Until the end of December, 430 patients at United Lincolnshire Hospitals trust waited longer than the national six-month target. An investigation into irregularities was launched last year.
Chief executive Helen Scott-South was suspended in November, and subsequently retired. Three other staff were also suspended, one of whom one has resigned, one disciplined, and the third cleared of misconduct but undergoing retraining.
A report to the board last year said there was 'clear evidence of deliberate manipulation of waiting lists'. More than 1,200 patients who were on a 'suspended' list had to be contacted to see if they still wanted treatment.
Chief executive Gary Walker said: 'By 28 February 2007 none of our patients will be waiting longer than the national target.'