Intra‐articular remodelling of hamstring tendon grafts after anterior cruciate ligament reconstruction
Open accessAbstract
Purpose: A summary is provided on the existing knowledge about the specific healing phases of the intra‐articular hamstring tendon graft used for ACL reconstruction. Differences between human and animal in vivo studies are explained, and implications for the postoperative time period are laid out. Methods: A systematic review of the existing literature was performed on the topic of tendon remodelling of hamstring grafts in ACL reconstruction using Medline database. Publications between 1982 and 2012 were included. Special focus was directed on in vivo human and animal studies analysing intra‐articular free tendon graft remodelling. Results: Animal and human in vitro and vivo researches have demonstrated three characteristic stages of graft healing after ACL reconstruction: an early graft healing phase with central graft necrosis and hypocellularity and no detectable revascularization of the graft tissue, followed by a phase of proliferation, the time of most intensive remodelling and revascularization and finally, a ligamentization phase with characteristic restructuring of the graft towards the properties of the intact ACL. However, a full restoration of either the biological or biomechanical properties of the intact ACL is not achieved. Conclusion: Significant knowledge on human cruciate ligament remodelling has been added in the understanding of the processes during the course of graft healing. Most importantly, the remodelling process in humans is prolonged compared to animal studies. While today´s rehabilitation protocols are often extrapolated from findings of animal in vivo healing studies, current findings of human in vivo healing studies might require new post‐operative regimens following hamstring ACL reconstruction.
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In the early postoperative period, limited ingrowth of newly regenerated connective tissue in the knee cavity restricted ligament regeneration.
“in the early postoperative period, limited ingrowth of the newly regenerated connective tissue in the knee cavity restricted ligament regeneration, and bone tissue in the bone tunnel disrupted graft–bone healing [13, 14].”
From Bone Mesenchymal Stem Cells Contribute to Ligament Regeneration and Graft–Bone Healing after Anterior Cruciate Ligament Reconstruction with Silk–Collagen Scaffold (2021) · cites this paper as [13]
The ‘Early graft healing phase’ section (page unavailable) reports no graft revascularization and says insufficient biological graft incorporation is a weak point in the first four postoperative weeks. It does not say that limited ingrowth of newly regenerated connective tissue in the knee cavity restricts ligament regeneration. (LLM, conf=0.74)
Experimental — accuracy not yet measuredIn the early postoperative period, bone tissue in the bone tunnel disrupted graft-bone healing.
“in the early postoperative period, limited ingrowth of the newly regenerated connective tissue in the knee cavity restricted ligament regeneration, and bone tissue in the bone tunnel disrupted graft–bone healing [13, 14].”
From Bone Mesenchymal Stem Cells Contribute to Ligament Regeneration and Graft–Bone Healing after Anterior Cruciate Ligament Reconstruction with Silk–Collagen Scaffold (2021) · cites this paper as [13]
The Early graft healing phase section (page not specified) says that insufficient biological graft incorporation is a weak point at 2–4 weeks, with failures by graft pullout. It does not say that bone tissue in the tunnel disrupted graft–bone healing; the proposed cause is unsupported. (LLM, conf=0.83)
Experimental — accuracy not yet measuredThe mechanical properties of an implanted graft, regardless of graft type, do not return to normal after anterior cruciate ligament reconstruction surgery.
“However, the mechanical properties of the implanted graft, regardless of graft type, do not return to normal after ACLR surgery [3–5].”
From A new biological enhancement therapy for anterior cruciate ligament reconstruction: the preclinical proof of anterior cruciate ligament reconstruction with tendon graft reseeded with autologous anterior cruciate ligament-derived cells (2025) · cites this paper as [3]
The Conclusion says hamstring tendon grafts adapt toward the intact ACL without fully restoring its mechanical properties. But the paper focuses on hamstring grafts, and the Human hamstring remodelling and rehabilitation section says no final conclusion can be drawn about mechanical strength in humans. It therefore does not establish the claim for every graft type after ACL reconstruction. (LLM, conf=0.87)
Experimental — accuracy not yet measuredRestoration of the mechanical strength of an intact anterior cruciate ligament is not achieved even after 2 years after anterior cruciate ligament reconstruction.
“Although the implanted graft reportedly undergoes remodeling after 1 year, restoration of the mechanical strength of an intact ACL is not achieved even after 2 years [3, 4].”
From A new biological enhancement therapy for anterior cruciate ligament reconstruction: the preclinical proof of anterior cruciate ligament reconstruction with tendon graft reseeded with autologous anterior cruciate ligament-derived cells (2025) · cites this paper as [3]
The Proliferation phase section says full mechanical strength was not restored even after two years in any in vivo model, in the context of animal studies. The Human hamstring remodelling and rehabilitation section says no final conclusion can be drawn about graft strength in humans because it cannot be measured in vivo. The claim omits that limitation and presents the two-year finding as applying generally after ACL reconstruction. (LLM, conf=0.88)
Experimental — accuracy not yet measuredA tendon graft is often used to perform ACLR; however, the graft undergoes necrosis early in the healing process, and deterioration occurs through the proliferation of the extrinsic fibroblasts in place of graft necrosis, resulting in overexpression of type III collagen.
“A tendon graft is often used to perform ACLR; however, the graft undergoes necrosis early in the healing process, and deterioration occurs through the proliferation of the extrinsic fibroblasts in place of graft necrosis, resulting in overexpression of type III collagen [3, 11].”
From A new biological enhancement therapy for anterior cruciate ligament reconstruction: the preclinical proof of anterior cruciate ligament reconstruction with tendon graft reseeded with autologous anterior cruciate ligament-derived cells (2025) · cites this paper as [3]
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Tulloch, S. J., Devitt, B. M., Norsworthy, C. J., & Mow, C. (2019) · Knee Surgery, Sports Traumatology, Arthroscopy · doi:10.1007/s00167-018-5280-0 · Cited by 41 · see citing works
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“However, in the early postoperative period, limited ingrowth of the newly regenerated connective tissue in the knee cavity restricted ligament regeneration, and bone tissue in the bone tunnel disrupted graft–bone healing [13, 14].”
BackgroundPark, J., Jo, S., Lee, M.-K., Kim, T.-H., Sung, I.-H., & Lee, J. K. (2022) · Bone & Joint Research · doi:10.1302/2046-3758.1111.bjr-2021-0548.r2 · Cited by 12 · see citing works
Park, J., Soh, H., Jang, Y.-K., Lee, Y. S., Lee, M.-K., Kim, H., Kim, T.-H., Alkhelaifi, K., Kim, T.-J., & Lee, J. K. (2025) · Stem Cell Research & Therapy · doi:10.1186/s13287-025-04760-1 · Cited by 3 · see citing works
- Authors
- Janssen, R. P. A., & Scheffler, S. U.
- Affiliations
- Máxima Medisch Centrum (NL)
- Chirurgisch Orthopädischer PraxisVerbund (COPV) Breitenbachplatz 8 14195 Berlin Germany
- Corresponding author
- Janssen, Rob P. A.
- Venue
- Knee Surgery, Sports Traumatology, Arthroscopy
- Publisher
- Wiley
- Published
- 2013-08-27
- Volume
- 22
- Issue
- 9
- Pages
- 2102-2108
- ISSN
- 0942-2056 (ISSN-L)
- 1433-7347
- PMC
- PMC4142140
- OpenAlex
- W2023416936
- Cited by
- 225
- References
- 2
- Citations by year
- 2026: 14 · 2025: 20 · 2024: 18 · 2023: 23 · 2022: 23 · 2021: 26 · 2020: 22 · 2019: 19 · 2018: 13 · 2017: 14 · 2016: 19 · 2015: 8 · 2014: 6
- FWCI
- 1.95
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Knee Surgery Sports Traumatology Arthroscopy (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Surgery › Knee injuries and reconstruction techniques
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Tendon Structure and Treatment
- Health Sciences › Medicine › Urology › Periodontal Regeneration and Treatments
- Keywords
- anterior cruciate ligament reconstruction, hamstring tendon graft, graft necrosis, graft revascularization, ligamentization, postoperative rehabilitation, graft mechanical properties
- MeSH terms
- Anterior Cruciate Ligament Injuries, Animals, Humans, Knee Joint, Tendons, Wound Healing, Anterior Cruciate Ligament, Transplants, Anterior Cruciate Ligament Reconstruction
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