Port fixity during laparoscopic surgery; a randomised comparison of cutting and blunt induction of secondary ports

INTERVENTION: Group 1: 5mm and 10mm ports with cutting trocars and smooth shaft Group 2: 5mm and 10mm ports with conical trocars and smooth shaft CONDITION: Surgery: Laparoscopy ; Surgery ; Laparoscopy PRIMARY OUTCOME: The traction required to partially withdraw the secondary 5mm and 10mm port from the abdominal wall is measured using purpose designed device. The measurements will be taken at the beginning of surgery and every 30mins thereafter until completion of the operation. SECONDARY OUTCOME: Not provided at time of registration INCLUSION CRITERIA: 50 patients will be consented and the study will compare 50 5mm ports and 50 10mm ports in each group.