• Felix M Bläsius, Björn-Christian Link, Frank J P Beeres, Lukas D Iselin, Benjamin Moritz Leu, Boyko Gueorguiev, Kajetan Klos, Bergita Ganse, Sven Nebelung, Ali Modabber, Daphne Eschbach, Christian David Weber, Klemens Horst, and Matthias Knobe.
• Department of Trauma and Reconstructive Surgery, University Hospital RWTH Aachen, Pauwelsstraße 30, D-52074 Aachen, Germany. Electronic address: fblaesius@ukaachen.de.
• Injury. 2019 Dec 1; 50 (12): 2332-2338.

PurposeWound healing complications are a major concern after open reduction and internal fixation (ORIF) in patients with calcaneal fractures. Microcirculation is known to play a key role in bone and soft tissue healing. The present study aimed to characterize and contrast the dynamics of changes in microcirculation comparing two different surgical procedures: A) ORIF and B) a minimally invasive approach (MIA).MethodsBlood flow (BF[AU]), oxygen saturation (sO2[%]) and relative amount of haemoglobin (rHb[AU]) were measured at two depths (2 mm and 8 mm) non-invasively by spectrophotometry (Micro-Lightguide O2C®, LEA Medizintechnik, Giessen, Germany) before surgery and every 24 h after surgery for a duration of six days. A linear mixed model (LMM) was used to analyse longitudinal data and repeated measurements.ResultsNineteen patients (44 years, range 21.9-71.0 years) were enrolled in the study. Surgical treatment consisted of ORIF (n = =15) and MIA (n = =9). The postoperative BF and sO2 at the 2 mm and 8 mm depths were higher in the ORIF group (BF: p < 0.001, p = =0.003; sO2: p = =0.001, p = =0.011). The BF at the 2 mm and 8 mm depths increased after surgery (2 mm: p = =0.003, 8 mm: p = =0.001) in both groups. This increase did not correlate with the surgical technique. sO2 and rHb values at the 8 mm depth decreased after surgery (sO2: p = =0.008, rHb: p < 0.001) in both groups, whereas sO2 at the 2 mm depth increased after surgery (p = =0.003). Furthermore, the surgical technique correlated with the postsurgical course of sO2 values at the 2 mm depth (p = =0.042).ConclusionsThe spectrophotometry results were in line with the generally accepted phases of soft tissue wound healing. Postsurgical changes in microcirculation are predominantly independent of surgical techniques and may be primarily determined by wound and fracture healing. Future studies should focus on the potential of spectrophotometry to monitor wound healing after surgery. Moreover, studies with longer observation periods are needed in order to examine the changes in microcirculation during all wound-healing phases.Copyright © 2019. Published by Elsevier Ltd.

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