Titanium mesh implants exposure after cranioplasty in two children: involvement of osteogenesis?
- Han-song Sheng†1, 3,
- Fang Shen†2,
- Mao-de Wang3,
- Jian Lin1,
- Fen-chun Lin1,
- Bo Yin1 and
- Nu Zhang1Email author
© The Author(s) 2017
Received: 24 July 2016
Accepted: 10 January 2017
Published: 5 April 2017
Although technically regarded as a simple procedure, titanium mesh cranioplasty could lead to various surgical complications, including postoperative implant exposure. However, there is little data available on the occurrence and risk factors of this complication in the pediatric population.
Two pediatric male patients, one 12-year-old and one 7-year-old, had decompressive craniectomy after traumatic brain injuries and subsequent cranioplasty with titanium mesh. However, both patients had skin defects developed gradually at the scalp adjacent to the surgical incisions, 11 and 7 months after cranioplasty, respectively. Implants removal surgeries were then delivered and, during the operation, some bone debris were found just beneath the skin defects in both patients. Because microbiological culture results of the exudations were negative, in addition to the long interval between cranioplasty and developments of skin defects, surgical infections might not be major causes of the observed titanium implants exposures. On the other hand, local osteogenesis and impaired scalp blood supply might contribute to their occurrence.
Efforts should be made to achieve complete clearance of bone debris and protect scalp blood supply during the initial decompressive craniectomy in order to minimize the risks of subsequent titanium mesh exposures.
KeywordsCranioplasty Titanium mesh Complications Osteogenesis Children
Decompressive craniectomy is a routine neurosurgical procedure used to treat patients with refractory high intracranial pressures caused by traumatic brain injury, stroke, and other vascular and neoplastic conditions [1, 2]. The increased survival rates of trauma patients who underwent decompressive craniectomy necessitate reconstructions of these cranial defects for both cosmetic and protective purposes . In addition, cranioplasty is also reported to produce cognitive benefits in these patients, especially in children . Various materials, such as autogenous/xenogenous bone grafts, gold and polymethylmethacrylate, have been used for cranioplasty. However, there is a general preference of titanium mesh to repair the cranial defects because of its biocompatibility, rigidity, lightness, as well as compatibility with magnetic resonance imaging scans . Although regarded as a surgically simple procedure, cranioplasty with titanium mesh has been associated with a high surgical complication rate that is up to 34% . Among them, surgical infection and postoperative hematoma usually require reoperation [7, 8].
Pediatric patients differ from their adult counterparts both physiologically and anatomically. For example, regrowth of the cranium is more common in children than in adults . However, when autologous bone is used for cranioplasty, the pediatric population is reported to have a much higher bone absorption rate than adults . There is still little data available regarding complications associated with titanium cranioplasty in pediatric patients and the associated risk factors , and we reported here two pediatric cases of titanium mesh exposure after cranioplasty. The key findings of both cases are development of osteogenesis just beneath the skin defects and long interval between cranioplasty and mesh exposure. Therefore, instead of surgical infection, osteogenesis of the remaining bone debris and impaired scalp blood supply might contribute to the occurrences of the postoperative mesh exposure.
In order to restore the skull defect produced by craniectomy, cranioplasty is usually performed with either autogenous or alloplastic materials . Although autogenous bone graft is still the best choice whenever possible , titanium mesh has been a popular alternative in view of its lightweight, rigidity, and biocompatibility . Although regarded as a technically simple procedure, cranioplasty has been suggested to have a high complication rate. For example, scalp infections and exposure of the implant may sometime be life threatening and usually require implant removal. However, surgical infections are not likely to be the major causes of implants exposures in our cases. First, neither the patients’ symptoms, e.g. body temperatures, nor the lab tests, e.g. microbiological cultures results, supported the existence of bacterial infections. Second, the time interval between cranioplasty and development of scalp defects was much longer than that were reported in literatures. For example, previous studies have shown the median time from implantation to removal of the implant after infection was 55 days . In our both cases, the titanium mesh was exposed 11 and 7 months after cranioplasty. On the other hand, osteogenesis from the residual bone debris might, at least partially, be responsible for the occurrence of scalp defect. This hypothesis is based on intraoperative observation of a relatively large area of granulation tissue and, more importantly, an enlarged bone debris just under the defects. Previous study has also suggested titanium mesh, as an alloplastic material, is favorable for osteogenesis under the implant . In addition, both cases were pediatric patients and children have greater capacity for tissue regeneration, including ossification of the skull defects . The possible explanation for this osteogenesis related implant exposure might be as flows. First, osteogenesis is a multistep process that involves inflammatory response and the various inflammatory cytokines released during the reossification process might influence adjacent skin healing. Second, the gradually enlarged bone debris might also impart a mechanic stress on the adjacent skin. Therefore, both chemical and physical factors might contribute to the development of scalp defect. Since these residual bone scraps might be a risk factor for development of scalp defect, cautions should be taken to debride the wound completely before closure of the skin incision at the initial craniectomy, especially in the pediatric patients. Other factors, such as impaired blood supply to the scalp, might also contribute to the development of defect and subsequent implant exposure. Further clinical and laboratory studies are needed to clarify the relationship between osteogenesis and development of scalp defects in pediatric patients who received titanium mesh cranioplasty.
Osteogenesis and impaired blood supply might contribute to the development of scalp defects and exposure of titanium mesh underneath in pediatric patients. Complete debridement of bone scraps and protection of the blood supply at the initial craniectomy might help to reduce the risk of its occurrence.
This work was supported by Science Technology Department of Zhejiang Province (Grant No. 2016C33SA300055 & 2015C33144).
Availability of data and materials
Data sharing not applicable to this article as no datasets were generated or analyzed during the current study.
HSS & FS conceived & wrote the manuscript. MDW, JL, FCL, BY did data collection and contributed to manuscript writing. NZ did review and final approval of manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Written informed consent regarding the publication of this case report and its accompanying images was obtained from the patients’ parents. Copies of the written consent are available for review upon request.
Ethics approval and consent to participate
Consents to conduct and report of this study was obtained from the Ethics Committee of Second Affiliated Hospital of Wenzhou Medical University.
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