Fig. 1

Study enrollment flowchart. ^a16 patients operated on with unilateral trapeziectomy during 1998–2005 had contralateral trapeziectomy before 1998 or after 2005. ^bExclusion criteria: Trapeziectomy performed less than 10 years before examination, trapeziometacarpal (TMC) fusion, scaphotrapeziotrapezoidal (STT) fusion, partial wrist fusion (PWF) or total wrist fusion (TWF). ^cScapho-trapezoid-capitate fusion 4 years after unilateral trapeziectomy followed by same procedure contralaterally (radiographs at this follow-up show no radiocarpal OA in any side). ^dHands (operated and non-operated) that met the inclusion criteria (trapeziectomy or intact trapezium) and had none of the exclusion criteria