The Australian Knee Clinic incorporated in 1974 after Dr Cross returned from Hughston Clinic in Columbus, Georgia. Dr Cross spent 12 months as a fellow to Dr Jack Hughston and returned in October 1999 for the 50th anniversary of the clinic.

The philosophy of the Australian Knee Clinic is based on the sound principles taught and practised by Dr Jack Hughston. Every condition of the knee "from the womb to the tomb" is covered.

Dr Cross was the director of Orthopaedics for the Sydney 2000 Olympics and a member of the board of the Australian National Rugby League (NRL) from 1999 to 2005.