The most important properties of meshes were found to be the type of filament, tensile strength and porosity. These determine the weight of the mesh and its biocompatibility. The tensile strength required is much less than originally presumed and light-weight meshes are thought to be superior due to their increased flexibility and reduction in discomfort. Large pores are also associated with a reduced risk of infection and shrinkage. For meshes placed in the peritoneal cavity, consideration should also be given to the risk of adhesion formation. A variety of composite meshes have been promoted to address this, but none appears superior to the others. Finally, biomaterials such as acellular dermis have a place for use in infected fields but have yet to prove their worth in routine hernia repair.

Surgery should be reserved for symptomatic patients; asymptomatic patients may benefit from surveillance. Pulmonary aspiration mandates surgical intervention. Myotomy remains the mainstay of treatment and an adequate subdiverticular extension is crucial in relieving obstruction. A partial fundoplication is preferred in selected patients. Minimally invasive techniques should become the routine approach for oesophageal pulsion diverticula.

Background: Laparoscopic cholecystectomy is commonly performed, and several factors increase the

Further studies are required to compare laparoscopic and open abdominoplasty techniques. Patients and physicians should be advised that correction is largely cosmetic, and although divarications may be unsightly they do not carry the same risks of actual herniation. Progressive techniques have resulted in risk reduction with no associated surgical mortality. However, the outcomes may be imperfect, with unsightly scarring, local sepsis and the possibility of recurrence.