. Disponible sur : http://dx.doi.org/10.1016/j.otsr.2023.103784)