Traitement des pertes de substance osseuse des membres par transport osseux segmentaire

Outcome analysis of ilizarov and monorail fixators in the treatment of nonunion of long bones: A systematic review and proportion meta-analysis

Introduction

Nonunion of long bones is a major complication following fractures that requires a substantial amount of investment both monetary and time from patients and surgeons. The need to comprehensively understand the complications, outcomes and distraction capability is profound, which necessitates a review of current evidence on special fixators used for distraction. The current systematic review aims to study the available literature on distraction osteogenesis using special fixators (Ilizarov and Limb Reconstruction System) in the management of nonunion (infected and non-infected).

Methods

Cochrane Library, PubMed, Scopus were searched until January 2022. The review included all original studies which used Ilizarov or Monorail Fixators/LRS in the treatment of nonunion of long bones. The quality of studies was assessed using the Modified Coleman Methodology Score.

Results

A total of 35 original studies with Ilizarov (n = 29) and LRS (n = 8) were selected including two comparative studies. The pooled data meta-analysis and the subgroup analysis of these studies found both Ilizarov and LRS fixator yield similar functional outcomes for the treatment of long bones nonunion.

Conclusion

The review was conducted to understand the scenario of nonunion in long bones. Pin tract infection is found to be the most common complication followed by adjacent joint stiffness and deformity. In our review we observed that both external fixator time and index were lower in LRS compared to Ilizarov group. Further RCT are required comparing Ilizarov and LRS fixators to effectively comment upon the superiority of the implants.

Topical cutaneous application of CO2 accelerates bone healing in a rat femoral defect model

BACKGROUND

Bone defects may occur because of severe trauma, nonunion, infection, or tumor resection. However, treatments for bone defects are often difficult and have not been fully established yet. We previously designed an efficient system of topical cutaneous application of carbon dioxide (CO₂) using a novel hydrogel, which facilitates CO₂ absorption through the skin into the deep area within a limb. In this study, the effect of topical cutaneous application of CO₂ on bone healing was investigated using a rat femoral defect model.

METHODS

In this basic research study, an in vivo bone defect model, fixed with an external fixator, was created using a rat femur. The affected limb was shaved, and CO₂ was applied for 20 min/day, 5 days/week. In the control animals, CO₂ gas was replaced with air. Radiographic, histological, biomechanical, and genetic assessments were performed to evaluate bone healing.

RESULTS

Radiographically, bone healing rate was significantly higher in the CO₂ group than in the control group at 4 weeks (18.2% vs. 72.7%). The degree of bone healing scored using the histopathological Allen grading system was significantly higher in the CO₂ group than in the control group at 2 weeks (1.389 ± 0.334 vs. 1.944 ± 0.375). The ultimate stress, extrinsic stiffness, and failure energy were significantly greater in the CO₂ group than in the control group at 4 weeks (3.2 ± 0.8% vs. 38.1 ± 4.8%, 0.6 ± 0.3% vs. 41.5 ± 12.2%, 2.6 ± 0.8% vs. 24.7 ± 5.9%, respectively.). The volumetric bone mineral density of the callus in micro-computed tomography analysis was significantly higher in the CO₂ group than in the control group at 4 weeks (180.9 ± 43.0 mg/cm³ vs. 247.9 ± 49.9 mg/cm³). Gene expression of vascular endothelial growth factor in the CO₂ group was significantly greater than that in the control group at 3 weeks (0.617 ± 0.240 vs. 2.213 ± 0.387).

CONCLUSIONS

Topical cutaneous application of CO₂ accelerated bone healing in a rat femoral defect model. CO₂ application can be a novel and useful therapy for accelerating bone healing in bone defects; further research on its efficacy in humans is warranted.

Reconstruction of a Traumatic Bone Defect from Distal Femur

INTRODUCTION

Bone defect is a difficult problem in orthopedics. The treatment conventionally relies on techniques such as induced membrane, grafts, and elongations. The reintegration of an externalized osseous fragment involves significant infectious risks but is essential in certain situations.

CASE REPORT

We report the case of a 10 cm traumatic bone loss of the right distal femur in a 35-year-old woman. Treatment consisted of paring, reintegration and stabilization by the external fixative. The 5-year follow-up was satisfactory with good consolidation and good function of the limb.

CONCLUSION

The reintegration of a bone fragment of limb expelled onto the soil is rare. We tried it because the response time was very short, but also and especially because the fragment was expelled on very hot bitumen. These two elements limited the risk of infection and favored the osseointegration of the fragment. We have not found a similar case reported in the literature allowing comparisons and recommendations.

Current Practice in the Management of Open Fractures Among Orthopaedic Trauma Surgeons. Part B: Management of Segmental Long Bone Defects. A Survey of Orthopaedic Trauma Association Members

OBJECTIVES

Treatment of segmental long bone defects is one of the areas of substantial controversy in current orthopaedic trauma. The main purpose of this survey was to determine current practice and practice variation within the Orthopaedic Trauma Association (OTA) membership on this topic.

DESIGN

Survey.

SETTING

Web-based survey.

PARTICIPANTS

Three hundred seventy-nine orthopaedic trauma surgeons.

METHODS

A 15-item questionnaire-based study titled "OTA Open Fracture Survey" was constructed. The survey was delivered to all OTA membership categories. Different components of the data charts were used to analyze various aspects of open fracture management, focusing on definitive treatment and materials used for grafting in "critical-sized" segmental bone defects.

RESULTS

Between July and August 2012, a total of 379/1545 members responded for a 25% response rate. Overall, 89.5% (339/379) of respondents use some sort of antibiotic cement spacer before bone grafting. It was found that 92% of respondents preferred to use some type of autograft at time of definitive grafting of segmental defects. When using a grafting technique, 88% said they used some type of antibiotic cement. Within that context, 60.1% said graft placement should be done at 6 weeks.

CONCLUSIONS

There continues to be substantial variation in the timing of bone graft placement after soft tissue healing and the source and form of graft used. The use of antibiotic cement is common in segmental defects that require delayed bone grafting. Obtaining base-line practice characteristics on controversial topics will help provide a foundation for assessing research needs and, therefore, goals.

LEVEL OF EVIDENCE

Therapeutic Level V. See Instructions for Authors for a complete description of levels of evidence.

Limb lengthening using ankle joint distraction (arthrodiastasis) followed by arthrodesis. Experience with one case

Tibial aplasias are difficult entities to manage and sometimes require significant limb lengthening. Preserving the joint is the preferred option in these cases. However, when function is not ensured, lengthening beginning in the joint can be attempted followed by arthrodesis. This report presents the clinical and radiological results of a patient treated with intra-articular lengthening (or arthrodiastasis) associated with talocrural arthrodesis. Although this original technique provided satisfactory results, this surgical program remains complicated.

Tibial segmental bone defect reconstruction by Ilizarov type bone transport in an induced membrane

The management of combined loss of skin coverage and bone substance in the lower third of the leg is problematic. A recommended sequential strategy associates removal of infected tissue and coverage followed by treatment of the bone defect. We report a technique without microsurgery, using Masquelet's induced membrane technique to manage the bone loss, associated to bone transport and coverage by a fasciocutaneous flap with distal pedicle. In a patient presenting with a 10 cm defect with bone exposure, this 2-step procedure allowed consolidation at 7 months without functional sequelae; the fixator was kept in place for 9 months. Neither microsurgery nor cancellous bone graft was required. Using a spacer to induce a membrane facilitated bone transport and distal consolidation.