Bedsore & Pressure Ulcers | Flap choice and operating plan

A skin graft is the simplest closure but is not ideal for weight-bearing areas; it is thin and delicate, can break down easily, and adds no padding. It may suit superficial ulcers or be used after negative-pressure wound therapy to reduce wound size before definitive reconstruction. A flap carries its own blood vessels and can fill dead space, cover deeper defects and better withstand pressure and shear. Skin grafts need a well-vascularized wound bed; flaps bring their own circulation and padding, so they are often preferred for deeper or pressure-bearing ulcers. The choice depends on ulcer stage, exposed bone or tendon, blood supply, nutrition, mobility and whether risk factors can be corrected.

Sacral ulcers develop after prolonged pressure, often in people with limited mobility. Flap choice depends on the defect, tissue available and whether you are ambulatory. Gluteal transposition or rotation flaps can cover many sacral ulcers with adequate tissue; V-Y advancement flaps are often used when lower-extremity use is limited. Some sources mention superior gluteal artery, transverse back, rhomboid fasciocutaneous or gluteal perforator options. Biceps femoris and tensor fascia lata flaps are more associated with perineal or trochanteric areas. In ambulatory patients, muscle-containing flaps may affect pelvic stability, so fasciocutaneous options may be preferred in some cases. The aim is reliable coverage after debridement, not a single universal flap.

An ischial sore often develops from prolonged sitting, especially after spinal cord injury, and may expose bone or extend into nearby areas. A heel sore arises at a weight-bearing foot site. Flap reconstruction transfers tissue with its blood vessel to fill the defect and help healing. Because no flap type has shown clear superiority in complication or recurrence rates, choice depends on defect size, depth, blood supply, prior surgery and overall condition. The operation aims to close the sore and support healing, but recurrence remains possible, so prevention continues after surgery. Complications can include infection, wound opening, fluid collection or flap problems.

Flap surgery closes a clean defect; it does not treat the ulcer itself. Complete debridement is essential because incomplete removal can cause flap failure and wound dehiscence. The surgeon may need to remove bursa, scar tissue, calcification, nonviable bone and heterotopic ossification, then obliterate dead space. Hidden sinus tracts, pseudobursa, residual dead space, infection and incontinence can also contribute to recurrence, so debridement may be expanded to fully expose necrotic tissue before closure. Bacteriologic balance and tissue assessment may be needed before definitive closure, and risk factors such as pressure, nutrition and smoking should be addressed because recurrence remains high. The flap should fit without excessive tension.

NPWT applies suction to the wound bed. In pressure-ulcer care, it drains exudative fluid, increases blood flow and granulation tissue, and shortens preparation time for reconstruction; its healing-promoting effect is widely accepted by clinicians. It also accelerates wound healing or prepares wounds for grafting. Avoid it with exposed vessels, fistulas, active infection or malignancy; use after adequate debridement and hemostasis. In lower-extremity injury care, routine NPWT as a bridge to flap reconstruction has been associated with lower infection rates and improved flap survival, though its exact mechanism remains under investigation. Flap reconstruction then transfers living tissue with its blood supply to close the defect.

If the same flap has already been readvanced or tissue is poor quality from recurrent ulceration or scarring, a new, preferably unused anatomic area may be needed. A change of plane, such as advancing a fasciocutaneous flap over a previous musculocutaneous flap, can add length without using another region. Because each flap uses finite tissue, surgeons plan every operation to preserve future options. Every pressure sore surgery should allow for future secondary procedures, and multiple options should still exist even after multiple recurrences. Recurrence is common long-term, so original risk factors should be reassessed before repeat surgery; neglecting them reliably leads to poor outcomes.

Pressure-ulcer reconstruction aims for reliable soft-tissue coverage. Muscle helps eliminate dead space and improve wound vascularity, but thick muscle flaps are not always best. Flap selection also considers defect size, patient condition, recurrence risk, and preserving enough tissue reserve. Each flap uses finite tissue reserve, so even partially reducing ulcer size helps. For ambulatory patients with sensation, the selected flap should not affect walking, stair climbing, or hip or knee flexion; for example, the upper and lower portions of gluteus maximus should not be used as a rotation flap. Detaching the gluteus muscle tendinous insertion, or using hamstring muscles, can also matter.

The operation removes the ulcer, bursa and scarred tissue, then covers the defect with living tissue that fills dead space. Tension-free suturing at the area of direct pressure is essential to reduce recurrence. The flap is chosen according to the ulcer site, the patient’s ambulatory status and available tissue, and it should interfere as little as possible with future local flaps if recurrence occurs. Incision placement and flap rotation are individualized; for example, some thigh-based flaps are marked along the mid-lateral thigh or from the lower margin of the defect, while sacral or ischial cases use positioning that avoids tension after closure.

Flap reconstruction closes a pressure ulcer with living tissue, but it needs a clean, well-prepared wound bed. Significant stool soiling may warrant considering a diverting colostomy before reconstruction, and a urethral fistula should be diverted and healed first. The wound should be free of dead tissue and infection, with healthy healing tissue, and bacterial load minimized. Nutrition and other medical conditions also need optimization because complication rates can be high. These steps protect the flap from contamination and support healing. Urological assessment and bowel management are therefore part of preoperative planning. The aim is to reduce infection risk and give the flap the best chance to survive.