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Knee Surgery, Sports Traumatology, Arthroscopy

Erschienen in:

01.11.2014 | Knee

Patellofemoral osteoarthritis after Insall’s proximal realignment for recurrent patellar dislocation

verfasst von: Karl F. Schüttler, Johannes Struewer, Philip P. Roessler, Markus Gesslein, Marga B. Rominger, Ewgeni Ziring, Turgay Efe

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 11/2014

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Abstract

Purpose

The aim of the present study was to retrospectively investigate the development of patellofemoral osteoarthritis after the historical Insall’s proximal realignment for patellar stabilisation in patients with recurrent patellar dislocation. Furthermore, risk factors for recurrent patellar dislocation and for patellofemoral osteoarthritis development were evaluated.

Methods

Forty-two patients underwent patellofemoral stabilising surgery by the historic Insall’s proximal realignment; they were evaluated with a mean follow-up period of 52 months. Plain radiography was used to document osteoarthritic changes by using the Iwano classification. MRIs obtained at the latest follow-up were evaluated for patellofemoral cartilage lesions. Univariate and multivariate logistic regression analyses were performed to evaluate the influence of trochlear dysplasia, tibial tubercle–trochlear groove distance and patellar height on redislocation. Pearson’s χ ² and the Spearman’s correlation tests were used to assess a possible correlation between trochlear dysplasia and patellar dislocation, as well as between instability and development of patellofemoral osteoarthritis.

Results

At the latest follow-up, plain radiographs showed a significant increase in patellofemoral osteoarthritis (grades II–IV according to the Iwano classification) in 18 patients (43 %) compared with 4 patients (10 %) at the time of surgery (P = 0.001). Patellofemoral cartilage lesions (grades II–IV) were detected in 18 patients (43 %) on MRI. Nine patients (21 %) had at least one incidence of redislocation at follow-up. Estimated redislocation-associated risk factors could not be determined. Trochlear dysplasia had a significant impact on patellofemoral osteoarthritis development (P = 0.001), whereas recurrent patellar instability had none (n.s.).

Conclusion

Insall’s proximal realignment technique leads to a significant progression of patellofemoral osteoarthritis. No risk factors for redislocation could be found; however, the presence of trochlear dysplasia did correlate with patellofemoral osteoarthritis.

Level of evidence

IV.

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Titel: Patellofemoral osteoarthritis after Insall’s proximal realignment for recurrent patellar dislocation
verfasst von: Karl F. Schüttler
Johannes Struewer
Philip P. Roessler
Markus Gesslein
Marga B. Rominger
Ewgeni Ziring
Turgay Efe
Publikationsdatum: 01.11.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 11/2014
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI: https://doi.org/10.1007/s00167-013-2485-0

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Patellofemoral osteoarthritis after Insall’s proximal realignment for recurrent patellar dislocation