Superior oblique tendon spacer with application of nonabsorbable adjustable suture for treatment of Brown syndrome

Superior oblique split tendon elongation for Brown's syndrome: Long-term outcomes

PURPOSE

To report the outcomes of superior oblique split tendon elongation in Brown's syndrome.

METHODS

Charts of 17 consecutive Brown's syndrome patients who underwent superior oblique split tendon elongation were reviewed and clinical data regarding preoperative, intraoperative, and postoperative data were collected.

RESULTS

About 17 eyes of 17 children with congenital Brown's syndrome underwent superior oblique split tendon elongation between January 2012 and March 2020 by a single surgeon. Mean age at surgery was 5.47 ± 2.82 (range 1.50-13.2). Eight (47.1%) were female. Preoperative deficit of elevation in adduction was -4 in all children. At the end of surgery, all eyes were freely elevated on adduction, on forced duction test. Mean follow-up time of 26.24 ± 11.22 (range 11-53) months. In 15 of 17 children (88.2%), motility improved, orthotropia in primary position was achieved, and head posture eliminated (p < 0.001). Superior oblique palsy occurred in two children, who after reoperation, achieved an acceptable outcome. No intraoperative complications were recorded.

CONCLUSION

The superior oblique split tendon elongation procedure is a useful surgical technique with stable and satisfying outcomes for the treatment of severe congenital Brown's syndrome.

Horizontal Deviations in Congenital Brown Syndrome

PURPOSE

To report the incidence of horizontal deviations requiring surgical correction in patients with congenital Brown syndrome.

METHODS

In a retrospective study, the medical records of all children who underwent a surgical correction of congenital Brown syndrome at Schneider Children's Medical Center of Israel from 1998 to 2016 were reviewed, analyzing the presence of preoperative primary position horizontal misalignment.

RESULTS

Overall, 19 eyes (8 right and 11 left eyes) of 16 patients (7 males, 9 females; mean age: 4.2 ± 2.6 years) were included in this study. Fourteen patients (88%) had surgery for correction of a compensatory head position, including 8 patients (50%) with a head tilt and 6 patients (38%) with a chin-up position, and 2 patients had surgery for primary position hypotropia. All of them underwent a weakening procedure of the superior oblique tendon, by either Z-tenectomy (81%, n = 13) or suture elongation of the superior oblique tendon (19%, n = 3). Fifty-six percent of patients (n = 9) had primary position horizontal deviation before surgery, including 50% (n = 8) exodeviations, ranging from exophoria of 4 prism diopters (PD) to exotropia of 30 PD, and one esotropia of 14 PD. Fifty percent of patients (n = 8) had surgery to correct the horizontal deviation by a recession of either one (31%, n = 5) or two (19%, n = 3) muscles. Mean preoperative horizontal deviation (9.3 ± 3.4 PD) decreased significantly following surgery (1.7 ± 1 PD, P = .001) (paired t test).

CONCLUSIONS

Significant horizontal misalignment is often present in patients with congenital Brown syndrome and its correction should be considered at the time of surgery. [J Pediatr Ophthalmol Strabismus. 2018;55(2):113-116.].

Adjustable superior oblique tendon spacer with application of nonabsorbable suture for treatment of isolated inferior oblique paresis

PURPOSE

To evaluate and report the outcomes of a superior oblique tendon spacer procedure using nonabsorbable adjustable sutures in patients with inferior oblique (10) paresis.

METHODS

This interventional case series included 6 eyes of 6 patients with 10 paresis. All met Bielschowsky/Parks Three-step Test criteria to identify an isolated 10 paresis. In all patients, the superior oblique tendon was exposed; 2 nonabsorbable polyester sutures were placed 3 mm apart, and the tendon was cut. With the use of a slipknot, the cut ends of the tendon were separated 5 to 7 mm. Tendon separation was adjusted intraoperatively according to the fundus torsion and exaggerated traction test.

RESULTS

The mean duration of follow-up was 8.1 months (range, 5-12 [corrected] months). Four patients had congenital 10 paresis and 2 had iatrogenic 10 paresis following denervation/myectomy of 10. Mean primary position hypotropia improved from 15.2 prism diopters (PD) before surgery to 2.7 PD in congenital 10 paresis and from 11.5 PD to 2.5 PD in iatrogenic 10 paresis. In congenital 10 paresis, mean preoperative superior oblique overaction and 10 underaction was +2 and -2, which decreased to 0 and -1.25 respectively; fundus incyclotorsion resolved in all patients. Superior oblique overaction and 10 underaction improved in iatrogenic 10 paresis as well. In no patient did an overcorrection develop.

CONCLUSIONS

The adjustable superior oblique tendon suture spacer procedure is an effective and safe option for correcting 10 paresis without developing iatrogenic superior oblique paresis.

Superior oblique tendon expansion with Achilles tendon allograft for treating Brown syndrome

PURPOSE

To report the results of treatment of Brown syndrome using Achilles tendon allograft as a superior oblique tendon expander.

METHODS

Achilles tendon allografts were prepared from the tissue bank. Five eyes of 3 patients with congenital Brown syndrome (mean age, 6 years) were enrolled in the study. Surgery was performed with a superotemporal conjunctival fornix approach. The superior oblique tendon was exposed and severed; then a 2- to 3-mm-wide strip of Achilles tendon (with a thickness of 1-2 mm) was trimmed and sutured between the cut ends using double-armed 5-0 Mersilene sutures. The length of the expander ranged from 7 mm to 8 mm, depending on the severity of the disease.

RESULTS

The preoperative hypotropia in primary position ranged from 15(Δ) to 30(Δ), with abnormal head position in 1 patient. Nine months after the operation, 2 eyes with moderate Brown syndrome showed an improvement in the hypotropia to <3(Δ), and 2 eyes with severe disease had residual hypotropia of 5(Δ). Another eye with severe Brown syndrome had a residual hypotropia of 20(Δ). The elevation in adduction improved by 1 grade in 1 eye and resolved in the other 4 eyes. The amount of correction in the deviation improved with time. None of the patients developed secondary superior oblique palsy, rejection, infection, extrusion, prolonged ocular inflammation, or foreign body sensation.

CONCLUSIONS

Superior oblique tendon elongation with Achilles tendon allograft had acceptable short-term results in 4 of 5 eyes treated for Brown syndrome.

[Superior oblique sharpening surgery in the treatment of Brown syndrome plus]

PURPOSE

To describe superior oblique sharpening in congenital Brown syndrome plus.

MATERIAL AND METHODS

A retrospective study of 17 Brown syndrome cases that were treated with oblique superior sharpening from 1997 to 2007. Vertical deviation in primary position was classified as + to +++, head tilt as: mild (< 10°), moderate (10-20°) and severe (≥ 20°); elevation in adduction from -1 to -4. A good postoperative result was considered if last elevation limitation in adduction was zero or -1, without head tilt and vertical deviation in primary position.

RESULTS

Mean age was 4.9 years. Limitation elevation in adduction which was -3 in 8 cases (47.1%) and -4 in 9 (52.9%), which improved completely after surgery in 6, -1 in 9 and -3 in 2 patients. Preoperative hypotropia in 15 cases (13 mild, 1 moderate and one severe) was resolved in 13 after surgery. Of 14 patients with torticollis (3 mild, 10 moderate and one severe) it was surgically corrected in 11. Success was achieved in 14 (82.4%), 2 were under corrected (11.8%) and one was overcorrected (5.88%). Mean follow-up was 60.71 months.

CONCLUSIONS

Oblique superior sharpening as treatment for Brown syndrome plus is an effective procedure. The incidence of secondary oblique palsies has been very low.

Palmaris longus tendon as an autogenous expander for Brown's syndrome: a novel technique

INTRODUCTION

The palmaris longus tendon (PLT) is one of the most commonly used donor tendons in orthopedic and reconstructive surgery. We present a new surgical technique using this autogenous tissue for lengthening the superior oblique tendon in cases of moderate to severe Brown syndrome.

METHODS

Four children with Brown syndrome were selected, and consent was obtained. Preoperative motility assessment and intraoperative forced duction tests confirmed the diagnosis. PLT harvesting was performed under general anesthesia. Follow-up ranged from 12 to 21 months.

RESULTS

Preoperatively all patients demonstrated hypotropia of 16Delta to 30Delta with an abnormal head posture. Postoperatively all patients showed an improvement in hypotropia to <3Delta, with complete resolution of abnormal head posture. Improvement of elevation in adduction did not match that of the vertical deviation, but all patients had less restriction of elevation in adduction after surgery. No patients developed any of the complications encountered with a silicone expander (eg, extrusion, tendon-related inflammation, foreign body sensation, or consecutive superior oblique palsy), and none needed further surgery. Wrist function was completely normal in all patients postoperatively.

CONCLUSIONS

PLT is an autogenous tissue that allowed for controlled weakening of the superior oblique tendon, with minimal complications observed in four patients. More studies comparing PLT tendon expansion with other published methods are warranted.

Horizontal mattress technique for superior oblique suture spacer

Superior oblique tendon overaction and Brown syndrome have been managed surgically by means of tenotomy/tenectomy, use of a silicon expander, and elongation with autologous fascia lata. These solutions are problematic with respect to corrective precision, injury and complications, or surgical difficulty. We present a simple "mattress" suture spacer technique that allows a precise and secure intraoperative adjustment.