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Athymic Rat Model for Evaluation of Engineered Anterior Cruciate Ligament Grafts
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Predicting the Hamstring Graft Size for ACL Reconstruction Using a 3D Tendon Model in Preoperative MRI.

Andreas Frodl1, Moritz Mayr1, Markus Siegel1

  • 1Department of Orthopedics and Traumatology, Freiburg University Hospital, 79106 Freiburg, Germany.

Journal of Clinical Medicine
|March 27, 2025
PubMed
Summary
This summary is machine-generated.

Magnetic resonance imaging (MRI) can reliably estimate hamstring graft diameter for ACL reconstruction. The 10 mm-0 mm segment above the joint line on MRI shows the strongest correlation with surgical graft size.

Keywords:
Arthroscopic surgeryanterior cruciate ligamentgraft sizemagnetic resonance imaging

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Biomedical Engineering

Background:

  • Anterior cruciate ligament (ACL) ruptures are common in athletes.
  • Accurate graft diameter estimation is crucial for ACL reconstruction surgery.
  • Magnetic resonance imaging (MRI) offers a potential method for pre-operative graft assessment.

Purpose of the Study:

  • To evaluate the reliability of MRI-based 3D segmentation of hamstring tendons for estimating graft diameter.
  • To determine the optimal MRI segment for predicting graft size.
  • To correlate pre-operative MRI measurements with intra-operative graft diameter.

Main Methods:

  • Retrospective analysis of 32 patients undergoing ACL reconstruction.
  • 3D segmentation of gracilis tendon (GT) and semitendinosus tendon (ST) using MRI.
  • Calculation of cross-sectional area (CSA) across six specific tendon segments.
  • Correlation of mean CSA with surgically measured graft diameter.

Main Results:

  • Significant correlation found between hamstring tendon CSA and graft diameter across all segments.
  • The 10 mm-0 mm segment above the joint line demonstrated the strongest correlation (r = 0.552).
  • Observed differences in CSA between male and female patients.

Conclusions:

  • MRI-based 3D segmentation of ST and GT provides a reliable method for pre-operative graft diameter estimation.
  • The 10 mm-0 mm segment is an ideal reference point for graft planning in ACL reconstruction.
  • This technique aids in optimizing surgical outcomes by ensuring appropriate graft size.