2023 ISAKOS Biennial Congress ePoster
Reliability of a New Device to Measure Anterior Knee Laxity in Outpatient Setting
Marcello Motta, MD, Brescia ITALY
Marco Adriani, MD, Brescia, Brescia ITALY
Francesco De Filippo, MD, Brescia, Brescia ITALY
Alessandro Colosio, MD, Brescia ITALY
Maristella Francesca Saccomanno, MD, PhD, Brescia ITALY
Giuseppe Milano, Prof., Brescia, BS ITALY
University of Brescia, Brescia, Brescia, ITALY
FDA Status Not Applicable
Summary
Arthrometers have become increasingly popular for objective assessments of anterior knee laxity, The purpose of the present study was to evaluate the intra and inter-rater reliability of a new arthrometer (BLU-DAT, FGP, Dossobuono, Verona, Italy) for the measurement of anterior tibial translation (ATT) in outpatient setting
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Abstract
Background
Arthrometers have become increasingly popular for objective assessments of anterior knee laxity. A broad variety of knee arthrometers is available, however their reliability is still controversial. The purpose of the present study was to evaluate the intra and inter-rater reliability of a new arthrometer (BLU-DAT, FGP, Dossobuono, Verona, Italy) for the measurement of anterior tibial translation (ATT) in outpatient setting.
Methods
A reliability study was conducted. All patients affected by an anterior cruciate ligament (ACL) injury confirmed by magnetic resonance imaging (MRI) were included. Exclusion criteria were: bilateral ACL injuries and/or previous contralateral ACL reconstructions. Three examiners (one orthopedic surgeon fellowship trained in knee surgery and two orthopedic residents) performed a Lachman test by using a new testing device (BLUDAT; FGP srl, Dossobuono, VR, Italy) to measure ATT. Each examiner applied three different loads: 7 Kg (69 N), 9 Kg (88 N) and maximum manual traction (MMT) on the affected and contralateral knee. Every test was repeated three times by each examiner. Mean side-to-side difference in ATT was calculated. A second set of measures was repeated after 2 weeks by one examiner to assess intra-rater reliability. Intraclass Correlation Coefficients (ICCs) were calculated using a two-way random effect model and evaluation of absolute agreement. Confidence intervals (CI) were calculated at 95% confidence level for reliability coefficients. Reliability values range from 0 (no agreement) to 1 (maximum agreement).
Results
The study included 39 patients. Inter-observer reliability showed a good agreement only for MMT (ICC=0.75, 95% CI = 0.57 – 0.86); while intra-observer reliability showed a good agreement for 7 kg (ICC=0.75, 95% CI = 0.52–0.87) and MMT (ICC=0.78, 95% CI = 0.58 – 0.88). All other measurements showed only a moderate agreement.
Conclusion
The BLU-DAT testing device has a good inter-rater and intra-rater reliability at MMT.