The sub-specialties are broken down for Orthopaedic Specialists to allow those specialists who have specialised in specific areas to take referrals for just their areas. For example, an Orthopaedic Specialist who applies for the spine sub-speciality, will only be sent referrals that relate to spine cases.
A General Orthopaedic Specialist may receive referrals that relate to any of the speciality areas, plus others. This does not result in more work for General Orthopaedic Specialist, it just means that there will be no theme to their referrals. They may still receive spine referrals, or shoulder referrals etc.