tendon lengthening

This procedure is a kind of attenuating technique for rectus muscles. It is partially cut at the sides or the same side of the tendon or muscle, and the contraction is made by the tension of the muscle itself, and the incision is pulled apart to extend the muscle. The extent of muscle elongation is related to the length and number of incisions. Helveston (1977) experimented with isolated rabbit eyes to study the amount of tendon-muscle extension that can be produced by various different edge incisions. He found that 80% of the bilateral overlapping edge incision can make the muscles prolonged significantly; incomplete, non-overlapping majority of the edge incision does not cause muscle elongation; a central tendon incision does not extend the muscles. Two incomplete marginal incisions combined with an 80% central tendon incision produce a moderate extension. Treatment of diseases: strabismus microscopic strabismus Indication A squint of a small degree, or a residual slope after correcting strabismus. Contraindications The patient is too old and should be filled with poor general condition. Preoperative preparation Use the same vision machine, prism to check the squint angle, and the Yan's stereogram to check the near and far stereoscopic view. Surgical procedure The conjunctival incision method is the same as general strabismus surgery. The bulbar conjunctiva, the Tenons sac, the extraocular muscles were removed, the muscles were lifted with a squint hook, the fascia was cut open, and the ligament was separated. The Graefe and Stevens methods cut a small opening (50% to 80%) in the middle of the tendon, which is related to the prolonged effect. On the basis of the former, the O'coner method cuts a small opening on both sides of the tendon to enhance the extension effect. Blaskovics advocates that each side of the tendon is cut. The effect of this incision is related to the length of the incision. If the anterior incision is too close to the tendon attachment point, the tendon may be rotated after prolongation, and may cause diplopia in patients with binocular vision. To this end, it is generally safer to make several shorter incisions than two long incisions. Before cutting, first use the hemostatic forceps to clamp the muscles of the two incisions and then cut them to prevent bleeding. It is more convenient to cut the posterior incision and then cut the incision in the front. This procedure can correct about 15 to 20 strabismus (one muscle and one muscle incision). The short-term effect of the rectus marginal incision is obvious, but the long-term effect is significantly reduced. The edge incision method can also be combined with the post-migration technique. complication Eye pain, dryness.