Clinical Report: When Does Quadriceps ACL Graft Mature?
Overview
Quadriceps tendon autografts show elevated MRI signal intensity at 3 and 6 months post-ACL reconstruction, normalizing by 12 months. The proximal portion of the graft exhibits the most significant changes during early healing.
Background
Understanding the maturation timeline of ACL grafts is crucial for optimizing patient recovery and return to sports. Quadriceps tendon autografts are increasingly used, yet their maturation patterns remain less understood compared to other graft types. This study provides insights into the signal intensity changes of QT autografts over the first year post-surgery.
Data Highlights
| Time Point | Signal Intensity Ratio |
|---|---|
| 3 months | Significantly higher than native ACL |
| 6 months | Significantly higher than native ACL |
| 12 months | No significant difference from native ACL |
Key Findings
- Significant elevation in signal intensity of QT autografts at 3 and 6 months post-surgery.
- By 12 months, signal intensity of QT autografts approached that of the native ACL.
- Proximal segments of the graft showed the most pronounced signal intensity changes.
- Study involved 19 young amateur athletes aged 13 to 19 years.
- Signal intensity ratios were calculated to account for variability in MRI scans.
- Limitations included lack of histologic validation and small sample size.
Clinical Implications
Clinicians should consider the maturation timeline of quadriceps tendon autografts when planning rehabilitation and return-to-sport protocols. MRI findings should be interpreted cautiously, as they may not fully correlate with functional recovery or graft maturity.
Conclusion
Reiterate the importance of monitoring not just signal intensity but also functional recovery.
References
- Smith DR, et al., Orthopaedic Journal of Sports Medicine, 2026 -- Twelve-Month Maturation Timeline of Quadriceps Tendon Autograft Signal Intensity Ratio After ACL Reconstruction Surgery Using Magnetic Resonance Imaging
- Knee Surgery, Sports Traumatology, Arthroscopy — Changes in Hamstring Tendon Graft Structure Within the Joint Following Anterior Cruciate Ligament Reconstruction
- Knee Surgery, Sports Traumatology, Arthroscopy — Hamstring tendon autografts exhibit incomplete maturity six months after anterior cruciate ligament reconstruction surgery.
- Knee Surgery, Sports Traumatology, Arthroscopy — Quadriceps Autograft: An Effective Graft Option for Arthroscopic ACL Reconstruction in Patients Aged 50 and Older
- Comparative assessment of graft maturity after anterior cruciate ligament reconstruction using different graft types: a systematic review - PMC
- Enhancing Graft Healing and Mitigating Tunnel Widening in Anterior Cruciate Ligament Reconstruction Through Periosteal Wrapping of Hamstring Tendon Autografts
- AAOS Anterior Cruciate Ligament Injuries
- Twelve-Month Maturation Timeline of Quadriceps Tendon Autograft Signal Intensity Ratio After ACL Reconstruction Surgery Using Magnetic Resonance Imaging
- Comparative assessment of graft maturity after anterior cruciate ligament reconstruction using different graft types: a systematic review - PMC
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