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Complex Tibial Plateau Fractures Treated by Hybrid External Fixation System

A correlation of followup computed tomography derived quality of reduction with clinical results

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Abstract

Background

Tibial plateau fractures are common due to high energy injuries. The principles of treatment include respect for the soft tissues, restoring the congruity of the articular surface and reduction of the anatomic alignment of the lower limb to enable early movement of the knee joint. There are various surgical fixation methods that can achieve these principles of treatment. Recognition of the particular fracture pattern is important, as this guides the surgical approach required in order to adequately stabilize the fracture. This study evaluates the results of the combined treatment of external fixator and limited internal fixation along with the advantages using postoperative computed tomography (CT) scan after implant removal.

Materials and Methods

55 patients with a mean age of 42 years (range 17–65 years) with tibial plateau fracture, were managed in our institution between October 2010 and September 2013., Twenty fractures were classified as Schatzker VI and 35 as Schatzker V. There were 8 open fractures (2 Gustilo Anderson 3A and 6 Gustilo Anderson 2). All fractures were treated with closed reduction and hybrid external fixation (n = 21/38.2%) or with minimal open reduction internal fixation and a hybrid system (n = 34/61.8%). After the removal of the fixators, CT-scan was programmed for all the cases, for correlation with the results. At final followup, the American Knee Society Score (AKSS) was administered.

Results

All patients were evaluated with a minimum of 12 months (range 12–21 months) followup. Average time to union was 15.5 weeks (range 13–19 weeks). The postoperative joint congruity as evaluated in the postoperative CT-scan was <2 mm of articular step-off in 8 patients (14.5%), between 2 and 4 mm in 18 patients (32.7%) and over 4 mm in 29 (52.7%). The injured limb mechanical axis was restored within 5° compared to the contralateral limb in 36 cases (65%) and with an angulation >5° in 19 cases (35%). Patients with residual joint depression <3.5 mm had a 95% chance of having excellent AKSS knee score results and 80% chance of having excellent AKSS function scores. On the other hand, residual joint depression of >4.5 mm displayed a 100% chance of getting poor-fair scores both in AKSS knee and AKSS function score. The association of a postoperative mechanical axis within 5° of the contralateral limb and improved knee scores was statistically significant for the AKSS function and total scores but not for the AKSS knee score. The AKSS was negatively correlated with postoperative joint depression magnitude which was statistically significant. Only the amount of joint collapse was verified as a prognostic factor in a multivariate logistic regression analysis.

Conclusions

The postoperative CT-scan shows important information about bone healing, and an exact image of the reduction and the shaft alignment. Postoperative radiographs may have led to an underestimation of the degree of residual displacement. On the contrary, CT-scan demonstrates the exact grade of articular displacement and depending on CT-scan results one can better manage the postoperative rehabilitation.

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Authors and Affiliations

  1. Fourth Department of Orthopaedics and Traumatology, KAT Hospital, Kifissia, 2 Nikis Street, 145 61, Athens, Greece

    Spyridon P. Galanakos, Stamatios A. Papadakis & George A. Macheras

  2. First Orthopaedic Department, Gennimatas General Hospital, Cholargos, Greece

    Konstantinos Kateros & Georgios Kyriakopoulos

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  1. Konstantinos Kateros
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  2. Spyridon P. Galanakos
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  3. Georgios Kyriakopoulos
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  4. Stamatios A. Papadakis
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  5. George A. Macheras
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Correspondence to Spyridon P. Galanakos.

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Kateros, K., Galanakos, S.P., Kyriakopoulos, G. et al. Complex Tibial Plateau Fractures Treated by Hybrid External Fixation System. IJOO 52, 161–169 (2018). https://doi.org/10.4103/ortho.IJOrtho_300_16

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