Completely Customised Cranial Cap (C4): Overview Download PDF, 448KB, PDF Patients who have severe stroke or a traumatic brain injury may undergo a life-saving operation, called “decompression craniectomy”. In this surgery, a portion of the patient’s skull bone has been removed, leaving a bone defect in the skull which offers little protection for the underlying brain. The medical team will replace the missing skull bone several weeks or months later. During this period, the patient will potentially be at risk of secondary brain injury in case of a fall. As such, patients are usually recommended to wear rigid sports helmets as standard temporary protection. TTSH Rehabilitation Centre and National Neuroscience Institute's (NNI) Neurosurgery Department have collaborated to create the completely customised cranial cap (C4) as a safe alternative with several benefits. Read on to find out more. [Please download the PDF file if you are unable to view the image below.]