Magnetic Intramedullary Lengthening Nails and MRI Compatibility

Gómez, C. Hohr; Nelson, Scott C.; Speirs, Joshua N; Barnes, Samuel

doi:10.1097/bpo.0000000000001236

Cited by 12 publications

(15 citation statements)

References 11 publications

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“…Despite this, it has not been tested for compatibility in the MRI environment and did not receive approval from the Federal Drug Agency (FDA); several studies have tested the safety from this aspect. Gomez et al did not find negative effects, such as heating, elongation, and migration forces, acting upon this implant in 1.5T and 3T fields [40]. Nevertheless, they concluded that 3T protocols should be avoided in patients who are still undergoing lengthening or if lengthening is planned in the future.…”

Section: Discussionmentioning

confidence: 88%

Comparison of Intramedullary Magnetic Nail, Monolateral External Distractor, and Spatial External Fixator in Femur Lengthening in Adolescents with Congenital Diseases

Pietrzak

Grzelecki

Parol

et al. 2021

JCM

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The aim of this study is to evaluate the course of the treatment and clinical and functional outcomes of femur lengthening in adolescents with congenital disorders by the application of different surgical methods. This retrospective study comprised 35 patients (39 procedures). A total of 11 patients underwent femur lengthening with the use of the intramedullary magnetic nail (IMN) Precise 2 (NuVasive, San Diego, CA, USA), 7 patients (11 procedures) with the use of the monolateral external distractor Modular Rail System (MRS) (Smith and Nephew, Memphis, TN, USA), and 17 with the use of the computer-assisted external fixator Taylor Spatial Frame (TSF) (Smith and Nephew, Memphis, TN, USA). The inclusion criteria were as follows: (1) congenital femoral length deficiency without any axial deformities and (2), independently of the finally applied treatment, the technical possibility of use of each of the analyzed methods. The distraction index did not differ significantly between the groups (p = 0.89). The median lengthening index was the lowest in the IMN group (24.3 d/cm; IQR 21.8–33.1) and statistically different in comparison to the MRS (44.2 d/cm; IQR 42–50.9; p < 0.001) and the TSF groups (48.4 d/cm; IQR 38.6–63.5; p < 0.001). Similarly, the consolidation index in the IMN group (12.9 d/cm; IQR 10.7–21.3) was statistically lower than that in the MRS (32.9 d/cm; IQR 30.2–37.6; p < 0.001) and the TSF (36.9 d/cm; IQR 26.6–51.5; p < 0.001) groups. This study indicates that IMN is a more valuable method of treatment for femoral length discrepancy without axial deformity than MRS and TSF in complication rate and indexes of lengthening and consolidation.

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Section: Discussionmentioning

confidence: 88%

Comparison of Intramedullary Magnetic Nail, Monolateral External Distractor, and Spatial External Fixator in Femur Lengthening in Adolescents with Congenital Diseases

Pietrzak

Grzelecki

Parol

et al. 2021

JCM

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“…Major concerns include implant heating and/or migration as well as unintentional elongation of the lengthening mechanism. 19 The MRI safety of magnetic spinal growing rods, which are similar implants as magnetic lengthening nails has been shown and recently granted FDA approval. 19,20 Gomez et al 19 studied the effects of MRI on Precice intramedullary lengthening nails.…”

Section: Discussionmentioning

confidence: 99%

Intramedullary Fixation of Double-Barrel Vascularised Fibula Grafts With Subsequent Lengthening for Reconstruction of the Distal Femur in Patients With Osteosarcoma

Lenze

O’Sullivan²,

McCombe

et al. 2022

Journal of Pediatric Orthopaedics

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Background: The use of vascularised fibula grafts is an accepted method for reconstructing the distal femur following resection of malignant childhood tumors. Limitations relate to the mismatch of the cross-sectional area of the transplanted fibula graft and the local bone, instability of the construct and union difficulties. We present midterm results of a unique staged technique-an immediate defect reconstruction using a double-barrel vascularised fibula graft set in in A-frame configuration and a subsequent intramedullary femoral lengthening. Methods: We retrospectively included 10 patients (mean age 10 y) with an osteosarcoma of the distal femur, who were treated according to the above-mentioned surgical technique. All patients were evaluated with regards to consolidation of the transplanted grafts, hypertrophy at the graft-host junctions, leg length discrepancies, lengthening indices, complications as well as functional outcome. Results: The mean defect size after tumor resection was 14.5 cm, the mean length of the harvested fibula graft 22 cm, resulting in a mean (acute) shortening of 4.7 cm (in 8 patients). Consolidation was achieved in all cases, 4 patients required supplementary bone grafting. Hypertrophy at the graft-host junctions was observed in 78% of the evaluable junctions. In total 11 intramedullary lengthening procedures in 9 patients had been performed at the last follow up. The mean Muskuloskeletal Society Rating Scale (MSTS) score of the evaluable 9 patients was 85% (57% to 100%) with good or excellent results in 7 patients. Conclusions: A-frame vascularised fibula reconstructions showed encouraging results with respect to defect reconstruction, length as well as function and should therefore be considered a valuable option for reconstruction of the distal femur after osteosarcoma resection. The surgical implementation is demanding though, which is emphasized by the considerable high number of complications requiring surgical intervention, even though most were not serious. Level of Evidence: Level IV-case series.

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“…If MRI is required for disease surveillance throughout the duration of lengthening, more studies are needed to determine the effect of magnetic resonance on the implant magnetic motor. 33 …”

Section: Discussionmentioning

confidence: 99%

Dual Magnetically Expandable Intramedullary Nails for Treatment of a Large Bony Defect in a Patient with Sarcoma: A Case Report

Copp¹,

Magister²,

Napora³

et al. 2022

Strategies in Trauma and Limb Reconstruction

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A bstract Aim To describe the surgical technique of performing an all-internal lengthening to address a large diaphyseal femur defect in the sarcoma patient. Background Various strategies exist to address large intercalary bone defects with various biomechanical and biological implications. Case description A 23-year-old female with high-grade osteosarcoma of her left femur underwent wide resection and an internal reconstruction of a 12.5-cm femoral defect using dual magnetic lengthening intramedullary nails resulting in restoration of leg lengths, and pre-resection function with minimal residual disability. Conclusion Preoperative chemotherapy, wide resection and post-operative chemotherapy for osteosarcoma are the current standard of care. Resection often leads to large bone defects requiring complex reconstruction. Following intercalary bone resection, biological reconstruction is a consideration. An all-inside technique was developed in an effort to minimise complications of long-term external fixation for distraction osteogenesis, or extensile secondary grafting procedures for induced membrane strategy. Clinical significance This previously unreported surgical technique allows for an all-internal lengthening of large diaphyseal bone defects. While specifically used in an oncologic post-resection setting, this technique is applicable to the broader limb reconstruction and lengthening practice and overcomes some inherent limitations to previously described techniques. How to cite this article Copp J, Magister S, Napora J, et al . Dual Magnetically Expandable Intramedullary Nails for Treatment of a Large Bony Defect in a Patient with Sarcoma: A Case Report. Strategies Trauma Limb Reconstr 2022;17(3):189–194.

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Magnetic Intramedullary Lengthening Nails and MRI Compatibility

Abstract: To assess patient safety and implant function after magnetic IMNs have been exposed to MRI.

Cited by 12 publications

References 11 publications

Comparison of Intramedullary Magnetic Nail, Monolateral External Distractor, and Spatial External Fixator in Femur Lengthening in Adolescents with Congenital Diseases

Comparison of Intramedullary Magnetic Nail, Monolateral External Distractor, and Spatial External Fixator in Femur Lengthening in Adolescents with Congenital Diseases

Intramedullary Fixation of Double-Barrel Vascularised Fibula Grafts With Subsequent Lengthening for Reconstruction of the Distal Femur in Patients With Osteosarcoma

Dual Magnetically Expandable Intramedullary Nails for Treatment of a Large Bony Defect in a Patient with Sarcoma: A Case Report

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