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Injectable autologous chondrocyte implantation in acetabular cartilage defects: 2-year minimum clinical and MRI results

  • Orthopaedic Surgery
  • Published:
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Abstract

Introduction

Early results using injectable autologous chondrocyte implantation (ACI) for the treatment of full thickness acetabular cartilage defects have been promising. However, so far there is no information on radiological results after injectable ACI using spheroids. The purpose of this sturdy was to (1) investigate the quality of tissue repair on MRI and (2) investigate the correlation between the MRI results and clinical results at a minimum follow-up of 24 months after third generation ACI in full thickness acetabular cartilage defects. It was hypothesized that ACI shows good MRI results in patients with large full thickness acetabular cartilage defects 24 months after surgery. It was also hypothesized that there is a correlation between postoperative clinical and MRI morphological results at a minimum follow-up of 24 months.

Study design

Retrospective case series.

Materials and methods

Patients with ACI for full thickness acetabular cartilage defects > 2 cm2 were evaluated by preoperative and postoperative clinical scoring tools including the modified Harris Hip Score (mHHS), the International Hip Outcome Tool (iHOT-33), and the Subjective Hip Value (SHV) as well as a high resolution indirect arthro-MRI 24 months after surgery utilizing an identical imaging protocol for all patients. The magnetic resonance observation of cartilage repair tissue (MOCART) scoring system was used to classify the repair tissue on MRI. Demographic patient data was evaluated for influencing factors for pre- and postoperative clinical as well as radiological results.

Results

Thirty six consecutive patients (5 women/31 men, average age 32.9 years) had undergone two stage ACI procedure. The average size of the cartilage defect was 5.0 (2–6) cm2. The average follow-up was 29.9 (24–42) months. Four patients were not available for the final follow-up (follow-up rate 89%). The postoperative average MOCART score was 82.2 (± 14.2). MOCART score showed medium correlation of the item defect fill and the postoperative mHHS (r = 0.384, p = 0.043). There was no correlation of the other items or the total score with postoperative results. The patients showed significant improvement in the outcome measurements between preoperative and postoperative in the mHHS, the iHOT-33, and the SHV.

Conclusions

Despite the large acetabular cartilage defects included in this study, ACI showed good MRI results with complete defect fill in 87.5% after a minimum 24-month follow-up. Statistically significant correlation of MRI and clinical results could only be seen with the item defect fill. Further research with longer follow-up is needed to evaluate the long-term results of ACI in acetabular cartilage defects.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Herzogin Elisabeth Hospital, Leipziger Str. 24, 38124, Braunschweig, Germany

    David R. Krueger

  2. Departments of Radiology, Campus Virchow, Charité-Universitätsmedizin Berlin, Berlin, Germany

    Alexander D. J. Baur

  3. Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Berlin, Germany

    Carsten Perka

  4. Department of Trauma and Orthopaedic Surgery, BG Klinikum Unfallkrankenhaus Berlin, Berlin, Germany

    Joerg H. Schroeder

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  1. David R. Krueger
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  2. Alexander D. J. Baur
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Correspondence to David R. Krueger.

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Krueger, D.R., Baur, A.D.J., Perka, C. et al. Injectable autologous chondrocyte implantation in acetabular cartilage defects: 2-year minimum clinical and MRI results. Arch Orthop Trauma Surg 143, 739–747 (2023). https://doi.org/10.1007/s00402-021-04141-2

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