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Introduction:The technique used for correction of rectus abdominis diastasis has been a debatable issue since the original description of abdominoplasty. The aim of this study is to assess the durability of the correction of midline diastases done by two different techniques (the rectus abdominis myofascial release technique and the conventional midline plication) and their effect on waist enhancement and its safety in the terms of the intraabdominal pressure changes and respiratory affection that occur after plication. Patients and Methods:The study was conducted on 12 females with body mass index less than 30, having Rohrich type IV B deformities. The patients were divided randomly into two groups based on the technique used for plication of anterior rectus sheath: Group (A) 6 patients underwent myofascial release technique, while group (B) 6 patients underwent conventional midline plication. The two groups were compared as regards; 1-The width of rectus diastasis using computed tomography of their anterior rectus abdominis sheath pre-and post-operatively at 1 and 6 and as regards 3 points: (A) At the umbilicus, (B) Midway between umbilicus and xiphoid process and (C) Midway between umbilicus and symphysis pubis 2-Waist hip ratio pre-and post-operatively at 1 and 6 months. 3-Evaluation of ventilatory function using spirometry and intraoperative measurement of intra-abdominal pressure before and after plication.Results: Post-operative follow-up time averaged 8 months (range 6-10 months). Group A showed significant decline in the diastasis distance and increase in WHR than group B. There was a significant reduction in spirometry values and increase in IAP in group A rather than group B after surgery but there was no clinical differences in the respiratory function between both groups.Conclusion: Plication of the anterior rectus sheath using myofascial repair technique showing nonsignificant residual diastasis six months post operatively and has a better effect on the waist enhancement than the conventional plication with no respiratory complication.