Patellofemoral Update
Patellofemoral Update
June 05, 2019
1 min read

Patella alta, preoperative positive J-sign may be risk factors for failure after MPFL reconstruction

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Isolated, medial patellofemoral ligament reconstruction may be safe and efficient for the treatment of recurrent patellar instability, according to recently published results.

Researchers identified 211 patients who underwent medial patellofemoral ligament reconstruction. The mean follow-up was 5.8 years. The Kujala score assessment of patellar tracking and radiographic features, such as trochlear dysplasia according to Dejour classification, patellar height with the Caton-Deschamps index, tibial tubercle-trochlear groove distance and patellar tilt, were included in the preoperative assessment. Postoperatively, investigators assessed the Kujala score. A postoperative patellar dislocation or surgical revision for recurrent patellar instability was considered a failure.

Results showed a position J-sign in 27% of patients. There were 93% of patients with trochlear dysplasia. The mean Caton-Deschamps was 1.2. The mean tibial tubercle-trochlear groove distance was 15 mm, and the mean patellar tilt was 23°. The mean Kujala score improved from 56.1 preoperatively to 88.8 postoperatively.

There were 10 failures reported which needed surgical revision due to recurrent patellar instability. Univariate and multivariate analyses demonstrated patellar alta and a preoperative positive J-sign were preoperative risk factors for failure. – by Monica Jaramillo

Disclosures: Erickson reports he receives education payments from Smith & Nephew and education and hospitality payments from DePuy. Please see the full study for a list of all other authors’ relevant financial disclosures.