Percutaneous radiofrequency ablation: relationship between different probe types and procedure time on length and extent of osteonecrosis in dog long bones

Martel, José; Bueno, Ángel; Domínguez, M. P.; Llorens, Pilar; Quirós, Juan Carlos López Bernaldo de; Delgado, Carlos Arca

doi:10.1007/s00256-007-0416-1

Cited by 29 publications

(17 citation statements)

References 18 publications

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“…Furthermore, there are no experimental studies on the effect of the reactive zone characteristics on the thermal lesion. In spite of this, the computed lesion diameters in this study (1.8-2.4 cm) were in agreement with the value of 1.85 cm reported in [9] for an electrode and ablation protocol similar to our model.…”

Section: Discussionsupporting

confidence: 71%

“…The reactive zone of a cortical OO is partially surrounded by the cortex (cortical bone) while the rest is enclosed by trabecular bone (Figure 1). It has been suggested that the presence of cortical bone during RFA could play the role of a thermal insulator and hence grant protection to the adjacent soft tissues [7][8][9]. We have already observed this performance in a previous modeling study [10], which could be explained by the lower electrical conductivity of the cortical bone than the surrounding tissues.…”

Section: Introductionmentioning

confidence: 55%

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Computer modelling of RF ablation in cortical osteoid osteoma: Assessment of the insulating effect of the reactive zone

Irastorza

Trujillo

Martel

et al. 2016

International Journal of Hyperthermia

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2 AbstractPurpose: To study by computer simulations the insulating role of the reactive zone surrounding a cortical osteoid osteoma (OO) in terms of electrical and thermal performance during radiofrequency ablation (RFA). Material and methods:We modeled a cortical OO consisting of a nidus (10 mm diameter) enclosed by a reactive zone. The OO is near a layer of cortical bone 1.5 mm thick. Trabecular bone partially surrounds the OO and there is muscle around the cortical bone layer. We modeled RF ablations with a non-cooled-tip 17G needle electrode (300 s duration and 90ºC target temperature). Sensitivity analyses were conducted assuming a reactive zone electrical conductivity value (σ rz ) within the limits of the cortical and trabecular bone, i.e. 0.02 S/m and 0.087 S/m, respectively. In this way we were really modeling the different degrees of osteosclerosis associated with the reactive zone. Results:The presence of the reactive zone drastically reduces the maximum temperature reached outside it. The temperature drop is proportional to the thickness of the reactive zone: from 68ºC when it is absent to 44ºC when it is 7.5 mm thick. Higher nidus conductivity values (σ n ) implied higher temperatures, while lower temperatures meant higher σ rz values. Changing σ rz from 0.02 S/m to 0.087 S/m reduced lesion diameters from 2.4 cm to 1.8 cm. Conclusions:The computer results suggest that the reactive zone plays the role of insulator in terms of reducing the temperature in the surrounding area.

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 55%

Computer modelling of RF ablation in cortical osteoid osteoma: Assessment of the insulating effect of the reactive zone

Irastorza

Trujillo

Martel

et al. 2016

International Journal of Hyperthermia

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“…Many reports revealed that ON could be induced by radiofrequency [35][36][37][38][39]. Martel et al [35] described that percutaneous radiofrequency ablation in dog long bone and found ON and reparative reaction in trabecular bone with cortical bone and articular cartilage intact.…”

Section: Physical Insult-induced Onfhmentioning

confidence: 97%

Experimental animal models of osteonecrosis

et al. 2011

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Osteonecrosis (ON) or avascular necrosis (AVN) is a common bone metabolic disorder, mostly affecting femoral head. Although many biological, biophysical, and surgical methods have been tested to preserve the femoral head with ON, none has been proven fully satisfactory. It lacks consensus on an optimal approach for treatment. This is due, at least in part, to the lack of ability to systematically compare treatment efficacy using an ideal animal model that mimics full-range osteonecrosis of femoral head (ONFH) in humans with high incidence of joint collapse accompanied by reparative reaction adjacent to the necrotic bone in a reproducible and accessible way. A number of preclinical animal ON models have been established for testing potential efficacy of various modalities developed for prevention and treatment of ON before introduction into clinics for potential applications. This paper describes a number of different methods for creating animal experimental ON models. Advantages and disadvantages of such models are also discussed as reference for future research in battle against this important medical condition.

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“…General information about the RFA technique is provided in previous studies (7)(8)(9)(20)(21)(22)(23)(24). The specific technical considerations used in our study are as follows: The procedure was performed under general (70 patients) or spinal (two patients) anesthesia.…”

Section: Rfa Techniquementioning

confidence: 99%

CT-guided radiofrequency ablation of osteoid osteoma: correlation of clinical outcome and imaging features

Rehnitz¹,

Sprengel²,

Lehner³

et al. 2013

Diagn Interv Radiol

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ORIGINAL ARTICLE PURPOSE We aimed to retrospectively evaluate the computed tomography (CT) and magnetic resonance imaging (MRI) findings of patients with osteoid osteoma treated with CT-guided radiofrequency ablation (RFA) along with the clinical outcome and long-term success. MATERIALS AND METHODSSeventy-three CT-guided RFA procedures were performed in 72 patients. The long-term success was assessed using a questionnaire including several visual analog scale scores. The CT evaluation included pre-and immediate postprocedural imaging of all 72 patients, and MRI was performed in 18 patients with follow-up imaging (mean, 3.4±2.2 months). The evaluation criteria included nidus morphology and a correlation with markers of clinical success. RESULTSThe primary technique effectiveness rate was 71/72 (99%). One relapse was successfully retreated, leading to a secondary technique effectiveness rate of 72/72 (100%). The longterm follow-up (mean, 51.2±31.2 months; range, 3-109 months) revealed a highly significant reduction of all assessed limitation scores (P < 0.001). The CT morphology was typical in all cases and did not change during the short-term follow-up. The follow-up MRI patterns varied considerably, including persistent nidus contrast enhancement in one-third (6/18) and persistent marrow edema in half (9/18) of the patients. None of the investigated MRI and CT patterns correlated with the clinical outcome. CONCLUSIONThe long-term outcome of CT-guided RFA of osteoid osteoma is excellent. There is no correlation of the CT and MRI patterns with the clinical outcome. Thus, the treatment decisions should not be solely based on the imaging findings. Investigators should also be aware of the variety of imaging patterns after RFA.

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Percutaneous radiofrequency ablation: relationship between different probe types and procedure time on length and extent of osteonecrosis in dog long bones

Abstract: Our study confirms the insulative effect of cortical bone. RFA can be safely performed close to the joint surface without damaging the cartilage.

Cited by 29 publications

References 18 publications

Computer modelling of RF ablation in cortical osteoid osteoma: Assessment of the insulating effect of the reactive zone

Computer modelling of RF ablation in cortical osteoid osteoma: Assessment of the insulating effect of the reactive zone

Experimental animal models of osteonecrosis

CT-guided radiofrequency ablation of osteoid osteoma: correlation of clinical outcome and imaging features

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