Different gait pattern in adolescence with patellofemoral instability.

Area of Science:

• Orthopedics
• Biomechanics
• Pediatric Sports Medicine

Background:

• Recurrent patellofemoral instability significantly impacts adolescent gait and activity levels.
• Understanding the biomechanical adaptations in gait for patellofemoral instability is crucial but understudied.
• The relationship between gait alterations and radiological findings in this population requires further investigation.

Purpose of the Study:

• To investigate gait biomechanics in adolescents with recurrent patellofemoral instability.
• To explore potential correlations between observed gait patterns and radiological parameters.
• To identify distinct gait coping strategies and their clinical relevance.

Main Methods:

• Retrospective analysis of gait kinematic and kinetic data from 32 adolescents (12-18 years) with unilateral patellofemoral instability.
• Grouping subjects based on sagittal knee moments during loading response and mid-stance phases.
• Utilizing one-way ANOVA for kinematic/kinetic differences and logistic regression for gait-radiological parameter relationships, including MRI and X-ray data.

Main Results:

• Three distinct gait patterns were identified, characterized by variations in knee flexion during loading response and single stance.
• The 'patella-unloading' group exhibited near-extended knees, while the 'patella-overloading' group showed increased knee flexion.
• No significant relationship was found between gait biomechanics and any of the assessed radiological parameters (MRI, X-ray).

Conclusions:

• Adolescents with patellofemoral instability develop varied gait strategies to manage knee joint loading.
• Observed gait adaptations in knee kinematics are not directly associated with underlying skeletal morphology or radiological findings.
• These findings highlight the clinical relevance of identifying specific gait patterns in managing adolescent patellofemoral instability.