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Prospective evaluation of anatomic patellofemoral inlay resurfacing: clinical, radiographic, and sports-related results after 24 months

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To prospectively evaluate the clinical, radiographic, and sports-related outcomes at 24 months after isolated and combined patellofemoral inlay resurfacing (PFIR).

Methods

Between 2009 and 2010, 29 consecutive patients with patellofemoral osteoarthritis (OA) were treated with the HemiCAP® Wave Patellofemoral Resurfacing System (Arthrosurface, Franklin, MA, USA). Based on preoperative findings, patients were divided into two groups: group I, isolated PFIR (n = 20); and group II, combined PFIR with concomitant procedures to address patellofemoral instability, patellofemoral malalignment, and tibiofemoral malalignment (n = 9). Patients were evaluated preoperatively and at 24 months postoperatively. Clinical outcomes included WOMAC, subjective IKDC, Pain VAS, Tegner activity score, and a self-designed sports questionnaire. Kellgren–Lawrence grading was used to assess progression of tibiofemoral OA. The Caton–Deschamps Index was used to assess differences in patellar height.

Results

Twenty-seven patients (93 %) were available for 24-month follow-up. Eighty-one per cent of the patients were either satisfied or very satisfied with the overall outcome. Significant improvements in the WOMAC, subjective IKDC, and Pain VAS were seen in the overall patient cohort and in both subgroups. The median Tegner score and sports frequency showed a significant increase in the overall patient cohort and in group II. The number of sports disciplines increased significantly in both subgroups. No significant progression of tibiofemoral OA or changes in patellar height were observed.

Conclusion

Patellofemoral inlay resurfacing is an effective and safe procedure in patients with symptomatic patellofemoral OA. Significant improvements in functional scores and sports activity were found after both isolated and combined procedures.

Level of evidence

Prospective case series, Level III.

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Conflict of interest

A.B. Imhoff and P.B. Schöttle are consultants for Arthrosurface. The company had no influence on study design, data collection, and interpretation of the results or the final manuscript.

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Authors and Affiliations

  1. Department for Orthopaedic Sports Medicine, Technical University Munich, Ismaninger Str. 22, 81675, Munich, Germany

    Andreas B. Imhoff, Matthias J. Feucht, Gebhart Meidinger, Philip B. Schöttle & Matthias Cotic

  2. Department of Trauma and Orthopaedic Surgery, Trauma Center Murnau, Murnau, Germany

    Gebhart Meidinger

  3. Department of Orthopaedics and Trauma Surgery, Isar Medical Center, Munich, Germany

    Philip B. Schöttle

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  1. Andreas B. Imhoff
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  2. Matthias J. Feucht
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  3. Gebhart Meidinger
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  5. Matthias Cotic
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Correspondence to Andreas B. Imhoff.

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Andreas B. Imhoff and Matthias J. Feucht have contributed equally to this work and share first authorship.

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Imhoff, A.B., Feucht, M.J., Meidinger, G. et al. Prospective evaluation of anatomic patellofemoral inlay resurfacing: clinical, radiographic, and sports-related results after 24 months. Knee Surg Sports Traumatol Arthrosc 23, 1299–1307 (2015). https://doi.org/10.1007/s00167-013-2786-3

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