The SEFAS has been validated and shown to have good reliability and validity for assessing foot and ankle conditions, including toe arthritis.[1-2]
References
1.Comparison of the Self-Reported Foot and Ankle Score (SEFAS) and the American Orthopedic Foot and Ankle Society Score (AOFAS).Cöster MC, Rosengren BE, Bremander A, Brudin L, Karlsson MK.
Foot & Ankle International. 2014;35(10):1031-6. doi:10.1177/1071100714543647.
2.Reliability, Validity and Responsiveness of the German Self-Reported Foot and Ankle Score (SEFAS) in Patients With Foot or Ankle Surgery.Arbab D, Kuhlmann K, Schnurr C, et al.
BMC Musculoskeletal Disorders. 2017;18(1):409. doi:10.1186/s12891-017-1772-1.