THE ROLE OF GRAFTS AND IMplants
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1 ORIGINAL ARTICLE Study of Rabbit Septal Cartilage Grafts Placed on the Nasal Dorsum Márcia Maria Ale de Souza, MD; Luiz Carlos Gregório, MD; Ricardo Sesso, MD; Soraia Ale Souza, MD; Flavio Settanni, MD Objective: To compare the reabsorption characteristics of fresh septal cartilage autografts, preserved homografts, and preserved autografts in the nasal dorsum of rabbits. Methods: Rabbit nasal dorsum cartilage grafts were placed in 3 groups. The first group used fresh autologous cartilage; the second group, alcohol-preserved homologous cartilage; and the third group, alcohol-preserved autologous cartilage. Each rabbit received 2 grafts, one crushed and another noncrushed. After 16 weeks, the grafts were removed for analysis. Results: No graft calcification occurred in any group. Chondrogenesis was observed in all groups. The fresh autograft group had the best results in the evaluation of the area of graft recovered and chondrocyte viability. The preserved autologous and homologous grafts did not differ in relation to any of the variables analyzed. grafts had inferior results in the area of graft recovered and chondrocyte viability compared with the noncrushed forms. No significant difference among the 3 groups was noted in the thickness of the fibrous capsule that developed around the graft. Conclusions: The fresh cartilage autograft was superior to the crushed and uncrushed preserved homografts and autografts; both types of preserved grafts had equivalent histological results. The uncrushed forms were superior to the crushed forms. Arch Facial Plast Surg. 2008;10(4): Author Affiliations: Division of Rhinology, Department of Otolaryngology Head and Neck Surgery (Drs Ale de Souza, Gregório, Souza, and Settanni), and Department of Medicine (Dr Sesso), Federal University of São Paulo, São Paulo, Brazil. THE ROLE OF GRAFTS AND IMplants in aesthetic and reconstructive surgery of the nose has evolved considerably during the past several decades. The search for the ideal material has led to an exponential growth in research and development of different alloplasts. However, their use in the nose has been associated with unacceptably high rates of extrusion, infection, and rejection. 1-3 Autogenous cartilage is considered to be ideal for all types of grafting in nasal surgery. The material survives as living tissue, is seldom reabsorbed, and does not stimulate an immune response, so problems with rejection, infection, and extrusion are rarely encountered with these grafts. 2,4 The use of cartilage grafts is one of the most important procedures in reconstructive nasal surgery; however, many questions remain unanswered, even regarding the use of autologous cartilage. According to Guyuron and Friedman, 5 preserved autologous cartilage remains clinically similar to fresh autologous cartilage. Some authors 6-9 consider the best option to be the use of homologous material when autologous cartilage is not available in the needed amount. The literature contains limited and contradictory information about the viability of crushed cartilage and the predictability of clinical outcomes with this material. 3 In addition, we have not found quantitative studies of preserved autografts and homografts in the literature that could support their use. The aim of this experimental study was to compare fresh autologous cartilage, considered the criterion standard material, with preserved homografts and autografts in crushed and uncrushed forms and placed in the nasal dorsa of rabbits. METHODS The adult rabbit is a well-established model for research about cartilage grafting because it has septal cartilage similar to human cartilage 10 and is an established recipient site model for nasal dorsal implants. We selected 120 days as our study end point to approximate the equivalent of more than 1 year in human life. We used 63 New Zealand white male rabbits (Oryctolagus cuniculus), aged approximately 1 year and weighing 2.75 to 3.50 kg. All procedures were performed under the animal care guidelines of the Committee on Animal Care institutional review board. Sixty animals were randomly allocated into 3 groups of 20 and identified with a number on the right ear. The first group was given fresh autologous cartilage (FAC); the second group, alcohol-preserved homologous cartilage (PHC); 250
2 and the third group, alcohol-preserved autologous cartilage (PAC). Three animals were used to standardize the best technique to dissect the graft and to define the size of the septal graft that could be obtained. We chose to remove one mm fragment and, subsequently, two 6 6-mm fragments as a standard graft measure. Crushing was performed using a cartilage crusher (Cottle model ; Karl Storz GmbH & Co, Tutlingen, Germany). The grade of crushing was defined as moderate (ie, moderate force was used to soften the surface without reducing the elastic strength of the cartilage). We standardized the technique for cartilage crushing with 2 taps, always performed by the same researcher (M.M.A.S.) to avoid variations in the procedure. We also standardized the placement of the uncrushed septal cartilage fragment on the left side of the nasal dorsum and the crushed fragment on the right side. Each rabbit s nose was depilated under general anesthesia, then sterilely prepared and draped. For the septum resection, the approach described by Gubisch et al 11 was used. This involved folding back the alar ridge of the nose to obtain exposure of the septum. After hemitransfixion incisions, bilateral mucoperichondrial flaps were elevated and a mm rectangle of cartilage (free of perichondrium) was removed. In the FAC group, the recipient site was prepared in the same surgical procedure as previously described by Maas et al 12 ; a 1.0-cm anterior incision through the skin and subcutaneous tissues was made on the dorsum of the nose. A subcutaneous pocket extending 4 cm in the direction of the cranium was formed directly over the bony dorsum, superficial to the periosteum. Before placement of the 2 cartilage grafts, each separated by 0.5 cm in the pocket, they were measured with a surgical compass to obtain two 6 6-mm fragments. One of them was crushed before placement. The grafts were well secured with 6.0 nylon sutures. The incisions were closed in 1 layer with a 4.0 nylon suture. In the PHC and PAC groups, 1 month before the placement of the septal graft on the nasal dorsum, the graft was removed (using the same septum approach as that used for the FAC group) and preserved in 70% alcohol. One month later, with the rabbit under general anesthesia, and using the same recipient site approach as that used for the FAC group, the graft was washed with isotonic sodium chloride solution and cut in 2 fragments as in the FAC group, and 1 fragment was crushed. In the PAC group, each animal received its own preserved septal cartilage. In the PHC group, the fragments were placed in the nasal dorsum of an animal different from the donor. During 16 weeks, no animal had signs of wound infection, wound dehiscence, flap necrosis, or graft extrusion. At the end of this period, the rabbits underwent anesthesia, the dorsum was reopened, and the grafts were removed along with the dense conjunctive tissue deposited around them. After removal, the length and width of the fragments were measured. HISTOLOGICAL STUDY Qualitative Studies Postimplantation specimens were prepared for serial section and staining by hematoxylin-eosin and toluidine blue. Histological sections were evaluated with the use of an optic microscope (Labophot; Nikon Corporation, Tokyo, Japan), and the degrees of calcification, ossification, and neochondrogenesis were analyzed. Quantitative Studies The hematoxylin-eosin stained sections were used to evaluate chondrocyte viability and the status of the chondroid tissue. The toluidine blue stained sections were used to evaluate Figure 1. A photomicrograph of noncrushed, fresh autologous cartilage shows a microscopic device with 25 points to count the number of viable chondrocytes. In the center we observed mature chondrocytes, with an area of chondrogenesis in the periphery (hematoxylin-eosin, original chondroid tissue matrix metachromasia and chondrocyte viability. Cartilage graft viability was based on the state of the chondroid matrix, specifically loss of matrix metachromasia and loss of chondrocyte nuclei from the lacunae. The absence of matrix metachromasia and chondrocyte nuclei was considered to indicate nonviable chondroid tissue. A morphometric analysis was performed to determine the percentage of viable chondrocytes in the grafts and the measurement of the thickness of conjunctive tissue. For each specimen, the percentage of viable chondrocytes was calculated using a device with 25 points per field, analyzing 12 microscopic fields (original magnification 400) for a total of 300 points for each cartilage segment 13 (Figure 1). The thickness of the conjunctive tissue around the graft was measured at 12 points in 3 histological sections (Figure 2). The average value of all measures was used as the result. STATISTICAL ANALYSIS We compared the continuous variables with normal distributions among the FAC, PHC, and PAC groups with 1-way analysis of variance. We used the Tukey test to assess the 2 2 differences between the groups. For continuous variables with nonparametric distribution, we performed the comparisons using the Kruskal-Wallis test. The comparison of continuous variables between crushed and uncrushed specimens within each study group was assessed with the Wilcoxon signed rank test. Statistical tests were 2 sided, and statistical significance was set at P
3 RESULTS Figure 2. A photomicrograph of noncrushed, preserved homologous cartilage shows a microscopic device to measure the thickness of the capsule of connective tissue at the surgically resected margins of the graft. On the left side are nonviable mature chondrocytes and sparse viable young chondrocytes in the periphery. On the right side there is a capsule of fibrous connective tissue (hematoxylin-eosin, original For the noncrushed grafts, the mean area of graft recovered was significantly larger in the FAC group than in the PHC (P.001) or the PAC group (P.001). The latter 2 groups had similar mean areas. The corresponding analysis for the crushed grafts revealed results similar to those for the noncrushed grafts. The FAC group showed a significantly larger mean area than the other 2 groups, and the PHC and PAC groups had similar results. Within the FAC group, the area of graft recovered was significantly larger when we used the noncrushed vs the crushed form (P.001). Superior results with the noncrushed forms were similarly observed in the PHC and PAC groups. Overall (including the crushed and noncrushed specimens), the best results were obtained with noncrushed grafts in the FAC group. Nevertheless, the mean area of graft recovered using crushed FAC was significantly smaller than that obtained with uncrushed PHC (P.001) or PAC (P.001) (Table). The mean percentage of area of recovered grafts in relation to the area of implanted uncrushed specimens for the FAC, PHC, and PAC groups was 86.3%, 68.5%, and 71.4%, respectively (P.001); the corresponding figures for the crushed forms were 44.9%, 31.9%, and 36.1% (P.001). For the analysis of viable chondrocytes, the results of the comparisons within and among the FAC, PHC, and PAC groups were exactly the same as those reported for the area of graft recovered (Table and Figures 3, 4, 5, and 6). The mean thickness of the capsule of dense conjunctive tissue was similar among the crushed forms in the FAC, PHC, and PAC groups; the corresponding comparisons among the 3 groups when we used the noncrushed forms were also equivalent. Within each group (FAC, PHC, and PAC), the thickness of the capsule was significantly greater (P.01) using crushed vs noncrushed grafts (Table). COMMENT Cartilage grafting has been used extensively to correct nasal framework deformities. The septum is often the preferred source of autogenous cartilage 2 ; however, it may be present in insufficient quantity for the reconstructions. Another donor site may be necessary, but this is limited by donor-site morbidity and increased operative time. In revisional surgeries, some authors 14 advocate the use of a preserved autologous cartilage bank; another alternative is the use of a preserved costal cartilage homograft, as suggested by Velidedeoğluetal. 9 One of the most important issues regarding cartilage grafts in the nose is the degree of reabsorption. In a study using radiographic analysis, Donald and Coy 15 found minimal reabsorption in irradiated cartilage homografts implanted in the sheep facial skeleton. In the literature, there are conflicting data about the results with preserved autografts and homografts. 7,14-16 In accordance with Keskin et al, 7 who performed an experimental study with homografts in tracheal stenosis, we also used 70% alcohol as the preservation solution. Adlington et al 17 reported that different modes of preparation of mouse costal cartilage homografts (irradiation, formalin, glutaraldehyde, and alcohol) did not influence observed fibrosis and reabsorption. The literature contains limited and contradictory information about the viability of crushed cartilage and the predictability of its clinical outcomes Most sur- Table. Histological Findings 16 Weeks After Grafting in the Study Groups Study Groups, Mean (SD) FAC PHC PAC Area of the graft recovered, mm 31.1 (4.2) a 16.2 (3.4) b,c 24.7 (4.7) 11.5 (3.9) b 25.7 (4.8) 13.0 (3.8) b Viable chondrocytes, % 44.4 (2.1) a 10.6 (0.9) b,c 22.9 (5.0) 7.1 (1.8) b 23.5 (4.0) 7.5 (1.5) b Thickness of the capsule of dense connective tissue, µm 25.1 (10.1) 36.4 (10.9) b 32.0 (9.7) 40.6 (12.0) d 31.9 (9.3) 40.5 (11.8) d Abbreviations: FAC, fresh autologous cartilage; PAC, alcohol-preserved autologous cartilage; PHC, alcohol-preserved homologous cartilage. a P.001 compared with the noncrushed PHC and PAC groups. b P.001 compared with the noncrushed form within the same group. c P.001 compared with the crushed PHC and PAC groups. d P =.007 compared with the noncrushed form within the same group. 252
4 Figure 3. A photomicrograph of crushed, fresh autologous cartilage shows nonviable chondrocytes in the center and an area of chondrogenesis in the periphery (hematoxylin-eosin, original Figure 5. A photomicrograph of crushed, preserved autologous cartilage shows rare viable chondrocytes at the periphery (hematoxylin-eosin, original Figure 4. A photomicrograph of noncrushed, preserved autologous cartilage shows nonviable chondrocytes in the center and an area of chondrogenesis in the periphery (hematoxylin-eosin, original Figure 6. A photomicrograph of crushed, preserved homologous cartilage shows rare viable chondrocytes at the periphery (hematoxylin-eosin, original geons are hesitant to use this material for contour restoration in rhinoplasty. In our study, noncrushed fresh autografts yielded the greatest mean area of recovered graft in relation to the implanted graft (86.3%), followed by the noncrushed PAC (71.4%) and noncrushed PHC (68.5%). Using the crushed forms, the area of recovered grafts was considerably reduced (FAC, 44.9%; PAC, 36.1%; and PHC, 31.9%). The recovered area of the crushed form of FAC was significantly smaller than those of the noncrushed forms of PAC and PHC. These findings support the suggestion of Brown et al, 1 who proposed that this decrease was caused by the destruction of the polysaccharide matrix, thus exposing antigens, with a resulting increased reabsorption. Other authors 4,19 have also found worse results with crushed cartilage, but have not proposed any explanation. In a study with rabbit ear cartilage, Rudderman et al 20 obtained a greater percentage of recovered graft volumes, including 94.5% for noncrushed FAC, 69.7% for crushed FAC, 91.3% for noncrushed PAC, and 74.2% for crushed PAC. Our results do not confirm those of Keskin et al, 7 who found that noncrushed FAC and PHC yielded similar recovered graft volumes when ear grafts were used for tracheal stenosis in rabbits. We found no calcification in any implant specimen. In another study with rabbit dorsal cartilage autografts, 2 minimal calcification was reported using grafts from the septum, auricle, and rib. Our results regarding the percentage of viable chondrocytes were similar to those of the area of recovered graft; the noncrushed forms were superior to the crushed forms, with the FAC group showing the best results. In a rabbit model of fresh crushed cartilage graft, Rudderman et al 20 documented a volume retention after 90 days of 70% and a chondrocyte viability rate of 70%; they concluded that crushed cartilage could be used to attain aesthetic goals, recommending overcorrection to achieve optimal final results. On the other hand, in our crushed FAC group, we obtained only 11% viable chondrocytes. In a study using mildly crushed human septal cartilage (similar to our degree of morselizing), Bujía 6 reported 30% chondrocyte viability. However, unlike our study, Bujía examined the viability of cartilageusingcellculturesonlyonce,1to2daysaftercrushing. In an experimental work in rabbits, Breadon et al 19 re- 253
5 ported that all uncrushed cartilage grafts remained viable. Guyuron and Friedman 5 revealed a surgical success rate of 87% with fresh crushed grafts. Yilmaz et al 21 found that crushed cartilage grafts in a rabbit model were viable after extensive crushing. In contrast, we observed that, irrespective of the group (FAC, PAC, or PHC), the chondrocyte viability decreased remarkably in the crushed forms. In fact, rabbitexperimentsbyverwoerd-verhoefetal 22 showedthat crushed cartilage grafts led to extensive necrosis and that only 10% to 30% of cells survived the process, depending on the crushing technique used. We believe that the cartilage crushing led to diminished viability and partial transformation to connective tissue, reducing graft volume, as alreadysuggestedbyhuizing. 18 Therefore,ourfindingssuggest that crushed cartilage may be only used for filling small nasal defects, with a slight overcorrection during placement of crushed cartilage grafts. There are some difficulties when our results are compared with those in the literature: most studies used groups with FAC and PHC, not PAC, and they assessed the grafts after a shorter time since implantation. 7,20,23 Although fresh autogenous septal cartilage is the first-line graft choice for rhinoplasty when this material is available, most of the animal studies summarized herein involved auricular cartilage ,24 In addition, the severity of crushing varies among the studies. This lack of standardization of crushing intensity may be a major reason for the conflicting results noted among the studies. In a recent study in rabbits, Cakmak et al 24 assessed the influence of crushing level and found that, as crushing intensity increased, more cartilage cells were irreversibly damaged, more cartilage tissue was transformed to connective tissue, and chondrocyte proliferation at the periphery decreased, leading to a reduction in graft volume. When we evaluated the thickness of the capsule of dense connective tissue, there was no significant difference among the FAC, PHC, and PAC groups. However, the crushed form had a thicker connective tissue capsule than the noncrushed form in all groups. Our findings do not support the clinical observations by Adlington et al 17 that the degree of graft reabsorption is counterbalanced by the extension of the fibrosis around it. Keskin et al 7 have also reported that the replacement of homologous cartilage by fibrous tissue compensated for the cartilage reabsorption and maintained the volume of homografts. In our study, the graft area was not maintained by the surrounding deposition of connective tissue, which did not compensate for the greater reabsorption in the PHC and PAC groups. This study is, to our knowledge, the only one in the literature to compare fresh autografts with preserved homografts and preserved autografts. Our findings support the recommendation by Lovas, 25 who advocates the preservation of remaining cartilage from nasal surgical procedures. However, in the present study, PAC had inferior results compared with fresh autografts. Some authors 6,7 consider a homologous graft the ideal material for grafting when fresh autologous cartilage is not available. Our inferior results with homografts compared with fresh autografts suggest that the risks and potential benefits with their use should be carefully weighed in the decision-making process. Accepted for Publication: April 30, Correspondence: Márcia Maria Ale de Souza, MD, rua Luis Molina 66, Apt 61A, São Paulo, SP, Brazil (marcia-ale@uol.com.br). Author Contributions: Study concept and design: Ale de Souza and Gregório. Acquisition of data: Ale de Souza, Souza, and Settanni. Analysis and interpretation of data: Ale de Souza, Sesso, and Souza. Drafting of the manuscript: Ale de Souza. Critical revision of the manuscript for important intellectual content: Ale de Souza, Gregório, Sesso, Souza, and Settanni. Statistical analysis: Ale de Souza and Sesso. Administrative, technical, and material support: Ale de Souza, Gregório, Souza, and Settanni. Study supervision: Ale de Souza. Financial Disclosure: None reported. REFERENCES 1. Brown BL, Kern EB, Neel HB. Transplantation of fresh allografts (homografts) of crushed and uncrushed cartilage and bone: a 1-year analysis in rabbits. Laryngoscope. 1980;90(9): Lattyak BV, Maas CS, Sykes JM. Dorsal onlay cartilage autografts. Arch Facial Plast Surg. 2003;5(3): Celik M, Tuncer S. Nasal reconstruction using both cranial bone and ear cartilage. Plast Reconstr Surg. 2000;105(5): Staffel G, Shockley W. Nasal implants. Otolaryngol Clin North Am. 1995;28(2): Guyuron B, Friedman A. The role of preserved autogenous cartilage graft in septorhinoplasty. Ann Plast Surg. 1994;32(3): Bujía J. Determination of the viability of crushed cartilage grafts: clinical implications for wound healing in nasal surgery. Ann Plast Surg. 1994;32(3): Keskin IG, Oz F, Oz B, Oktem F, Gustafson M. Tracheal reconstruction using alcoholstored homologous cartilage and autologous cartilage in the rabbit model. Int J Pediatr Otorhinolaryngol. 2000;56(3): Clark JM, Cook TA. Immediate reconstruction of extruded alloplastic implants with irradiated homograft costal cartilage. Laryngoscope. 2002;112(6): Velidedeoğlu H, Demir Z, Sahim U, Kurtay A, Erol OO. Block and surgicelwrapped diced solvent-preserved costal cartilage homograft application for nasal augmentation. Plast Reconstr Surg. 2005;115(7): Fry HJH. The aetiology of so-called septal deviations and their experimental production in the growing rabbit. Br J Plast Surg. 1968;21(4): Gubisch W, Greulich M, Donath K. Experimental and clinical study of the vitality of orthotopic cartilage transplants. Plast Reconstr Surg. 1995;95(4): Maas CS, Gnepp DR, Bumpous J. Expanded polytetrafluorethylene (Gore-Tex soft tissue patch) in facial augmentation. Arch Otolaryngol Head Neck Surg. 1993; 119(9): Cruz-Orive LM, Weibel ER. Recent stereological methods for cell biology: a brief survey. Am J Physiol. 1990;258(4, pt 1):L148-L Sancho BV, Molina AR. Use of septal cartilage homografts in rhinoplasty. Aesthetic Plast Surg. 2000;24(5): Donald PJ, Coy A. Cartilage implantation in head and neck surgery: report of a national survey. Otolaryngol Head Neck Surg. 1982;90(1): Brent B. The versatile cartilage autograft: current trends in clinical transplantation. Clin Plast Surg. 1979;6(2): Adlington P, Anscombe AJ, Phillips JJ. Influence of the mode of preparation on the long-term efficacy of homologous costal cartilage implants. J Laryngol Otol. 1992;106(6): Huizing EH. Experience on the use of homologous cartilage in nasal surgery. Acta Otorhinolaryngol Belg. 1970;24(1): Breadon GE, Kern EB, Neel HB III. Autografts of uncrushed and crushed bone and cartilage: experimental observations and clinical implications. Arch Otolaryngol. 1979;105(2): Rudderman RH, Guyuron B, Mendelsohn G. The fate of fresh and preserved, noncrushed and crushed autogenous cartilage in the rabbit model. Ann Plast Surg. 1994;32(3): Yilmaz S, Erçoçen AR, Can Z, Yenidunya S, Edali N, Yormuk E. Viability of diced, crushed cartilage grafts and the effects of Surgicel (oxidized regenerated cellulose) on cartilage grafts. Plast Reconstr Surg. 2001;108(4): Verwoerd-Verhoef HL, Meeuwis CA, Vanderheul RO, Verwoerd CDA. Histologic evaluation of crushed cartilage grafts in the growing nasal septum of young rabbits. ORL J Otorhinolaryngol Relat Spec. 1991;53(5): Wiseman JB, Holt GR, Keefe MA, Holck DE, Canaan RL, Clark WD. The fate of fresh, layered, nonsutured and sutured, autogenous cartilage in the rabbit model. Arch Facial Plast Surg. 2000;2(4): Cakmak O, Bircan S, Buyuklu F, Tuncer I, Dal T, Ozluoglu LN. Viability of crushed and diced cartilage grafts. Arch Facial Plast Surg. 2005;7(1): Lovas RM. Conclusions after 122 revision rhinoplasties: brief review of cases. Aesthetic Plast Surg. 1986;10(4):
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