The Mobil-AiderTM: An Innovative Orthopedic Device to Quantify Joint Mobility-Laxity

D.T. Gulick
Therapeutic Articulations, LLC, United States

Keywords: joint laxity, sprains, joint assessment

Background: Millions of musculoskeletal injuries occur each year. Assessing joint mobility is an important component of determining the magnitude of an injury. Skilled clinicians have good intra-clinician reliability but poor-moderate reliability between clinicians. The Mobil-Aider is a new device designed to quantify joint assessment. Purpose: Assess reliability/validity of the Mobil-Aider Methods: Zeiss microscope was used as the gold standard to assess the ability of the Mobil-Aider to measure linear translation. Sixty blinded measures were taken. Radiographs assessed linear translation of the knee. Results: ICC and Pearson correlation was 0.986, indicating a strong correlation between measures. Cronbach alpha reliability was 0.992. Independent one-sample t-tests were performed on the differences between the Mobil-Aider and Zeiss values (p=0.42), indicating the measures were not statistically different. Bland Altman plot and a linear regression revealed no proportional bias. Radiographic images revealed a 6.9mm anterior tibial translation on the femur. The LED reading on the Mobil-Aider was 7.1mm (