Surgeons trying to reconstruct the face of hostage survivor Yik Siu-ling are expected to use her twin sister as a reference. Yik, 34, remained in stable condition in Prince of Wales Hospital's surgical ward in Sha Tin yesterday. She was still unable to talk and needed a respiratory tube to breathe, the hospital said. On Thursday, surgeons operated to remove dead tissue from Yik's thumbs and lower jaw, which were shattered by a bullet. A hospital spokeswoman said Yik needed to have another operation to reconstruct her face. The procedure would be conducted by a team of specialists drawn from the fields of head and neck surgery, orthopaedics and traumatology, and dental surgery. The surgical team planned to take measurements of the twin sister's facial features to help restore Yik's face, medical workers who were familiar with the operation said. The surgery, which will take a whole day, is expected to be performed in about two weeks, after all her infections have cleared. The medical sources described the upcoming surgery as a 'major reconstruction operation' for Yik. Such surgery usually involves taking a piece of bone and skin tissues from the patient's leg to reconstruct facial features. That is normally followed by further minor operations to 'tidy up' the wounds. The medical workers said the surgical team believed the woman would regain her look and facial functions, though there would be scarring on the face. They said such an operation was a routine one that specialist surgeons carried out from time to time. Yik was expected to stay another month in hospital before she could go home, they said. Her boyfriend, Joe Chan Kwok-chu, underwent a second operation on Monday mainly to attach skin grafts to his left hand. His doctor, Dr Ho Pak-cheong, had expressed concern that Chan, 46, was unlikely to recover full use of his right hand, which was more seriously injured, because of damaged nerves. Doctors will tie splints to his hands, keeping them in the right positions to help him undergo rehabilitation. Meanwhile, Jason Leung Song-xue, 18, remained in Tuen Mun Hospital's intensive care unit after having a brain operation last week. Medical workers from the hospital have said the procedure involved putting the teenager in a coma to help his brain rest and recover.