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Terminal chop: New technique for full thickness nuclear segmentation in mature hard cataract.

ABSTRACT: We describe an efficient technique, "Terminal Chop," for full thickness nuclear segmentation in mature hard cataracts. Terminal chop utilizes the principle of secondary rock breakage system with stress concentration to break these hard nuclei. In this technique consonant to drag picks, a specially designed chopper "Terminator" is used to initiate a unique dispersive mechanical force to create a full thickness nuclear crack (crack formation) at the weakest soft and thin equator, which automatically traverses through the center and to the equator on the other side. Lateral separation of both the instruments placed at the equator, propagates the initial full thickness nuclear crack (crack propagation), breaking the entire nucleus into two complete pieces including the posterior plate. The direction of splitting follows the cleavage plane in a more direct manner, thus requiring least fracture force, least manipulation and stress, much lower than compressive stress, causing minimal trauma, and highly satisfactory postoperative results.

SUBMITTER: Prasad R

PROVIDER: S-EPMC5742972 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:BACKGROUND: The single-row and double-row fixation techniques have been widely used for rotator cuff tears. However, whether the double-row technique produces superior clinical or anatomic outcomes is still considered controversial. This study aims to use meta-analysis to compare the clinical and anatomical outcomes between the two techniques. METHODS: The Pubmed, Embase, and Cochrane library databases were searched for relevant studies published before November 1, 2012. Studies clearly reporting a comparison of the single-row and double-row techniques were selected. The Constant, ASES, and UCLA scale systems and the rotator cuff integrity rate were evaluated. The weighted mean differences and relative risks were calculated using a fixed-effects or random-effects model. RESULTS: Eight studies were included in this meta-analysis. The weighted mean differences of the ASES (-0.84; P?=?0.04; I(2)?=?0%) and UCLA (-0.75; P?=?0.007; I(2)?=?0%) scales were significantly low in the single-row group for full-thickness rotator cuff tears. For tear sizes smaller than 3 cm, no significant difference was found between the groups no matter in Constant (P?=?0.95; I(2)?=?0%), ASES (P?=?0.77; I(2)?=?0%), or UCLA (P?=?0.24; I(2)?=?13%) scales. For tear sizes larger than 3 cm, the ASES (-1.95; P?=?0.001; I(2)?=?49%) and UCLA (-1.17; P?=?0.006; I(2)?=?0%) scales were markedly lower in the single-row group. The integrity of the rotator cuff (0.81; P?=?0.0004; I(2)?=?10%) was greater and the partial thickness retear rate (1.93; P?=?0.007; I(2)?=?10%) was less in the double-row group. Full-thickness retears showed no difference between the groups (P?=?0.15; I(2)?=?0%). CONCLUSION: The meta-analysis suggests that the double-row fixation technique increases post-operative rotator cuff integrity and improves the clinical outcomes, especially for full-thickness rotator cuff tears larger than 3 cm. For tear sizes smaller than 3 cm, there was no difference in the clinical outcomes between the two techniques. LEVEL OF EVIDENCE: Level I.

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Terminal chop: New technique for full thickness nuclear segmentation in mature hard cataract.

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