Reconstruction for extensive sacrococcygeal defects in complex tumor patients with personalized customized gluteus maximus myocutaneous flaps.

Aim: To evaluate the clinical effects of personalized customized gluteus maximus myocutaneous flaps (GMMF) for reconstruction of extensive sacrococcygeal soft tissue defects in complex tumor patients.

Methods: A retrospective chart review was conducted on 8 patients who underwent personalized customized GMMF reconstruction for large sacrococcygeal defect from December 2021 to August 2023. The personalized customized GMMF were designed based on the variations of tissue defect in location, shape and volume of different dead spaces. The principle of the personalized GMMF is to ensure that the rotation point of the flap can reach the farthest end of the defect. Patient demographics, operative characteristics, and perioperative risk factors were analyzed. Clinical outcomes were assessed, focusing on complications such as flap necrosis, wound dehiscence, infection, seroma, and hematoma.

Results: Six patients with rectal cancer and two with sacral tumors underwent personalized customized GMMF reconstruction for extensive sacrococcygeal defects. The average volume of the wound cavity was 104 mL, with a mean vertical depth was 10.8 cm. Six patients had low serum albumin (<35 g/L). After a mean follow-up of 15.5 months, no major complications occurred, except for one seroma that resolved within 2 weeks.

Conclusion: The personalized customized GMMF described in this study is an effective method for reconstructing large sacrococcygeal wounds with significant depth in complex tumor patients. It allows for greater rotation of the muscle flap into the sacrococcygeal wound defect and provides adequate blood supply by utilizing the bulk of muscle tissue to obliterate dead space.