Condylar Buttress Plate versus Fixed Angle Condylar Blade Plate versus Dynamic Condylar Screw for Supracondylar Intra-Articular Distal Femoral Fractures

Abstract

Purpose. To compare outcomes of 3 fixation techniques for intra-articular distal femoral fractures. Methods. Records of 59 men and 49 women aged 16 to 80 (mean, 47) years who underwent internal fixation for 116 type-C (complete intra-articular) distal femoral fractures were retrospectively reviewed. According to the AO classification, 25 fractures were type C1 (23 closed and 2 open), 71 type C2 (69 closed and 2 open), and 20 type C3 (16 closed and 4 open). Based on implant availability at the time, all surgeries were performed by a single surgeon using a condylar buttress plate (n=38), a fixed angle (95°) condylar blade plate (n=24), or a dynamic condylar screw (n=54). The mean follow-up period was 11 (range, 4–19) years. At the latest follow-up, functional outcome was classified according to Schatzker and Lambert criteria. Results. Functional outcomes were excellent in 64 (55%) of the fractures, good in 37 (32%), moderate in 9 (8%), and poor in 6 (5%). Outcomes in patients treated by the dynamic condylar screw were significantly superior to those treated by the condylar buttress plate (p=0.016) or condylar blade plate (p=0.001). Good-to-excellent results were achieved in 96% vs 84% vs 71% of these patients, respectively. Complication rates were lower in the dynamic condylar screw group than the other 2 groups (pseudarthrosis, 5% vs 11% vs 25%; varus deformity, 4% vs 26% vs 25%; knee stiffness, 0% vs 5% vs 8%, respectively). No implant failure was encountered. Conclusion. Dynamic condylar screw fixation for distal femoral fractures achieves better functional outcomes and lower complication rates.