J Knee Surg 2021; 34(08): 906-912
DOI: 10.1055/s-0039-3402031
Original Article

Bilateral Hidden Isokinetic Quadriceps Performance before and after MPFL Reconstruction in Pediatric Patients

Krzysztof Małecki*
1   Clinic of Orthopaedic and Traumatology, Polish Mother's Memorial Hospital Research Institute, Lodz, Poland
,
Kryspin Niedzielski*
1   Clinic of Orthopaedic and Traumatology, Polish Mother's Memorial Hospital Research Institute, Lodz, Poland
,
Paweł Flont
1   Clinic of Orthopaedic and Traumatology, Polish Mother's Memorial Hospital Research Institute, Lodz, Poland
,
Anna Fabis-Strobin
1   Clinic of Orthopaedic and Traumatology, Polish Mother's Memorial Hospital Research Institute, Lodz, Poland
,
Jarosław Fabis
2   Department of Arthroscopy, Minimally Invasive Surgery and Sports Traumatology, Medical University of Lodz, Lodz, Poland
› Author Affiliations

Abstract

We perform prospective study to evaluate the isokinetic performance of quadriceps before and 1 year after medial patella-femoral ligament (MPFL) reconstruction with the adductor magnus tendon in the case of recurrent patellar dislocation. The present study is the first to describe the isokinetic function of the quadriceps of the involved and uninvolved extremity, in such a wide range. The MPFL is a crucial passive stabilizer of patella and, along with the conditions of the anatomical shape of the femoral-patellar joint and the function of quadriceps, influences the overall patellar stability. However, only a few studies have examined indirectly or directly the function of quadriceps. A total of 27 patients (average age at surgery was 15.8 years) with recurrent monolateral patellar dislocation were treated with MPFL reconstruction using the adductor magnus tendon. In the study group, healthy and operated quadriceps were evaluated for the following parameters at the velocities of 60 and 180 deg/s before surgery and in the follow-up examination: peak torque, peak torque to body weight, time to peak torque, peak torque angle, torque in 30 degree of the knee flexion (TQ 30 degree), and the torque in the first 180 milliseconds (TQ 180). Preoperative patellar instability and its normalization after MPFL reconstruction have no impact on the isokinetic quadriceps index value which depends on the time and degree of inactivity as well as implementation of appropriate physiotherapy. The increase in the quadriceps muscle strength of a healthy limb is responsible for the persistence of muscle isokinetic imbalance after MPFL reconstruction in pediatric patients. This is a level 2b study.

Note

The study was approved by Polish Mother's Memorial Hospital Review Board (approval issue date: October 23, 2010).


* These authors contributed equally to the article.




Publication History

Received: 23 January 2019

Accepted: 10 November 2019

Article published online:
06 January 2020

© 2020. Thieme. All rights reserved.

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