The membrane surrounding the human brain is easy to overlook until it is damaged. Known as the dura mater, this dense layer of connective tissue forms the outermost protective covering of the brain and spinal cord. It helps contain cerebrospinal fluid, supports intracranial structures, and acts as a barrier against infection. During neurosurgical procedures, however, the dura may be removed, torn, or left with too little tissue for direct closure. Surgeons must then perform a procedure called duraplasty, reconstructing the membrane with either tissue taken from the patient or a manufactured graft. A prospective randomized study from India has now compared two commonly used materials—autologous pericranium and high-density polypropylene—offering new evidence about their short-term safety in cranial surgery.
Duraplasty is more than a technical step at the end of an operation. An ineffective repair can allow cerebrospinal fluid, or CSF, to escape through the surgical wound. CSF leakage may produce persistent fluid collections, wound breakdown, infection, meningitis, or the formation of a subdural empyema, in which pus accumulates between the protective layers surrounding the brain. A watertight closure is therefore a central goal of cranial reconstruction. The choice of graft can influence how easily that closure is achieved, how the tissue heals, and how the immune system responds. In many hospitals, surgeons select between biological tissue and synthetic substitutes according to the size and location of the defect, the availability of tissue, the urgency of surgery, and local cost considerations.
Autologous pericranium has traditionally been considered one of the most biologically compatible materials for dural repair. The pericranium is a vascularized connective-tissue layer that covers the outer surface of the skull. Because it comes from the patient, it does not introduce a foreign polymer and is generally well tolerated by the body. It can also become incorporated into the healing tissues surrounding the repair. Its use, however, requires harvesting during the operation, and the amount and quality of available pericranium may be limited by previous surgery, trauma, infection, or the nature of the underlying disease. Synthetic grafts such as high-density polypropylene, marketed in this setting as G-Patch, provide a standardized material that is immediately available and can be used when autologous tissue is inadequate or unsuitable.
The research team, led by Dr. Shubham Gupta of Sawai Man Singh Medical College and Hospital in Jaipur, India, designed a prospective randomized comparative study to examine whether the two approaches produced different early postoperative outcomes. The work was conducted at a tertiary care center in Central India in collaboration with investigators from M.G.M. Medical College and MYH Hospital and Max Smart Super Speciality Hospital. Patients undergoing cranial surgery between January and December 2021 were considered for enrollment. The investigators initially included 121 consecutive patients. After excluding individuals who died within 30 days of surgery, because postoperative complications could not be evaluated in the planned follow-up period, 100 patients remained for the final analysis. Fifty received autologous pericranium and 50 received high-density polypropylene grafts.
The researchers monitored the patients for 30 days after surgery, focusing on complications that could indicate failure of the repair or problems with wound healing. These outcomes included surgical-site infection, CSF leakage, meningitis, subdural empyema, wound dehiscence, bone flap osteitis, and subcutaneous CSF collection. The overall complication rate was 26 percent among patients who received the synthetic graft, compared with 12 percent among those repaired with autologous pericranium. Wound infection was the most frequently observed complication in both groups. At first glance, the numerical difference appears clinically important, particularly because infection and CSF leakage can require additional treatment, prolonged hospitalization, or repeat surgery. Yet the statistical analysis did not demonstrate a significant difference between the two materials.
That distinction is crucial. A numerical difference between groups does not automatically establish that one treatment is better. Statistical significance depends partly on the size of the observed effect and partly on the number of patients studied. With only 50 patients in each treatment group, the study may not have had sufficient statistical power to reliably detect a moderate difference in complication rates. The investigators also adjusted their analysis for differences in the patients’ underlying diagnoses, which could independently affect the risk of infection or wound failure. After adjustment, the findings still did not show a statistically significant advantage for either graft. The results therefore support the short-term feasibility of both materials, but they do not prove that the materials are equivalent or that pericranium is superior.
The study highlights a practical tension at the heart of reconstructive neurosurgery. Pericranium offers a patient-derived biological surface and requires little additional operative time to harvest when it is available. Polypropylene, by contrast, eliminates the need for tissue collection and provides a consistent, ready-to-use product. In an emergency, or when the scalp and pericranium have been damaged, that availability can be decisive. Synthetic materials may also simplify planning when a large defect is expected. At the same time, polypropylene is a foreign body, and surgeons must consider how the material interacts with surrounding tissue, whether it becomes incorporated, and how it performs in the presence of contamination or infection. The present findings suggest that both choices can be incorporated into routine practice, with selection tailored to the individual operation.
The authors emphasize that the findings should be interpreted within the limits of the study design. The final sample was relatively small, and the patients had a mixture of surgical conditions rather than one uniform diagnosis. A patient undergoing tumor surgery may have a different baseline risk from someone treated for trauma, hydrocephalus, infection, or another cranial disorder. Differences in diagnosis between the treatment groups could therefore influence the observed complication rates, even after statistical adjustment. The follow-up period was also limited to 30 days. Some graft-related problems, including delayed infection, persistent CSF disturbance, adhesions, or long-term structural changes, may emerge only months or years after surgery. In addition, excluding patients who died within 30 days means the findings describe early complications among survivors rather than the full risk profile of all patients undergoing cranial duraplasty.
Larger multicenter trials will be needed to determine whether the apparent difference in complications reflects a true clinical advantage for autologous pericranium or simply the variation expected in a small study. Future research could stratify patients by diagnosis, defect size, surgical indication, contamination status, and the use of antibiotics or drains. Longer follow-up would help identify delayed complications and assess whether either material influences reoperation rates, quality of life, hospital costs, or neurological recovery. For now, the Indian study provides prospective comparative evidence that both autologous pericranium and high-density polypropylene can be used for cranial duraplasty with acceptable short-term safety. Its most important message is not that one graft has defeated the other, but that surgeons need stronger evidence before turning a common clinical preference into a universal rule.
Subject of Research: People
Article Title: A comparative analysis of early postoperative outcomes of autologous pericranium versus high-density polypropylene in cranial duraplasty in a tertiary care center in Central India
News Publication Date: 7-Jul-2026
Web References: https://doi.org/10.1186/s41016-026-00440-y
References: Chinese Neurosurgical Journal. “A comparative analysis of early postoperative outcomes of autologous pericranium versus high-density polypropylene in cranial duraplasty in a tertiary care center in Central India.” DOI: 10.1186/s41016-026-00440-y
Image Credits: Dr. Shubham Gupta from Sawai Man Singh Medical College and Hospital, India
Keywords: Health and medicine; Life sciences; Neuroscience; Neurosurgery; Neurology; Developmental biology; Surgery
