Successful human long-term application of in situ bone tissue engineering

Raymund E Horch, Justus P Beier, Ulrich Kneser, Andreas Arkudas, Raymund E Horch, Justus P Beier, Ulrich Kneser, Andreas Arkudas

Abstract

Tissue Engineering (TE) and Regenerative Medicine (RM) have gained much popularity because of the tremendous prospects for the care of patients with tissue and organ defects. To overcome the common problem of donor-site morbidity of standard autologous bone grafts, we successfully combined tissue engineering techniques for the first time with the arteriovenous loop model to generate vascularized large bone grafts. We present two cases of large bone defects after debridement of an osteomyelitis. One of the defects was localized in the radius and one in the tibia. For osseus reconstruction, arteriovenous loops were created as vascular axis, which were placed in the bony defects. In case 1, the bone generation was achieved using cancellous bone from the iliac crest and fibrin glue and in case 2 using a clinically approved β-tricalciumphosphate/hydroxyapatite (HA), fibrin glue and directly auto-transplanted bone marrow aspirate from the iliac crest. The following post-operative courses were uneventful. The final examinations took place after 36 and 72 months after the initial operations. Computer tomogrphy (CT), membrane resonance imaging (MRI) and doppler ultrasound revealed patent arterio-venous (AV) loops in the bone grafts as well as completely healed bone defects. The patients were pain-free with normal ranges of motion. This is the first study demonstrating successfully axially vascularized in situ tissue engineered bone generation in large bone defects in a clinical scenario using the arteriovenous loop model without creation of a significant donor-site defect utilizing TE and RM techniques in human patients with long-term stability.

Keywords: arteriovenous loop; clinical translation; human application; large bone defect; long term success; regenerative medicine; tissue engineering.

© 2014 The Authors. Journal of Cellular and Molecular Medicine published by John Wiley & Sons Ltd and Foundation for Cellular and Molecular Medicine.

Figures

Fig. 1
Fig. 1
Pre-operative X-ray of the wrist (case 2) showing cystic formations at the distal radius. (A) Posteroanterior radiograph. (B) Lateral radiograph.
Fig. 2
Fig. 2
Pre-operative MRI of the lower arm (case 2) showing cystic formations at the distal radius consistent with a giant cell carcinoma. (A) Coronar reconstruction. (B) Sagittal reconstruction.
Fig. 3
Fig. 3
Preparation of the bone construct (case 2): After creation of the bone defect (A) the bone construct was composed of a clinically approved β-tricalciumphosphate/hydroxyapatite matrix (+), fibrin glue (#) and directly auto-transplanted bone marrow aspirate from the right iliac crest (&) (B). An arteriovenous loop was created by a vein graft (*) from the lower arm interposed between the radial artery on the volar site (end-to-side microsurgical anastomosis) and the cephalic vein (end-to-end) at the dorsal site of the lower arm penetrating the bone construct (C).
Fig. 4
Fig. 4
Magnetic resonance angiography 14-month post-operative (case 2) showing a patent arteriovenous loop as well as a completely healed bone defect in the radius. (A) Palmar view. (B) Dorsal view. Arrows: arteriovenous loop.
Fig. 5
Fig. 5
CT scan 14-month post-operative (case 2) demonstrating a completely healed bone defect in the distal radius. (A) Coronar reconstruction. (B) Sagittal reconstruction.
Fig. 6
Fig. 6
14 months after bony reconstruction, patient showed full range of motion in the hand (case 2).

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