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Prevailing disagreement in the treatment of complex patellar instability cases: an online expert survey of the AGA Knee–Patellofemoral Committee

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To evaluate the current state of knowledge and potential controversies in the treatment of patellofemoral instability among orthopaedic/trauma surgeons in the German-speaking countries.

Methods

An online survey consisting of 32 questions and three fictitious cases was sent to members of the AGA—Society for Arthroscopy and Joint Surgery. Surgeons were defined by our senior authors as high-volume or low-volume surgeons, depending on the number of their cases. The treatment of 25% of patients with patellofemoral instability and/or the performance of 50 patellofemoral instability cases per year distinguishes high- from low-volume surgeons in this study.

Results

The online questionnaire was completed by 541 experienced knee surgeons from Germany (78%), Austria (10.9%), Switzerland (10.4%) and other countries (0.7%). Most surgeons prefer MPFL reconstruction as surgical intervention in patients with recurrent patellar instability (64–81%). Sixty percent of high-volume surgeons as compared to 21.8% of low-volume surgeons have ever performed a trochleoplasty. Of the overall respondents, 25% would not perform any surgical treatment on adolescents with patellar instability and an open growth plate. Of all responding surgeons, 95% would not treat patellofemoral instability with an isolated lateral release. This corresponds to recent literature showing poor outcome of its strictly isolated application.

Conclusion

This study provides an overview of the current management of acute and recurrent patellofemoral instability in the German-speaking countries. Results show the surgeons' awareness for highly demanding surgical possibilities for complex patellar instability cases. However, disagreement among surgeons still prevails when it comes to selecting individual multimodal treatment options. This highlights the need for treatment guidelines and algorithms for patellofemoral instability.

Level of evidence

V.

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Acknowledgements

The authors specially thank the entire AGA Knee–Patellofemoral Committee (in particular: Priv.-Doz. Dr. med. Peter Balcarek, Prof. Dr. med. Christoph Becher, Priv.-Doz. Dr. med. René El Attal, PD Dr. med. univ. Armin Keshmiri, Priv.-Doz. Dr. med. Geert Pagenstert, Dr. med. Gerd Seitlinger, Dr. med. Daniel Wagner) for supporting this study. The authors hereby also want to thank all AGA-members who participated in this survey. A special gratitude goes out to Ms. Eva-Maria Pinz who managed the online distribution of the questionnaire.

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Authors and Affiliations

  1. Medical University of Vienna, Spitalgasse 23, 1090, Vienna, Austria

    A. Geierlehner

  2. Department of Orthopaedic Surgery, Medical University of Innsbruck, Innsbruck, Austria

    M. Liebensteiner

  3. Knee and Health Institute Munich GbR, Frauenplatz 7, 80331, Munich, Germany

    P. Schöttle

  4. Orthopädie und Sportchirurgie Dr. Dirisamer/Dr. Patsch, Schloss Puchenau, Karl-Leitl-Str. 1, 4048, Linz-Puchenau, Austria

    F. Dirisamer

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  1. A. Geierlehner
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Correspondence to A. Geierlehner.

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Conflict of interest

Prof. Dr. Med. Philip Schöttle declares having royalty agreements with Arthrex, Inc. and Arthrosurface. Prof. Dr. Med. Philip Schöttle and Dr. Dirisamer act as consultants for Arthrex Inc. All other authors declare having no conflict of interest.

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The study was approved by the Ethics Committee of the Medical University of Vienna, Austria.

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Geierlehner, A., Liebensteiner, M., Schöttle, P. et al. Prevailing disagreement in the treatment of complex patellar instability cases: an online expert survey of the AGA Knee–Patellofemoral Committee. Knee Surg Sports Traumatol Arthrosc 28, 2697–2705 (2020). https://doi.org/10.1007/s00167-020-05936-3

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