Fixed-angle plates in patella fractures - a pilot cadaver study

In six fresh unfixed female cadavers without history of previous fractures around the knee (average age 88.8 years) a bilateral fixed-angle plate fixation of the patella was carried out after previous placement of a transverse central osteotomy. Operative time, intra-operative problems, degree of retropatellar arthritis (following Outerbridge), quality of reduction and existence of any intraarticular screw placement have been raised. In addition, lateral and anteroposterior radiographs of all specimens were made.Due to the high average age of 88.8 years no patella showed an unimpaired retropatellar articular surface and all were severely osteoporotic, which made a secure fixation of the reduction forceps during surgery difficult. The operation time averaged 49 minutes (range: 36-65). Although in postoperative X-rays the fracture gap between the fragments was still visible, the analysis of the retropatellar surface showed no residual articular step or dehiscence > 0.5 mm. Also in a total of 24 inserted screws not one intraarticular malposition was found. No intraoperative complications were noticed.Osteosynthesis of a medial third patella fracture with a bilateral fixed-angle plate-device is surgically and anatomically feasible without difficulties. Further studies have to depict whether the bilateral fixed-angle plate-osteosynthesis of the patella displays advantages over the established operative procedures.The patella is the largest sesamoid bone in the body and its subcutaneous location makes it susceptible to direct injury [1]. Only 1 % of all injuries to the human skeleton are patella fractures. Of those, only approximately one-third requires surgical attention [2,3]. The aim of surgical treatment in addition to the preservation of most of the kneecap, is anatomical reduction of the articular surface, followed by stable fixation, restoration of the extensor mechanism and early mobilization [4-11].Currently, the use of modified anterior tension wire with or with