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Spinal mobility is one of the core outcome measures used in axial spondyloarthritis as recommended by the Assessment of SpondyloArthritis international Society (ASAS).1 ,2 Among the commonly used spinal mobility measures, lateral spinal flexion (LSF) is considered to be the most sensitive to change and has therefore been included as one of the domains in the ASAS 5/6 response criteria.3 ,4
LSF is measured as the difference between two marks placed on the thigh, one in a neutral standing position and the other in maximum lateral flexion.2 Alternatively, LSF can be calculated as the difference in the lateral distances between middle fingertip-to-floor (FTF) in the neutral position (neutral FTF) and middle FTF in maximum latero-flexion (maximum flexion FTF).2 In this second LSF measurement, it may sometimes erroneously and accidentally happen that …
Contributors All authors have contributed to this letter. SR prepared the first draft, and all authors reviewed it and agreed with it.
Competing interests None.
Ethics approval The Ethics Committee of Maastricht University Medical Center evaluated the project and considered that it did not require formal approval because it only involved healthy volunteers.
Provenance and peer review Not commissioned; externally peer reviewed.