Name: stromal vascular fraction-enriched fat grafting for the treatment of symptomatic end-neuromata
Uploaded: 2017-11-23T13:00:00
Description: Watch this Scientific Journal Video about Stromal Vascular Fraction-enriched Fat Grafting for the Treatment of Symptomatic End-neuromata at JoVE.com

The authors have no acknowledgements.

The protocol follows the guidelines of the University Hospital Zurich Human Research Ethics Committee.
1. Diagnoses of Neuromata and Patient Selection
<ol>
	<li>Perform preoperative nerve blocks proximal to the neuroma in order to confirm the diagnoses. Assess the blocks in the middle third of the forearm and exclude potential triggers of the overlapping innervation areas of the SBRN, such as the lateral antebrachial cutaneous nerve (LACN), posterior interosseous nerve (PIN), and a dorsal br...

<ol>
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A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multilineage+cells+from+human+adipose+tissue:+implications+for+cell-based+therapies.">Multilineage cells from human adipose tissue: implications for cell-based therapies.</a> Tissue Eng. 7 (2), 211-228 (2001).</li><li>Fraser, J. 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A., Mian, S., Kendzerska, T., French, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Measures+of+adult+pain:+Visual+Analog+Scale+for+Pain+(VAS+Pain),+Numeric+Rating+Scale+for+Pain+(NRS+Pain),+McGill+Pain+Questionnaire+(MPQ),+Short-Form+McGill+Pain+Questionnaire+(SF-MPQ),+Chronic+Pain+Grade+Scale+(CPGS),+Short+Form-36+Bodily+Pain+Scale+(SF-36+BPS),+and+Measure+of+Intermittent+and+Constant+Osteoarthritis+Pain+(ICOAP).">Measures of adult pain: Visual Analog Scale for Pain (VAS Pain), Numeric Rating Scale for Pain (NRS Pain), McGill Pain Questionnaire (MPQ), Short-Form McGill Pain Questionnaire (SF-MPQ), Chronic Pain Grade Scale (CPGS), Short Form-36 Bodily Pain Scale (SF-36 BPS), and Measure of Intermittent and Constant Osteoarthritis Pain (ICOAP).</a> Arthritis Care Res (Hoboken). 63 Suppl. 63, S240-S252 (2011).</li><li>Stokvis, A., van der Avoort, D. J., van Neck, J. W., Hovius, S. 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The purpose of the present study is to methodically illustrate the technical aspects of SVF-enriched fat grafting as a novel treatment for symptomatic end-neuromata.
Neuromata of the SBRN are associated with a surgical success rate of only 33%12. Vaienti et al. presented a series of favorable results in early follow-up using perineural fat grafting (PFG) without adding the SVF in 8 patients with painful neuromata of the upper limb<sup c...

The management of symptomatic end-neuromata of the SBRN remains challenging with a multitude of existing surgical treatments. Principally, the neuroma is excised and the remaining nerve stump is relocated into neighboring structures such as muscles1,2, bone3, or veins4. This is assumed to prevent the out-sprouting of the regenerating neural fascicles by mimicking the ambience of an end-organ. However, none of these techniques proved superior, as high rates of pain relapse and insufficient pain reduction were often observed.
Recently, fat grafting around the remaining nerve stump yielded promising results and was advocated as a new treatment option for painful end-neuromata of the upper limb5. Besides acting as a mechanical barrier to prevent continuing motion and tap pain, the beneficial aspect of fat grafting is rather attributed to the cellular level. Human adipose tissue contains multiple cell types, including preadipocytes, mast cells, pericytes, endothelial cells, vascular smooth muscle cells, fibroblasts, and adipose derived stem cells (ADSCs) along with hematopoietic stem cells6. This heterogeneous cell population is referred to as Adipose-Derived Regeneration Cells (ADRCs) or SVF, and can be obtained from the lipoaspirate by an isolation system (see the Table Of Materials) and applied enzyme reagent (see Table of Materials)7. The exact mechanism of action is still not fully understood; however, SVF has been associated with improvements in angiogenesis, immunomodulation, differentiation, and secretion of extracellular matrix8.
The concentrated cell population of the SVF is added to the fat graft with the purpose to reduce the resorption rate and to increase the regenerative potential of the fat graft, as recent studies revealed pain relapse after 12 months with fat grafting without added SVF5. Moreover, the biological action also provides beneficial effects on the nerve itself by reducing disorganized axonal sprouting of the stump9 and subsequent scar adherences which might result in nerve entrapment.
The first clinical study to describe SVF-enriched fat grafting as a novel surgical option for the treatment of symptomatic end-neuromata of SBRN has been recently published10. In general, the technique can be applied to any neuroma occurring after accidental or iatrogenic nerve injury. The aim of the present subsequent study is to methodically illustrate the technical aspects of this procedure.

<table border="0" cellpadding="0" cellspacing="0" width="688">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">Cytori Celution System</td>
			<td style="width:71px;">Cytori</td>
			<td style="width:119px;"></td>
			<td style="width:167px;">isolation system</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Celase</td>
			<td style="width:71px;">Cytori</td>
			<td style="width:119px;"></td>
			<td>enyzme reagent</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">liposuction system</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:331px;">tumescent solution (500 ml Lactated Ringers, 20 ml of 1% lidocaine and 1 mg epinephrine)</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">14-gauge infiltrator</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3 mm-collecting cannula (15, 26, 32 cm)</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">60 mL Tommey syringes</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">mosquito clamp</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Toomey syringe stand</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:331px;">4 cannulas (fat injecting cannulas 1.5 mm, syringe NO.2, 90 mm)</td>
			<td style="width:71px;">Chalybs</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">10 mL syringes</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">connecting device for syringes</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">#11- and #15-blade scalpel</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">stevens scissors</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">pins pincette</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">bipolar electrocautery</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:331px;">suture material</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">adhesive dressing</td>
			<td style="width:71px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">binocular loupes magnifier glasses (2.5-3.5x)</td>
			<td style="width:71px;">Carl Zeiss</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:331px;">Statistical Package for Social Sciences, version 22</td>
			<td>IBM</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
	</tbody>
</table>

stromal vascular fraction-enriched fat grafting for the treatment of symptomatic end-neuromata

The purpose of this study was to methodically illustrate and highlight the crucial steps of stromal vascular fraction (SVF)-enriched fat grafting as a novel treatment of symptomatic end-neuromata of peripheral sensory nerves, and in this study, specifically of the superficial branch of the radial nerve (SBRN). Despite a multitude of existing treatments, persistent postoperative pain and common pain relapse are still very common, independent of the procedure assessed. The neuroma is microsurgically excised accordingly to standardized protocol. Instead of the relocation of the regenerating nerve stump in neighboring anatomical structures, such as muscle or bone, a fat graft is applied perifocally and acts as a mechanical barrier. In order to reduce the fat resorption rate and boost the regenerative potential of the graft, the highly concentrated SVF is integrated in the grafting. The SVF is isolated from subcutaneous fat by enzymatic and mechanic separation of the lipoaspirate by a specific commercial isolation system. The SVF-enriched fat graft provides both a mechanical barrier and various biological effects at the cellular level, including improving angiogenesis, inflammation, and fibrosis. Both mechanical and biologic effects help to reduce the disorganized axonal outgrowth of the nerve stump during nerve regeneration and hence prevent the recurrence of painful end-neuromata.

Data were analyzed using statistical software and presented as means &#177; standard deviations. The Kolmogorov-Smirnov test was applied to verify the nonparametric distribution of the study population and confirmed a negative empirical distribution. Based on the nonparametric nature of the study population, the Wilcoxon&#39;s test for related samples was employed to compare preoperative and postoperative outcomes. Statistical significance was regarded at p-values less than 0.05<s...

Watch this Scientific Journal Video about Stromal Vascular Fraction-enriched Fat Grafting for the Treatment of Symptomatic End-neuromata at JoVE.com

Stromal Vascular Fraction-enriched Fat Grafting for the Treatment of Symptomatic End-neuromata

The purpose of the study is to illustrate the technical procedure of stromal vascular fraction (SVF)-enriched fat grafting as a novel treatment of symptomatic end-neuromata. This technique provides advantages of both the mechanical barrier and the biological action at the cellular level by the processed and concentrated SVF.

The purpose of this study was to methodically illustrate and highlight the crucial steps of stromal vascular fraction (SVF)-enriched fat grafting as a ...

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