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Purpose The aim of this study was to evaluate the possible risk factors for developing a parastomal hernia (PSH) in a cohort of rectal cancer patients with and without the application of a retro-muscular prophylactic mesh. The evaluated risk factors included the position of the stoma in the rectus abdominis muscle (RAM), RAM atrophy and shift of abdominal wall midline structures. Methods Rectal cancer patients treated with an abdominoperineal excision or Hartmann’s procedure between 2002 and 2015 at Västmanland Hospital, Sweden was included. Postoperative CT examinations were retrospectively reviewed regarding the presence of PSH and RAM atrophy and for measurements such as position of the stoma in the RAM. Results 116 patients were included, with a median age of 71 years. 70 patients received a prophylactic stoma mesh. 55 patients (47%) had a parastomal hernia at three-year follow-up. Rectus abdominis muscle atrophy was significantly higher in the mesh group compared with the non-mesh group (37% vs 2%;  P  = 0.04). RAM atrophy was a significant independent protective factor for developing a PSH ( P  = 0.007; OR 0.15; 95% CI 0.03–0.55). Conclusion Placement of a prophylactic retro-muscular stoma mesh resulted in a high frequency of RAM atrophy distal to the stomal aperture and patients with such atrophy had a lower risk of developing a PSH.

Use of prophylactic stoma mesh is a risk factor for developing rectus abdominis muscle atrophy