The Effects of Knee Injury on Muscle Activation
Knee ligament injury results in weakness of the musculature acting about the knee joint complex. This phenomenon has been termed arthrogenic muscle inhibition (AMI) and is defined as an ongoing reflex inhibition of musculature surrounding a joint following distension or damage to structures of that joint. AMI is the body’s innate response intended to protect the joint from further damage by discouraging its use. This protective mechanism comes at a high cost, as it restricts full muscle activation and therefore prevents restoration of strength possibly placing patients at greater risk for re-injury and potentially predisposing them to chronic degenerative joint conditions. Literature is available suggesting AMI is present following ACL injury and reconstruction, yet minimal data are available examining what factors impact the magnitude of the ensuing AMI following knee injury. In hopes of better understanding the factors that may result in persistent AMI, we plan to conduct an investigation to examine the impact of ACL graft type and the presence or absence of meniscal damage on the magnitude of quadriceps inhibition.