Three-dimensional Biomechanics of the Lower Limbs in Healthy Volunteers: Establishment of a Reference Database Using the MERItest® System

Anterior cruciate ligament (ACL) reconstruction is frequently associated with persistent biomechanical impairments despite clinically satisfactory recovery. The MERItest® is a standardized biomechanical assessment battery designed to evaluate movement strategies, muscle strength, and neuromuscular control during functional tasks. However, the clinical interpretation of these assessments is currently limited by the lack of normative data collected using a standardized protocol. This single-center, prospective interventional trial involving minimal risk, aims to establish a biomechanical reference database of healthy volunteers based on measurements obtained during the MERItest® assessment. The development of this normative database will enhance the interpretation of biomechanical outcomes in patients following ACL reconstruction by enabling direct comparison with a healthy reference population assessed under identical conditions.

Inclusion Criteria: * Asymptomatic with respect to the lower limbs at the time of inclusion * Regular participation in sports activities compatible with completion of the MERItest® (at least twice per week) * Ability to perform all tasks included in the study protocol, including running, jumping, single-leg landings, hop tests, and strength assessments Exclusion Criteria: * History of lower-limb surgery * History of anterior cruciate ligament (ACL) rupture or other major knee ligament injury * History of a lower-limb fracture resulting in functional impairment * History of symptomatic meniscal, cartilage, or tendon pathology affecting the lower limb * Current pain, functional limitation, or injury involving the spine, pelvis, or lower limbs * Any painful or traumatic event within the previous month that could affect test performance * History or presence of a neurological or vestibular disorder likely to impair motor control * Current use of medications that may affect physical or muscular performance (e.g., anti-inflammatory drugs, corticosteroids, muscle relaxants) * Medical contraindication to performing the exercises included in the study protocol * Inability to complete the entire MERItest® under standardized testing conditions