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Cine MR imaging before and after realignment surgery for patellar maltracking — comparison with axial radiographs

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Abstract

Objective

Comparison of motion-triggered cine magnetic resonance (MR) imaging and conventional radiographs for the assessment of operative results of patellar realignment.

Subjects and methods

Fifteen patients with recurrent patellar dislocation or patellar subluxation were evaluated with conventional axial radiographs before and after realignment surgery by measuring the congruence angle (CA), lateral patellofemoral angle (LPFA), and lateral displacement (d). In eight patients the patellofemoral joint was additionally evaluated pre- and postoperatively with motion-triggered cine MR imaging by determining the bisect offset (BSO), lateral patellar displacement (LPD), and patellar tilt angle (PTA).

Results and conclusions

Significant differences between the pre- and postoperative measurements were found for all MR imaging parameters (BSO, LPD, PTA: p<0.01) but not for the conventional X-ray parameters (CA: p=0.70, LPFA: p=0.56; d: p=0.04). Motion-triggered cine MR imaging was superior to conventional tangential radiographs for assessing the effectiveness of patellar realignment surgery.

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Brossmann, J., Muhle, C., Büll, C.C. et al. Cine MR imaging before and after realignment surgery for patellar maltracking — comparison with axial radiographs. Skeletal Radiol. 24, 191–196 (1995). https://doi.org/10.1007/BF00228921

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