Correct Answer: 1, 2 and 4

Incisional hernia is the protrusion of intra-abdominal contents through a previously made surgical incision, occurring due to failure of fascial healing and disruption of the abdominal wall closure. Its development depends on patient-related factors, technical factors, and postoperative complications that impair normal wound healing.

Analysis of Options

• 1. Malnutrition: Correct. Malnutrition (low protein/albumin status, vitamin C and zinc deficiency) impairs collagen synthesis and cross-linking, resulting in poor fascial healing and reduced tensile strength of the scar, which predisposes to incisional hernia.
• 2. Postoperative wound infection: Correct. Surgical site infection is one of the strongest and most well-established risk factors for incisional hernia. Infection causes local tissue destruction, delayed wound healing, and disruption of the fascial closure, greatly increasing the risk of subsequent hernia formation.
• 3. Non-absorbable suture material: Incorrect in this context. It is actually the use of rapidly absorbable suture material (which loses tensile strength before the fascia has regained adequate strength, typically needed at 6 weeks to 3 months) that predisposes to incisional hernia. Non-absorbable or slowly absorbable monofilament sutures (e.g., polypropylene, PDS) are preferred for fascial closure precisely because they retain strength long enough to support healing and reduce hernia risk.
• 4. Immunocompromised patient: Correct. Immunosuppression (e.g., due to steroids, chemotherapy, diabetes, malignancy, or HIV) impairs fibroblast function, collagen deposition, and overall wound healing, increasing susceptibility to incisional hernia.

Since malnutrition, postoperative wound infection, and immunocompromised state (1, 2 and 4) are all recognized predisposing factors, while non-absorbable suture material is protective rather than a risk factor, the correct combination is 1, 2 and 4.