The authors aimed to compare the reliability of the Mendonca strabismus forceps vs intraoperative calliper measurements for determining the distance from the limbus to the insertion of the extraocular muscles in patients undergoing strabismus surgery. This was a prospective observation masked study of 42 patients with mean age 26.4 ±18.7 years; 20 female, 22 male. Intraoperative muscle measurement was 6.9 ±1.65mm vs 6.97 ±1.85mm preoperatively (intraclass correlation 0.851). Estimated difference between measurements was 0.678mm. Of 77 eyes, 58 had no previous eye surgery and the differences for all of their measurements was within a 1mm limit. Nineteen had prior surgery; 16 were within a 1mm limit and the remaining three had anomalous scarring. The number of prior surgeries was significant for differences in measurements as well as for differences in muscle localisation. Type of muscle did not influence muscle localisation. The authors conclude the use of the Mendonca strabismus forceps is a reliable and non-invasive method for locating the insertions of muscles without the need for additional imaging studies.
Use of the Mendonca strabismus forceps in locating and measuring muscle insertions
Reviewed by Fiona Rowe
Reliability of the Mendonca strabismus forceps in locating the insertion of the extraocular rectus muscles in patients undergoing strabismus surgery.
CONTRIBUTOR
Fiona Rowe (Prof)
Institute of Population Health, University of Liverpool, UK.
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