comparison between two groups of large midline incisional hernia, the first group managed by double mesh modification of chevrel's technique the second one managed by conventional onlay mesh repair
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incidence of skin flap ischemia
Timeframe: 24 hours postoperative
incidence of seroma formation
Timeframe: 24 hours after drain removal
incidence of hernia recurrence
Timeframe: in the first 2 years post operative