Introduction: The purpose of this study was to compare two different modes of administration (telephone versus face to face) for Lysholm knee score (LKS) to test their multi-mode equivalence and reliability.
Materials and methods: Two LKSs were obtained in 100 patients who underwent ACL reconstruction surgery. First LKS was completed through telephone interview, and second LKS, which was at least 2 weeks later, was completed face-to-face interview at the hospital. To analyze the test-retest reliability, the relative level of agreement between the two modes of administration for LKS was calculated using interclass correlation coefficient (ICC) in 95 % confidence interval.
Results: The mean LKS was 93.01 ± 9.12 (range 59-100) at telephone interview and 93.56 ± 7.93 (range 59-100) at face-to-face interview (p = 0.130). Both the total point and the each item's point were statistically similar (p < 0.05 for each item). The total score was same in 66 (66 %) subjects. The mean difference between two scoring was only 1.83 ± 3.14 points (range 0-15). However, eight (8 %) patients were assigned to different grading groups (excellent, good, fair, and poor). The overall LKS and the each item of the LKS had acceptable test-retest reliability [ICC = 0.954 (95 % CI 0.931-0.969)].
Conclusions: LKS can be reliably completed through telephone interview, which would provide accurate data similar to face-to-face interview. Researchers can design studies using telephone interview as a mode of administration for LKS or use mix-mode designs.