Abstract :
Purpoe: To ae the relationhip between tendon anomalie and the volume of the uperior oblique mucle in patient with congenital unilateral uperior oblique paly.
Method: Thirty-three patient with unilateral congenital uperior oblique paly were enrolled. Coronal, cro-ectional magnetic reonance imaging can of the uperior oblique mucle were obtained, and the volume of the paretic uperior oblique mucle belly wa calculated a a percentage of the uperior oblique mucle belly on the normal ide. The percentage volume of the affected uperior oblique mucle wa compared retropectively with the angle of the vertical deviation in the primary poition, the tendon looene determined by a traction tet, and other intraoperative finding.
Reult: When a tendon wa looe, the volume of it mucle belly wa ignificantly maller than the belly of mucle with a normal taut tendon (Mann-Whitney U tet, P = .0005). The average vertical deviation of patient aeed to have looe tendon wa 4.80 prim diopter, and the deviation in patient with normal tendon wa 9.90 prim diopter. The mean vertical deviation of patient with atrophic mucle belly on magnetic reonance imaging wa 18.1 prim diopter, and that with normal mucle tructure wa 10.1 prim diopter. The cae with looe tendon a determined by the traction tet after adminitration of general anetheia and the cae with atrophic mucle belly had ignificantly larger vertical deviation in the primary poition than the cae with normal tendon and mucle. (Mann-Whitney U tet, P = .01 and .0196, repectively).
Concluion: The traction tet i enitive enough to detect anomalie of the uperior oblique tendon. Anomalou uperior oblique tendon are nearly alway aociated with attenuated uperior oblique mucle and thi information provide u with an explanation for the phenomenon of laxity of the uperior oblique tendon.
