Both primary operations and reoperations are registered, and reoperations are linked to the index operation using the national identification number assigned to each inhabitant of Norway.
Operating surgeons from 55 hospitals nationwide reported primary operations and reoperations, with causes and type of reoperation, to the NHFR.
Both primary operations and reoperations are recorded.
51 patients who underwent bilateral operations and/or reoperations were excluded.
By studying reoperations and revisions, we wanted to identify risk factors for the outcome of the MP stem using any further operation of the same hip after the index procedure (reoperation), or exchange of parts (or the entire prosthesis), or implant removal (revision) as outcome parameters.
The primary endpoint of the COMICE trial considered the proportion of patients undergoing a repeat operation or mastectomy at further surgery within 6 months of randomisation, or an avoidable mastectomy at initial surgery (reoperation rate).
A comparison of all recorded occasions of surgical interventions with the number of first-recorded operations on a patient suggested that about 10% of the surgical interventions were reoperations related to the fracture or operations for a subsequent fracture of the distal radius during the period (data not shown).
Patient flow varied between the groups, e.g. patients who underwent primary hemiarthroplasty spent more time in hospital during the first stay, while patients who underwent internal fixation as primary operation had a higher incidence of reoperations.
The specialists performed 411 operations and generated 29 (7.1%) complications, and 19 (4.6%) reoperations.
Jämsen et al. (2009) reviewed 38,676 knee prosthesis operations but they used not only revisions but also reoperations as endpoint.
