Related Experiment Video
Updated: Jul 26, 2026

Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation
Published on: January 27, 2023
Validation and reliability of the Simple Achille Value (SAV) in Achilles tendon disorders
Pierre-Jean Lambrey1, Alexis Thiounn2, Ronny Lopes3
1Service de Chirurgie orthopédique et traumatologique, CHU de Lille, 2 avenue Emile Laine, 59000 Lille, France; Université Lille-Hauts de France, 59000 Lille, France.
Background:
Achilles tendon (AT) disorders significantly impact patient life, necessitating accurate assessment tools. Current methods are often complex and time-consuming. This study aims to validate the Simple Ankle Value (SAV) for AT disorders.
Methods:
A multicenter study was conducted involving 101 participants, including a surgical, a conservative, and a control group. Participants completed the SAV, VISA-A, and EFAS scores. The study assessed correlations among scores, reliability, responsiveness to change, threshold and ceiling effect and discriminative ability of the SAV.
Results:
There was a significant strong correlation with the EFAS and a significant moderate to strong correlation with the VISA-A. The score showed excellent reliability (ρ = 0.95, 95 %CI: [0.913; 0.976], p < 0.001). Responsiveness to change was significant between preoperative and postoperative SAV (37.99 ± 25.73 vs 70.86 ± 21.26). The SAV discriminated between patient and controls with no threshold or ceiling effect.
Conclusion:
The SAV provides a valid, reliable, and responsive method for assessing AT disorders. It offers a simplified and effective alternative to more complex scores.
Study Design:
Cohort study (Diagnosis); Level of evidence, 2.
Related Concept Videos
Reliability and Validity
Bioavailability Study Design: Healthy Subjects Versus Patients
Sensitivity, Specificity, and Predicted Value
Sensitivity is the...
Assumptions of Survival Analysis

