The main objective of the study is the evaluation of the outcomes following treatment for TMC
OA using a set of variables covering all OMERACT categories as well as the dimensions of the
International Classification of Functioning, Disability and Health (ICF). Secondary aims are
the analysis of the determinants of patient satisfaction with the treatment result, the
evaluation of the psychometric properties of the Michigan Hand Outcomes Questionnaire (MHQ),
which has not yet been established in TMC OA patients, as well as the economic impact
associated with TMC OA.