Ligamentous laxity is common in Trisomy 21 (Down's syndrome). The literatur
e has numerous reports of atlanto-axial instability, patellar instability,
carpal instability and other manifestations of joint instability. To date,
no report has been published in the English literature describing non-traum
atic unilateral or bilateral wrist dislocation either in trisomy 21 or in a
ny other condition.