Abstract
Introduction
Analysing the results of angular stable osteosynthesis in large groups of patients can give us an indication of the possibilities and limitations of both angular stable nailing and plating.
Material and Methods
Fractures have been classified using the AO-classification system.
To judge vascularisation of the head fragment we use the criteria as described by Hertel.
We considered fracture reduction as adequate when the CCD-angle could be restored, with a maximum of 10° varus or valgus malalignment and a maximal persistent tuberosity displacement equal to or less than 3 mm in any direction.
An independent investigator collects information on reoperations based on: patient interview, hospital data and contact with the operating surgeon if the revision took place elsewhere. Reoperation is defined as any secondary surgical procedure after the initial open reduction and fixation.
Results
In the period between December 2001 and June 2006 383 patients have been treated for proximal humerus fracture using one of the above described implants.
There were 70 reoperations (i.e. 22,6%) of which 31 hardware removals. In C-type fractures there were significantly more reoperations than in B-type fractures (p<0,0001). Although statistically not significant (p = 0,053) there was a lower reoperation rate in A-type fractures than in C-type fractures. Neither gender nor ASA classification did have any influence on reoperation rate (p = 1 for both gender and ASA 3 or more versus less than 3). Avascularity of the head (p<0,001) and quality of reduction (p<0,0001) did have a significant influence on reoperation rate.
Based upon these observations and on the fact that secondary surgery in the friable ASA 3+ patient does put this patient at an increased risk of morbidity and mortality, we developed a scoring system to differentiate indications for osteosynthesis from those of primary arthroplasty.
