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Intra-articular remodelling of hamstring tendon grafts after anterior cruciate ligament reconstruction

Intra-articular remodelling of hamstring tendon grafts after anterior cruciate ligament reconstruction

Janssen RPA, Scheffler SU
Knee Surg Sports Traumatol Arthrosc (2014) 22:21022108

Purpose: A review 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 analyzing intra-articular free tendon graft remodeling.
Results: Animal and human in vitro and vivo research 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 postoperative regimens following hamstring ACL reconstruction.

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Dr. RPA Janssen
RPA Janssen Orthopedie B.V.
Coöperatie Orthopedie Groot Eindhoven
Orthopedisch Centrum Máxima
Máxima Medisch Centrum (MMC)

Bezoekadres MMC Eindhoven:
Ds. Th. Fliednerstraat 1
Ingang Zuid
5631 BM  Eindhoven
(Spreekuur en operaties)

Bezoekadres MMC Veldhoven:
De Run 4600
5504 DB  Veldhoven
(Spreekuur)

Postadres:
Postbus 90052
5600 PD  Eindhoven
Nederland

Tel.: 040 88 88 600
(Afspraken bureau Orthopedie)

Fax: 040 88 85 938
www.rpajanssen.nl

Externe bronnen:
Cooperatie Orthopedie Groot Eindhoven
Máxima Medisch Centrum
Orthopedisch Centrum Máxima
Sportklinisch Expertisecentrum
FC Kruisband
Nicky van Melick

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