Maderbacher, Guenther and Schaumburger, Jens and Baier, Clemens and Zeman, Florian and Springorum, Hans-Robert and Birkenbach, Anne-Maria and Grifka, Joachim and Keshmiri, Armin (2016) Appropriate sagittal femoral component alignment cannot be ensured by intramedullary alignment rods. KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, 24 (8). pp. 2453-2460. ISSN 0942-2056, 1433-7347
Full text not available from this repository. (Request a copy)Abstract
The intraoperative sagittal cutting block alignment when intramedullary alignment rods are used was investigated. Its absolute orthogonal orientation in relation to the mechanical femoral axis should be analysed. It was hypothesized that (1) alignment rods do not ensure a desired deviation within a range between 0A degrees and 3A degrees flexion as it has been shown to be favourable for clinical and functional outcome. Further, the degree of flexion cannot be (2) foreseen by the surgeon or (3) estimated by clinical or radiological parameters. Forty knees allocated to total knee arthroplasty were included. The distal femoral cutting block was aligned using an intramedullary rod. By means of a navigation device, the sagittal alignment of the cutting block in degrees of flexion was measured. The mean measured flexion of the cutting block was 4.4A degrees (3.6 SD). Twenty-five per cent (10/40) of the values were within a corridor between 0A degrees and 3A degrees of flexion. The mean difference between expected and measured flexion was -1.5A degrees (-7.6 to 4.7 95 % limits of agreement). The dorsoventral diameter of the distal femur showed a significant influence on measured flexion (R (2) = 0.112, p = 0.035). Intramedullary alignment rods used in the present study do not ensure a distal cutting block alignment between 0A degrees and 3A degrees of flexion in relation to the femoral mechanical axis. The extent of flexion could not be foreseen either by the surgeon. The dorsoventral diameter of the distal femur correlated with measured flexion. However, only limited data is available on influence of femoral component flexion on implant failure or clinical and functional outcome. Diagnostic study, Level II.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TOTAL KNEE ARTHROPLASTY; RANDOMIZED CONTROLLED-TRIAL; NAVIGATION SYSTEM; ACCURACY; SURGERY; EXTRAMEDULLARY; REPLACEMENT; CURVATURE; FRACTURES; SURVIVAL; TKA; Total knee arthroplasty; Alignment; Femoral component flexion; Intramedullary alignment rods |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Orthopädie Medicine > Zentren des Universitätsklinikums Regensburg > Zentrum für Klinische Studien |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Apr 2019 07:14 |
| Last Modified: | 08 Apr 2019 07:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3582 |
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