An adjustable transposition procedure for abduction deficiences.

We used an adjustable transposition procedure in two cases of horizontal abduction deficiency (one of lateral rectus palsy and one of Duane syndrome with marked co-contraction). Primary position balanced alignment and maximum balanced rotations were obtained without inducing vertical deviation as the result of the transposition. The vertical force vectors were neutralized by the self-adjusting nature of the vertical rectus union. The procedure allowed for both intraoperative and postoperative adjustment of the result.