THE biggest surgical congress to be held in Hong Kong ended yesterday, having been declared a resounding success both by its organisers and its delegates. Professor John Wong, head of surgery at Hong Kong University and chairman of the local organising committee, said he had heard nothing but praise for the packed six-day event. ''From all the reports we've had, people thought that this meeting had the best scientific programme that had ever been organised by the congress,'' he said. ''And, logistically, they said this was the most flawless meeting they had ever attended.'' This was the first time the International Society of Surgery had held its International Surgical Week in Hong Kong, and only the second time in Asia. The conference covered a huge variety of subjects. Professor Wong said it was difficult to pick out any one area as being of particular interest because so many specialities had been covered in depth. But he said he felt the paper on the state of the art in organ transplantation, as well as the papers on cancer, reconstructive surgery, burn injuries and trauma, were among the highlights. And he said Hong Kong surgeons had held their own in this gathering of the world's experts.