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Published in: BMC Musculoskeletal Disorders 1/2019

Open Access 01-12-2019 | Research article

Topical cutaneous application of carbon dioxide via a hydrogel for improved fracture repair: results of phase I clinical safety trial

Authors: Takahiro Niikura, Takashi Iwakura, Takashi Omori, Sang Yang Lee, Yoshitada Sakai, Toshihiro Akisue, Keisuke Oe, Tomoaki Fukui, Takehiko Matsushita, Tomoyuki Matsumoto, Ryosuke Kuroda

Published in: BMC Musculoskeletal Disorders | Issue 1/2019

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Abstract

Background

Clinicians have very limited options to improve fracture repair. Therefore, it is critical to develop a new clinically available therapeutic option to assist fracture repair biologically. We previously reported that the topical cutaneous application of carbon dioxide (CO2) via a CO2 absorption-enhancing hydrogel accelerates fracture repair in rats by increasing blood flow and angiogenesis and promoting endochondral ossification. The aim of this study was to assess the safety and efficacy of CO2 therapy in patients with fractures.

Methods

Patients with fractures of the femur and tibia were prospectively enrolled into this study with ethical approval and informed consent. The CO2 absorption-enhancing hydrogel was applied to the fractured lower limbs of patients, and then 100% CO2 was administered daily into a sealed space for 20 min over 4 weeks postoperatively. Safety was assessed based on vital signs, blood parameters, adverse events, and arterial and expired gas analyses. As the efficacy outcome, blood flow at the level of the fracture site and at a site 5 cm from the fracture in the affected limb was measured using a laser Doppler blood flow meter.

Results

Nineteen patients were subjected to complete analysis. No adverse events were observed. Arterial and expired gas analyses revealed no adverse systemic effects including hypercapnia. The mean ratio of blood flow 20 min after CO2 therapy compared with the pre-treatment level increased by approximately 2-fold in a time-dependent manner.

Conclusions

The findings of the present study revealed that CO2 therapy is safe to apply to human patients and that it can enhance blood flow in the fractured limbs.

Trial registration

This study has been registered in the UMIN Clinical Trials Registry (Registration number: UMIN000013641, Date of registration: July 1, 2014).
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Metadata
Title
Topical cutaneous application of carbon dioxide via a hydrogel for improved fracture repair: results of phase I clinical safety trial
Authors
Takahiro Niikura
Takashi Iwakura
Takashi Omori
Sang Yang Lee
Yoshitada Sakai
Toshihiro Akisue
Keisuke Oe
Tomoaki Fukui
Takehiko Matsushita
Tomoyuki Matsumoto
Ryosuke Kuroda
Publication date
01-12-2019
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2019
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-019-2911-7

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