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Physicochemical decellularization of composite flexor tendon-bone interface grafts.

Joel A Bronstein¹, Colin Y L Woon, Simon Farnebo

¹Stanford, Calif. From the Section of Plastic Surgery, VA Palo Alto Health Care System; and the Division of Plastic Surgery, Stanford University Medical Center.

Plastic and Reconstructive Surgery

|June 29, 2013

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Ultrasonication combined with chemical treatments effectively decellularized tendon-bone grafts, significantly reducing cells while preserving tensile strength for potential use in healing extremity injuries.

Area of Science:

Biomaterials Science
Tissue Engineering
Orthopedic Surgery

Background:

Tendon-bone injuries pose significant clinical challenges.
Decellularization of allografts is crucial to minimize immune rejection.
Composite grafts are difficult to decellularize due to cellular infiltration between tissues.

Purpose of the Study:

To optimize the decellularization process for tendon-bone interface allografts.
To evaluate the efficacy of combined physical (ultrasonication) and chemical methods.
To assess the impact of decellularization on graft cellularity and mechanical integrity.

Main Methods:

Human flexor digitorum profundus tendons with distal phalanges were used.
Grafts were divided into control, chemical-only, low-power ultrasonication + chemical, and high-power ultrasonication + chemical groups.

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Decellularization was assessed via histology, cell counts, and MHC I staining; tensile strength was measured.

Main Results:

Physicochemical treatments (ultrasonication + chemical) significantly reduced cell counts (p < 0.001).
Substantial reduction in major histocompatibility complex I molecules was observed.
Decellularized grafts maintained ultimate tensile load compared to controls (p > 0.5).

Conclusions:

Physicochemical decellularization effectively removes cells and MHC I from tendon-bone grafts.
This method preserves the mechanical properties of the grafts.
Decellularized composite scaffolds show promise for reconstructing tendon-bone defects.