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58 / Posttraumatic Nasal Deformity and Nasal Fracture Management
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AB
Figure 5-1. Severe saddle nose
deformity sustained from direct blow to nose by baseball bat. (A) Pre op post traumatic saddle nose in 10 year old. (B) Post operative repair of acute nasal fracture with rib cartilage grafting.
to septal hematoma following blunt trauma. Unfor­tunately, childhood nasal trauma is often underap­preciated and nasal fracture and/or septal injury is overlooked, resulting in external and internal nasal deformities in adulthood.
Mechanism of Injury
Murray’s seminal work detailing the pathophysiol­ogy of nasal bone fractures in fresh cadaver speci­mens provided valuable insight into the mechanism of injury in nasal trauma.6 Nasal fractures are most commonly due to a lateral force, which results in two fracture lines running parallel on the ipsilateral thin nasal bone along the dorsum and meeting at the junction of the thick and thin bones. In this type
Nasal bone
High velocity
fracture
Septal
cartilage
Anterior
nasal spine
Low velocity
fracture
Maxillary crest
of injury, the nose may appear deviated due to the depression of the unilateral bony fragment.
Frontal force must be of greater magnitude to
produce a nasal fracture because the nasal bones are buttressed by the frontal process of the maxilla, the nasal spine, and the perpendicular plate of the eth­moid. The resultant injury includes not only a nasal bone fracture (which may be comminuted), but also a C-shaped fracture in the septum extending from just beneath the dorsum of the nose, inferiorly and posteriorly through the perpendicular plate of the ethomid, and curving anteriorly to the inferior car­tilaginous septum near the maxillary crest and the angle of the vomer. Frequently, the inferior end of the septum becomes dislodged from its groove and is deflected obliquely into the nasal cavity (Figure 5-2).
Figure 5-2. The nasal septum and patterns
of septal fractures. The septal (quadrangular) cartilage articulates with the anterior nasal spine caudally, the perpendicular plate of the ethmoid posteriorly, and the vomer inferiorly; the vomer articulates with the maxillary and palatine crests. The septal cartilage
Vomer
typically rests along a groove at the midline; this is known as the vomerine groove. The most common septal fracture is along this junction between the vomerine groove and quadrangular cartilage. A high-velocity injury or frontal impact results in a more extensive septal fracture through the thin central region of the septal cartilage and extending to the bony cartilaginous junction.
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As a result, the ala and nostril on the deflected side are widened, while the opposite side is flattened and narrowed.
High-impact frontal force injury to the nose, such as that sustained during a motor vehicle acci­dent, may produce comminuted or compound nasal fractures. If a patient sustains this type of injury, one must rule out a nasal orbital ethmoid (NOE) complex fracture after the cervical spine, skull, and ophthalmic injuries are cleared (Figure 5-3). Signs of NOE complex fractures include telecanthus, epi­phora, periorbital emphysema, clear rhinorrhea secondary to cerebrospinal fluid leak, and a flat­tened nasofrontal root. Surgeons should have a low threshold for requesting a non-contrast CT of the facial skeleton if the slightest clinical suspicion for
an orbital or facial fracture arises. Further work-up and management of NOE injuries is beyond the scope of this chapter.
Diagnosis
Identification of a nasal fracture is primarily a clini­cal diagnosis and plain radiographs are rarely, if ever, necessary. Patients may experience epistaxis, edema, ecchymosis, and nasal obstruction. Upon palpation, tenderness, crepitus, and step-off deformities may be found. An obvious deformity may be appreci­ated, such as a conspicuous concavity or convex­ity of the nasal bones resulting in a twisted nose appearance. In the acute setting, evidence of nasal deformity may be hidden by edema.
A1
B1
Figure 5-3. Severe naso-ethemoid impaction fracture sustained in motor vehicle accident before (A) and
after (B) reduction of nasal bone and septal fracture.
A2 A3
B2 B3
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A
B
Figure 5-4. (A) pre operatively
acute fracture with deviation from a blow to the nasal pyramid. (B) Post operatively corrected by open reduction fixation with the sue of spreader grafts to correct alvulsion and concavity.
Avulsion of the upper lateral cartilage attach-
ments may also result in a concave appearance of the middle third of the nose (Figure 5-4). The cephalic portion of the upper lateral cartilage is attached to the caudal border of the nasal bone. The medial portion of the upper lateral cartilage is attached to the dorsal cartilaginous septum; this attachment constitutes the internal nasal valve and has been described as a 10–15 degree angle on intranasal examination.7 Placement of a cotton-tipped appli­cator in the region of the internal nasal valve with subsequent improvement in nasal airway function confirms the diagnosis of internal nasal valve col­lapse. Closed reduction of the fractured nasal bone may re-approximate the avulsed upper lateral carti­lage to the caudal border of the nasal bone. However,
avulsion of the upper lateral cartilage from the dor­sal cartilaginous septum may require placement of a spreader graft to address the concavity of the middle third of the nose as well as improve nasal function by reconstituting the internal nasal valve.8 (Figure 5-5)
Intranasal examination should be performed after decongesting the nasal cavities. Topical oxy­metazoline is effective and, when mixed with 4% topical lidocaine, can achieve both decongestion and anesthesia. Intranasal examination is performed to evaluate the status of the septum and to identify mucosal injuries. If a bulge is appreciated along the septum, it may signify a septal hematoma. If a sep­tal hematoma is suspected, a helpful maneuver is to palpate the intranasal bulge with a cotton-tipped applicator and, if it is compressible, fine-needle
Figure 5-5. (A) Preoperative nasal
fracture from an accidental blow with a car tire jack from right to left across the the nasal dorsum. (B) post
BA
operative from a closed reduction nasal fracture repair.
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aspiration is diagnostic. In the pediatric patient, the nose tends to buckle and twist rather than fracture. Therefore, there is a higher incidence of separation of the perichondrium from the septal cartilage and subsequent potential for hematoma formation. Dig­ital photography of the subsequent nasal deformity is obtained for the medical record.
Treatment
Timing of Repair
Some controversy surrounds timing of repair for the acute nasal fracture. Edema follows shortly after the initial injury, making it difficult to allow for pre­cise reduction. Therefore, it is best to institute con­servative measures to minimize edema and to allow for proper analysis of potential deformity three to five days after injury. ures include: soft diet, elevation of the head of the patient’s bed, and the application of an ice compress to the area of injury. Definitive treatment can be carried out five to twelve days after the initial injury. During this period, the fractured components of the nasal bone can be easily manipulated. However, if definitive treatment is delayed beyond this time period, fibrosis may cause decreased mobility of the nasal bones, making closed reduction of the fracture more challenging.
Anesthesia
Another area of controversy in the management of the acute nasal fracture is the type of anesthe­sia administered during the surgical repair. anesthesia with IV sedation, for instance, minimizes the potential risks of general anesthesia, such as nausea. General anesthesia, however, provides the benefit of a controlled airway as well as the oppor­tunity for uncompromised nasal examination, re­duction, and manipulation. Typically, a topical vasoconstrictive agent, such as oxymetazoline or 4% liquid cocaine, is applied to cottonoid pledgets that are then placed in the nasal passageway to mini­mize bleeding while a local anesthetic, such as 1% lidocaine with epinephrine (1:100,000), provides further anesthesia and vasoconstriction.
Several factors should be weighed when deciding between local or general anesthesia for the manage­ment of nasal fractures. The first consideration is the patient’s airway. If the surgeon anticipates sig­nificant bleeding following reduction of the nasal fracture, then the surgeon should consider the use
9
The conservative meas-
10
Local
of a short-acting general anesthetic while the airway is secured and protected.
Another consideration is the severity of the nasal fracture, as well as the presence of an associated sep­tal fracture. Since one of the most common causes for persistent nasal deformity following closed reduction of a nasal fracture is unrecognized sep­tal fracture or inadequate reduction, the surgeon should consider the use of a short-acting general anesthetic, which allow the opportunity to properly address the causes of the nasal deformity.
11
Pediat­ric patients should undergo reduction of the nasal fracture under general anesthesia since they are not able to comply with local anesthesia. Finally, patient comfort should also be considered. While some patients may tolerate reduction of nasal fracture under local anesthesia, other patients may prefer a short-acting general anesthetic.
Closed Reduction of Acute Nasal Bone Fracture
The authors prefer the use of the Boise elevator to perform closed reduction of acute nasal bone fractures. The Boise elevator is placed intranasally and the impacted nasal bone is reduced, thus restor­ing the nasal length. The thumb of the contralateral hand is placed over the nasal bone externally to pal­pate subtle osseous movements (Figure 5-6). If the impacted nasal bone is locked under the ascending process of the maxilla, the Boise elevator is used in an upward and outward motion to reduce the fractured nasal bone; the instrument must not be inserted too deeply, as it may rest under the nasal process of the frontal bone and will be of no value. An external splint is always utilized. Additionally, in an effort to minimize the possibility of repeat impaction of the recently reduced nasal bone, an internal nasal splinting can be provided in the form of nasal packing. A small amount of absorbable packing (Gelfoam®, Pfizer) covered with antibiotic ointment strategically positioned intranasally along the medial aspect of the nasal bone usually suffices in maintaining the position of the reduced nasal bone; it is well tolerated by the patient and does not require removal, since it is dissolvable. While a vari­ety of dorsal nasal splints are available, the authors prefer the use of Aquaplast®. First, liquid adhesive (Mastisol®) is applied to the skin. Then, the soft tis­sues of the nose are taped using taping begins at the supratip break to drape the soft tissue in this location intimately to the underlying
1
inch paper tape;
4
/
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Nasal Bone
Figure 5-6. Reduction of nasal fracture.
The Boise elevator is placed transnasally. The surgeon’s contralateral thumb is used to palpate the nasal bone to ensure adequate reduction.
skeleton. Strips of different lengths are then applied in a transverse fashion over the nose, avoiding exces­sive pressure. The Aquaplast® splint is then applied. The external dorsal splint remains in place for one week.
Repair of Septal Fracture
If the septum is deviated, it can be reduced with either an Asch forceps or the Boise elevator to relocate the displaced base to the midline. Next, the septum should be re-evaluated to ensure that proper reduction has been achieved. If the septum remains posteriorly displaced or irreducible, then the authors proceed with an open approach to the septum via a hemitransfixion incision. Once bilat­eral mucoperichondrial flaps are elevated, complete visualization of the septum provides the oppor­tunity to properly identify the extent of the septal injury. In the authors’ experience, a small hematoma may be identified at the bony-cartilaginous junc­tion; this is evacuated with suction. If the inferior aspect of the quadrangular cartilage remains dis­lodged from the vomerine groove, an inferior strip of quandrangular cartilage can be resected, the sep­tum can be re-positioned into the vomerine groove in a swinging-door fashion, and a figure-of-8 suture with 5-0 Monocryl can be used to keep the posterior caudal septum attached to the anterior septal spine in the midline. Once the hemitransifixion incision is re-approximated using interrupted 5-0 plain gut sutures, internal nasal septal splints are placed.
Silicone septal splints are favored to ensure atrau­matic placement and removal. Prophylactic gram­positive antibiotic coverage (typically cephalexin) is prescribed postoperatively and is continued until the silicone splints are removed on postoperative day seven (Figure 5-7).
Immediate Septorhinoplasty
In the literature, some authors advocate an open approach to the nasal pyramid at the time of ini­tial repair, utilizing accepted rhinoplasty techniques, including rasping, osteotomies, and cartilaginous resection or augmentation of the dorsum.12 How­ever, the variables involved in an acute nasal frac­ture, such as irregularity and/or comminution, may make the nasal bones not easily controlled via the external approach. Also, the healing process and unavoidable fibrosis following surgical repair of the acute nasal fracture may cause shifts in the nasal structures. Ultimately, the absence of a detailed preoperative consultation and the imposition of a time-pressured decision for surgery may generate a series of expectations and obscure the transparency required in the patient’s decision to go through an elective aesthetic procedure. Therefore, for patients with acute nasal fractures who are interested in cos­metic septorhinoplasty, it behooves both the sur­geon and patient to consider delaying treatment for at least a few months. However, it is clear that changes will continue to evolve until approximately 1 year after any given traumatic injury.
13
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B
A
C
Figure 5-7. Reduction of septal fracture. Adequate exposure of the fractured septum is achieved via a
hemitransfixion incision. If the septal fracture is along the junction between the vomerine groove and quadrangular cartilage, a strip of cartilage can be removed ( within the vomerine groove. A figure-of-8 suture anchors the quadrangular cartilage caudally to the anterior nasal spine at the midline.
Repair of the Pediatric Nasal Fracture
While it is unclear whether disruption of the human pediatric septal growth center affects the develop­ment of the nose, there is clear evidence from animal models supporting the importance of such growth centers.14 Therefore, closed reduction is the pre­ferred method of treatment of acute nasal fracture in the pediatric population. In order to facilitate a thorough examination and complete reduction, general anesthesia is used for the pediatric patient. The technique for closed reduction is similar to that previously described. However, there are a few caveats. For example, internal splinting is typically performed with light absorbable packing, such as Gelfoam®, thus obviating the need for removal dur­ing the postoperative period. Finally, the guardians of the pediatric patient should be properly coun­seled about the possibility of the child’s developing delayed nasal deviation and obstruction and may, therefore, be warned of the possibility of a need for formal septorhinoplasty in the future.
black dotted line
) and the cartilage repositioned
Complications
Potential complications of repair of the acute nasal fracture include epistaxis and septal hematoma. Epistaxis is usually self-limiting; however, if it is per­sistent, oxymetazoline nasal spray, elevation of the head of the bed, and application of cold compresses can be utilized to decrease or stop bleeding. If a sep­tal hematoma is appreciated in the postoperative period, it is dealt with in a manner similar to that described earlier in this chapter. Posttraumatic nasal deformity following reduction efforts is another potential complication. A review of the medical lit­erature demonstrates the frequency of this compli­cation ranges from 14% to 50%.15 Further analysis of the data suggests that a possible reason for such a high complication rate is the use of closed tech­niques to repair the fractured nasal bone and fail­ure to address septal injuries. Indeed, Rohrich and Adams demonstrated a much smaller rate, 9%, of posttraumatic nasal deformity following reduction efforts when the septum was properly evaluated
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and open treatment of the septum was performed when indicated.
13
Conclusion
A detailed history, including the mechanism of injury, and a thorough physical examination pro­vide important information in the treatment of acute nasal fractures. Soft- tissue edema, which inevitably accompanies acute nasal fractures, may limit the physical examination; therefore, decisions about definitive therapy should be delayed until the edema has resolved and any underlying acquired nasal deformity can be fully appreciated. It is impor­tant to identify and to treat septal hematoma early in the process. Definitive treatment should not be delayed beyond 2 weeks, because fibrosis will make mobilization of the fractured nasal bones more diffi­cult. While there are different of methods for reduc­ing and treating acute nasal fractures, it is important not to overlook the septum and to address any exist­ing septal deviations or fractures at the same time as the bony fractures in order to minimize the inci­dence of post-reduction nasal deformities requiring subsequent surgical interventions.
Acknowledgments
The authors acknowledge Nancy A. Rothrock for her assistance in the preparation of digital images.
References
1. Perkins SW, Dayan SH. Management of nasal trauma. Aesthetic Plast Surg 2002;26(Suppl 1):S3.
2. Erdman D, Fllmar KE, Debruijin M, et al. A retrospec­tive analysis of facial fracture etiologies. Ann Plast Surg 2008;60(4):398–403.
3. Guyuron B. Does rhinoplasty make the nose more susceptible to fracture? Plast Reconstr Surg 1994;93(2): 313–317.
4. Imahara SD, Hopper RA, Wang J, et al. Patterns and outcomes of pediatric facial fractures in the United States: a survey of the National Trauma Data Bank. J Am Coll Surg 2008;207(5):710–716.
5. Hughes CA, Harley EH, Milmore G, et al. Birth trauma in the head and neck. Arch Otolaryngol Head Neck Surg 199;125(2):193–199.
6. Murray JA, Maran AG, Busuttil A, et al. A pathological classification of nasal fractures. Injury 1986;17(5):338–344.
7. Teichgraeber JF, Wainwright DJ. The treatment of nasal valve obstruction. Plast Reconstr Surg 1994;93: 1174–1182.
8. Fischer H, Gubisch W. Nasal valves: importance and surgical procedures. Facial Plast Surg 2006;22: 266–280.
9. Ridder GJ, Boedeker CC, Fradis M, et al. Technique and timing for closed reduction of isolated nasal frac­ tures: a retrospective study. Ear Nose Throat J 2002;
81(1):49–54.
10. Khwaja S, Pahade AV, Luff D, et al. Nasal fracture
reduction: local versus general anesthesia. Rhinology 2007;45(1):838.
11. Rohrich RJ, Adams WP. Nasal fracture management:
minimized secondary nasal deformities. Plast Reconstr Surg 2000;106(2):266–273.
12. Reilly MJ, Davison SP. Open vs closed approach to
the nasal pyramid for fracture reduction. Arch Facial Plast Surg 2007;9(2):82–86.
13. Renner GJ. Management of nasal fractures.
Otolaryngol Clin N Am 1991;24(1):195–213.
14. Sarnat BG. Normal and abnormal growth at the
nasoseptovomeral region. Ann Otol Rhinol Laryngol 1991;100(6):508–515.
15. Rohrich RJ, Adams WP. Acute nasal fracture manage-
ment: minimizing secondary deformities. In Gunter JP, Rohrich RJ, Adams WP (eds). Dallas Rhinoplasty. St. Louis, Quality Medical Publishing, 2007, pp. 957–971.
Secondary Rhinoplasty
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with Total Lobular Reconstruction
Henry D. Sandel IV, MD and Stephen W. Perkins, MD
6
In primary rhinoplasty, contouring and sculpt­ing the nasal tip may be the most challenging and technically difficult aspects, and their outcome is dependent upon the delayed effects of long-term healing. Factors affecting the results include the pre-existing anatomy, the specific surgical maneu­vers performed, the scar contracture, and the long­term healing. Depending upon what was done in the primary operation, the long-term effects of scar contracture and surgically altered lobular cartilages may cause less than ideal aesthetic and functional results. Fortunately for those patients who have suf­fered the adverse consequences of poorly designed surgical procedures or the effects of overly aggres­sive excisional surgery of the distal third of the nose, it is possible to reconstruct the compromised nasal structure, in most cases. The ability of an experi­enced rhinoplasty surgeon to dismantle and then to rebuild the entire lobule is vitally important for correcting the variety of problems encountered in revision or secondary surgery of the nasal lobule. Revisions of the internal and external nasal valve are often intimately interconnected in secondary rhi­noplasty. Correcting deviations and abnormalities of the nasal pyramid and middle nasal vault often coincides with the need for total lobular reconstruc­tion in secondary rhinoplasty. Most secondary nasal reconstructions involve the use of a great amount of autogenous cartilage: septal, conchal, or rib grafts. Occasionally, alloplastic materials are used as well to provide additional contour improvement in
severely deformed nasal pyramids. Alloplastic graft­ing should never be used in reconstructing the nasal lobule, however.
Because multiple grafts in the nasal lobule are required, an external columellar incision or an open approach is used in nearly all such cases. This affords direct visualization, allowing the surgeon to identify anatomical distortions using binocular vision and bimanual palpation and to suture grafts in place to restore the dynamic function of the nasal valves, both internal and external.1 In addition, mul­tiple grafts in the nasal lobule are used to achieve an aesthetic contour and to restore the tip-support structures. Using this approach and a series of grad­uated steps, one can correct both the aesthetic and the functional components of the adverse results of a primary rhinoplasty.
The need for revision nasal surgery arises “due to poor aesthetic judgment on the part of the surgeon, the surgeon’s inexperience, and the inevitable need for a secondary operation in a difficult primary rhi­noplasty,” according to Converse. of the distal third of the nose frequently involves undiagnosed or improperly managed persistent septal deformities, asymmetries or inappropriate configurations of the nasal tip cartilages, failure to recognize inherent weaknesses, failure to recognize cephalic malposition of lateral crura, and a failure to recognize and treat nasal valve collapse, with or without alar contraction (Figure 6-1). Accord­ing to Webster, “any adverse scar formation and
2
Revision surgery
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ABC
DEF
Bilateral alar struts
Single and double dome sutures
Plumping graft
Columellar strut
G
Figure 6-1. (A) Pre operative patient with cephalic malposition of alar cartilages. (B) Post operative narrowing
the broad trapezoid tip with only single and double dome sutures. (C) Repair of external alar collapse with alar strut grafts. (D) Pre operative patient with cephalic malposition of alar cartilages. (E) Post operative narrowing the broad trapezoid tip with only single and double dome sutures. (F) Repair of external alar collapse with alar strut grafts. (G) Drawing indicating repair of external alar collapse with alar strut grafts.
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inherent weaknesses of the patient’s own cartilage, or over aggressive resection of alar cartilages, will ultimately result in the need for revision surgery given a longer term timeline of healing.”3 The need for revision surgery may not become apparent for 5 to 10 years postoperatively, but it will ultimately cause functional and aesthetic deformities. The quality of the patient’s skin, even in the primary operation, has direct effects on the results of surgery and may have a profound effect on the surgeon’s ability to achieve a satisfactory aesthetic result in secondary surgery. Thick, oily skin with excessive scar tissue from previous surgery or overly weak or over-resected cartilages with thick skin often lead to loss of definition in the lobular area, as well as val­vular collapse. According to Tardy, “The quality of the tip skin and subcutaneous tissues [is] often the limiting factor in achieving the desired tip refine­ment.”4 In an attempt to gain more definition of the nasal tip, the inexperienced surgeon may over­resect the cartilages, ultimately resulting in a con­tracted, scarred nasal lobule versus one with proper tip support and structure that the skin envelope can mold to.
As mentioned, a common cause of a poor result in primary lobular surgery is the failure to recognize and to preserve the important tip-support mecha­nisms. Major tip-support mechanisms include: (1) the size, strength, length, and resiliency of the lower lateral cartilages, (2) the attachment of the medial crural feet to the caudal border of the sep­tum, (3) the attachment of the upper lateral car­tilages to the cephalic border of the alar cartilages (i.e., the ‘returning’), and (4) the fibrous connec­tions between the anterior septal angle and the alar cartilages (the interdomal ligament).5 Other tip­support mechanisms include the skin envelope itself, as defined and described by Dyer in his dis­cussion of “tensegrity.”6 The nasal septum contrib­utes to tip support, as do the anterior nasal spine, the membranous septum, and the sesamoid cartilage complex at the piriform aperture. Preservation and/ or the reconstitution of these tip-support mecha­nisms is critically important to prevent the loss of tip support, which would ultimately result in a poor aesthetic and functional result. Often, in secondary rhinoplasty, the surgeon is faced with disruption of multiple tip-support mechanisms; the surgeon’s skills, ability, and experience in rebuilding the entire lobule and reconstructing tip-support mechanisms will result in a restored aesthetically pleasing and functional nasal lobule.
The rate of revision surgery in rhinoplasty has been debated; rates have been quoted between 5% and 27% of all rhinoplasties performed. Revision rates among experienced rhinoplastic surgeons provide an indication of how complex the primary operation is and how commonly secondary rhino­plasty is performed. Reese stated that, “A surgeon’s ideal rate of revision should be in the range of 5–10%.”7 Most studies on revision surgery report a range of 10% to 12%. Kamer reported in 1988 that, of all the rhinoplasties he performed over a 3-year period, his revision rate was between 7% and 9%.8 Although this seems to be a fairly high revision rate for a highly experienced rhinoplasty surgeon, most of the revisions were for minor deformities that required small touchups due to the increasing sophistication of his patient population. It is this author’s experience that the rate of revision surgery is between 5% and 7%: 7% of primary rhinoplasties on the nasal pyramid required revision surgery and 5% of primary nasal lobular rhinoplasties required revision surgery.9 Statistics among all studies show that the largest percentage of patients undergoing secondary surgery of the nasal lobule required this because the tip was still too bulbous.” Recently, it has been suggested that the majority of patients requiring revision surgery require improvement of the lateral nasal wall, of recurvature of the alar car­tilages, and of frank valvular collapse.10 Lesser, but important, reasons for lobular reconstruction are development of bossae and asymmetries of the nasal tip itself. Kamer’s study also revealed that, while the majority of patients required only one revision, almost one-quarter of the patients (23%) required two revision procedures. He reported that about 45% of patients requiring revision had at least two, if not three or more, deformities that required cor­rection at the time of the secondary lobuloplasty.9 In recent years, with the increasing use of the external columellar approach and the large number of grafts placed in the lobule, newer indications for revision surgery are related to the grafts themselves and the “shrink wrap phenomenon” in the thinning nasal skin around the newly reconstructed lobule, whether it be from primary or secondary rhinoplasty proce­dures.11 While grafts often are required to prevent collapse of the external nasal valve and for stabiliza­tion of the nasal lobule and reconstitution of the tip­support mechanisms, the grafts become reasons for revision surgery in themselves when they become visible (Figure 6-2). Therefore, it is extremely impor­tant for the surgeon, whether performing primary
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