[The problem of normal stability of the trapeziometacarpal joint].

In 50 healthy and asymptomatic people the stability of the trapeziometacarpal joint of the thumb was evaluated. A mean subluxation of 3,32 mm on the radial side (type 1), and of 0,32 mm on the dorsal side (type II) was found. At the minimum the joint was completely stable; the maximal value was 7 and 3 mm. Higher values must be estimated as pathological joint laxity.