Tendon elongation

This operation is a weakening operation for the rectus muscle. It is used to make incisions on both sides of the tendon or muscle or on the concentric side. It uses the muscle's own tension to generate a contraction, and the incision is pulled apart to extend the muscle. The extent of muscle extension is related to the length and number of incisions. Helveston (1977) has performed experiments on isolated rabbit eyes to study the amount of tendon-muscle elongation that can be produced by various marginotomy. He found that 80% of bilaterally overlapping edge incisions (Figure 1, C, D) can significantly lengthen the muscles; incomplete, non-overlapping most edge incisions (Figure 1, E, F) Basically does not cause muscle elongation; one central tendon incision (Figure 1, A) does not lengthen muscles; two incomplete marginal incisions combined with 80% of central tendon incision (Figure 1, B) can produce moderate extend.