Quantification of axonal ingrowth and functional recovery in a myocutaneous flap model in rats with strong clinical implications.

The process of reinnervation, an important component of functional restoration after flap transfer, is understudied, making it necessary to carry out a further investigation for delineation of the exact timeline. Seventy-six Sprague-Dawley rats were used as the experimental animals. An anatomic study was first conducted to clarify the pattern of nerve distribution in the dorsal skin of 16 rats. Afterward, a myocutaneous flap was harvested on the right flanks of 40 rats, which were then assigned into seven time points. At each time point, skin samples were harvested and immunofluorescent staining was performed using α-Bungarotoxin, and antibodies against NF-200, p75, α-SMA, and TH. One-way analysis of variance was adopted for comparison of nerve density after surgery. For evaluation of functional return, cutaneous trunci muscle reflex (CTMr) test was performed on 10 additional rats, and the Chi-square test was used for comparison of reflex intensity among six time points after surgery. The outcomes revealed that the cutaneous branches from the intercostal nerves and the dorsothoracic nerve from the brachial plexus could be found entering the dorsal skin, distributed in the skin proper and the panniculus carnosus, respectively. After flap surgery, full spontaneous reinnervation of the skin proper and vessels within the flaps could be achieved at day 180. However, if the stumps of cutaneous branches of the intercostal nerves were damaged, the nerve density in the skin proper underwent a 2/3 decline. The panniculus carnosus in the cranial part had a much better reinnervation than that in the caudal part. The CTMr test showed that the flap could regain most of its sensate and motor activity. Our study shows that strong spontaneous reinnervation could be expected after flap surgery. The pattern of the original nerve distribution in both the recipient and donor sites may have a big impact on the reinnervation of the flap.

One-stage reconstruction by dual-innervated double muscle flap transplantation with the neural interconnection between the ipsilateral masseter and contralateral facial nerve for reanimating established facial paralysis: A report of 2 cases.

The authors developed a one-stage double-muscle reconstruction technique for facial paralysis using a latissimus dorsi (LD) flap and a serratus anterior (SA) flap, which were dually reinnervated by the contralateral facial nerve (FN) and ipsilateral masseter nerve (MN). The procedure was performed for 61-year-old man 3-years after resection of a malignant tumor and a 24-year-old woman 10-years after temporal fracture with facial paralysis. A double-muscle flap comprising left LD and SA flaps was harvested, a 15-cm thoracodorsal nerve (TN) section was attached to the LD flap, and 5-cm and 1-cm sections of the long thoracic nerve (LTN) were attached to the proximal and distal sides of SA flap. The LD flap and SA flap were sutured along the direction of motion of the zygomaticus major and risorius muscles, respectively. The contralateral FN and ipsilateral MN were interconnected by nerve suturing: the medial branch of TN to the distal end of LTN, the proximal end of LTN to the ipsilateral MN, and the buccal branch of contralateral FN to the main trunk of TN. After surgery, good contraction of the transferred flaps resulted in reanimation of a natural symmetrical smile; no complications were observed during the 12-month follow-up period.

Reconstruction of the Urethral Sphincter with Dynamic Graciloplasty in a Male Rabbit Model.

INTRODUCTION: The use of artificial urinary sphincters can improve urinary incontinence after radical prostatectomies; however, complications can arise. We hypothesized that dynamic graciloplasty improves urethral sphincter reconstruction. MATERIALS AND METHODS: Models of urethral sphincter muscle reconstruction were developed in 5 adult rabbits by wrapping the gracilis muscle flap around the urethra. Intra-urethral pressure was measured in each of the models before reconstruction (control), after reconstruction, and after electrical stimulation of the flap in reconstructed models (stimulated models). RESULTS: The mean maximum urethral closure pressure was significantly greater in the reconstruction model (69.7 (66.5-115.8) mm Hg) than in the control model (39.2 (33.7-49.6) mm Hg). The mean integral of the urethral pressure and urethral length was also significantly greater in the reconstruction model than in the control model. Furthermore, sphincter tightening was enhanced by the electrical stimulation of the flap. CONCLUSIONS: Our results support our hypothesis that the functional reconstruction of urethral sphincters using muscle flaps is promising for the treatment of urinary incontinence.

Herpes zoster in a free transverse rectus abdominis myocutaneous flap after delayed breast reconstruction: evidence of spontaneous reinnervation.

In concert with advances in surgical reconstruction techniques and improved survival after breast cancer, both the aesthetic and functional outcomes, especially sensory recovery, of breast reconstruction have been addressed. Most studies on sensory recovery in reconstructed breasts have utilized patients' subjective responses to touch, pain, temperature, and pressure. In contrast, this report describes a case of herpes zoster that developed in a free transverse rectus abdominis myocutaneous flap, which provides objective evidence of spontaneous reinnervation after breast reconstruction.

The functional free innervated medial gastrocnemius flap.

BACKGROUND: The functional free innervated medial gastrocnemius flap has been described in four previous articles for the management of foot drop, Volkmann contracture, and upper limb muscle defects. We expand the indications by describing the use of free innervated medial gastrocnemius musculocutaneous flap in functional reconstruction of the tongue and upper limb musculature. METHODS: The right medial gastrocnemius muscles were raised as myocutaneous flaps in six patients. These flaps were elevated in the supine position and the flaps included a motor nerve from the sciatic nerve and a sensory nerve from the sural nerve. The average size of flap was 15 × 8 cm. RESULTS: The flaps were transferred successfully with no flap loss and showed consistent reinnervation during follow-up. In particular, all patients who underwent tongue reconstruction exhibited intelligible speech and returned to full oral diet with no aspiration. In patients who underwent upper limb muscle reconstructions, there was moderate to full restoration of power. All donor sites exhibited excellent symmetry in both power and appearance to the contralateral calf. CONCLUSIONS: To our knowledge, this study is the first to describe the use of the innervated medial gastrocnemius free flap in the reconstruction of the tongue and deltoid. The advantages of this flap include its thin reliable skin paddle, strong bulky bipennate muscle, and low donor site morbidity.

[Free re-innervated Latissimus Dorsi musculocutaneous flap for treat congenital Volkmann ischemic Contracture: a case report]. / À propos d'un cas exceptionnel de syndrome de Volkmann néonatal traité par transfert libre de grand dorsal ré-innervé

OBJECTIVES: Congenital Volkmann ischemic contracture is a rare entity. The neonate presents nerve palsy, cutaneous and muscular necrosis of the forearm. METHODS: We report a case of a newborn who presented with necrotic subcutaneous tissue of the right forearm and absence of active flexion and extension of the wrist and fingers. She was initially treated with debridement of necrotic tissues and orthosis of the wrist. Latissimus dorsi free flap was used for forearm reconstruction at age of 7months. The thoracodorsal nerve was anastomosed with a motor branch of the median nerve. The proximal part of the muscle was fixated to the lateral epicondyle of humerus, and the distal part of muscle was sutured with a flexor digitorum tendons and radial extensor carpi. The cutaneous component of the flap was used to cover a defect of soft tissue of the forearm. RESULTS: At age of 12 months, the patient has a good two-hand function with a pollici digital clamp of the right hand. She also has a recovery of active wrist extension and fingers flexion. DISCUSSION: Free re-innervated latissimus dorsi muscle transfer is an alternative to restore a useful hand function in case of congenital Volkmann ischemic contracture.

[Investigation of simple and complex prelamination of vascularized flaps in experiment].

Prelamination, permitting improvement not esthetics only, but also function of the damaged region, to create necessary, by contents and configuration, vascularized complexes of tissues, is applied for effective treatment of complex defects in tissues. In experiment on laboratory animals for prelamination of vascularized flaps were applied separate and combined placement of mucosal and cartilaginous autotransplants. Results of the investigation witness possibility and efficacy of creation of content--component complexes of tissues, owing necessary characteristics for their further application in the clinic during performance of reconstructive interventions.

Application of Botulinum Neurotoxin Injections in TRAM Flap for Breast Reconstruction: Intramuscular Neural Arborization of the Rectus Abdominis Muscle.

Breast reconstruction after mastectomy is commonly performed using transverse rectus abdominis myocutaneous (TRAM) flap. Previous studies have demonstrated that botulinum neurotoxin injections in TRAM flap surgeries lower the risk of necrosis and allow further expansion of arterial cross-sectional diameters. The study was designed to determine the ideal injection points for botulinum neurotoxin injection by exploring the arborization patterns of the intramuscular nerves of the rectus abdominis muscle. A modified Sihler's method was performed on 16 rectus abdominis muscle specimens. Arborization of the intramuscular nerves was determined based on the most prominent point of the xyphoid process to the pubic crest. All 16 rectus abdominis muscle specimens were divided into four muscle bellies by the tendinous portion. The arborized portions of the muscles were located on the 5-15%, 25-35%, 45-55%, and 70-80% sections of the 1st, 2nd, 3rd, and 4th muscle bellies, respectively. The tendinous portion was located at the 15-20%, 35-40%, 55-60%, and 90-100% sections. These results suggest that botulinum neurotoxin injections into the rectus abdominis muscles should be performed in specific sections.

Neurotized Free Platysma Flap for Functional Eyelid Reconstruction: A Cadaveric Study of Anatomical Feasibility.

BACKGROUND: Conventional reconstructive options for large full-thickness eyelid defects are limited to static local flaps without replacing the missing orbicularis. The authors' aim is to delineate the platysma neurovascular anatomy for innervated functional eyelid reconstruction. METHODS: Fourteen fresh latex-injected heminecks were dissected. The locations where neurovascular structures entered the platysma muscles were expressed as the percentage distance ± SD from the sternocleidomastoid muscle mastoid insertion to manubrium origin. RESULTS: The superior thyroid, facial, and lingual vessels were the major pedicles in eight of 14 (57.1 percent), four of 14 (28.6 percent), and one of 14 specimens (7.1 percent), respectively. In one specimen (7.1 percent), both the superior thyroid and facial vessels supplied a major pedicle. Venous drainage generally mirrored arterial inflow but was redundant, with 43 percent and 14 percent of flaps also with major contributions from the external jugular and anterior jugular veins, respectively. Neurovascular pedicles entered the platysma 28 to 57 percent caudal to the sternocleidomastoid muscle mastoid insertion, between 0.5 and 4.8 cm anterior to the medial sternocleidomastoid muscle border. CONCLUSION: Although variability exists, platysma neurovascular pedicles enter at predictable locations between 28 and 57 percent of the distance from the mastoid insertion of the sternocleidomastoid muscle, therefore making free platysma transfer a feasible option for eyelid reconstruction.

Modifield musculocutaneous gracilis flap A case report.

A heterogeneous range of malignant pathologies affects vulvar and perineal regions. Today standard radical mutilating surgery for the treatment of invasive vulvar carcinoma is being replaced by a conservative and individualized approach. Defects of the external pelvis and perineal lining are usually reconstructed with local or regional fasciocutaneous flaps. However, in particular situations, the asymmetrical distribution of the defect and its location, close to sources of infec-tion such as the perineal area, may suggest a different approach. This report presents a patient who underwent conservative vulvectomy bilaterally and reconstruction with a unilateral modified gracilis flap. A V shaped incision was designed in the skin paddle of the flap, allowing it to fit the loss of substance around the remaining vulvar skin. Patient was highly satisfied with the result, she had no pain, no problem in defecation or urination nor during deambulation. In case with asymmetrical defect in the vulvo-perineal area the modified gracilis flap can be considered as a valid reconstructive option. KEY WORDS: Modified gracilis flap, Vulvo-perineal reconstruction.

Dynamic tongue reconstruction with innervated gracilis musculocutaneos flap after total glossectomy.

OBJECTIVE: Advanced tongue cancer treated with total glossectomy with laryngeal preservation (TGLP) has a high risk of severe postoperative morbidity due to the loss of swallowing and articulation ability. The purpose of our work is to highlight the potential of the innervated gracilis musculocutaneous flap (IGMF) to permit a good quality of life in patients after undergoing this kind of surgery, particularly when associated with an adequate rehabilitation course. METHODS: We are presenting a cohort of 15 patients with T3 or T4 tongue cancer treated with TGLP and dynamic reconstruction with IGMF between 1998 and 2016. Functional outcome data were collected employing flexible endoscopic examination of swallowing, as well as swallowing and speech tests and questionnaires. Our reconstructive procedure was compared with different techniques described in the literature. RESULTS: In 13 out of 15 patients, a positive functional outcome was recorded, defined as the achievement of an adequate swallowing and speech ability. In two patients, the lack of success was caused by the flap's necrosis and death from early pulmonary metastasis. Of 13 patients, 12 were still alive after 2 years. Ten patients regained an independent feeding by mouth for normal food, whereas three patients continued percutaneous endoscopic gastrotomy supplementation. After 40 months, all 13 patients displayed a moderately intelligible speech capability. CONCLUSION: Although TGLP can have devastating morbid effects, an appropriate dynamic reconstruction-along with an adequate course of rehabilitation-can provide good swallowing and articulation outcomes, which permit a satisfactory long-term quality of life. LEVEL OF EVIDENCE: 4 Laryngoscope, 129:76-81, 2019.

The innervated rectus abdominis flap for quadriceps reconstruction.

BACKGROUND: The vertical rectus abdominis myocutaneous (VRAM) and transverse rectus abdominis myocutaneous (TRAM) flaps have traditionally been excluded from consideration of reconstructions with functional potential, because of their segmental innervation. We present a case series that aimed to demonstrate that segmental innervation does not preclude successful neural anastomoses and can deliver a functional reconstruction of a total compartment in the anterior thigh. METHODS: This review included all patients who required total anterior thigh compartmentectomy and reconstruction between December 2009 and February 2016 were included from the first author's prospective database. RESULTS: Eleven cases were identified, with innervated rectus abdominis flaps used for anterior thigh reconstruction. During the median follow up period of 12 months, all patients had reinnervation of the rectus with six reaching M5, one M4+, one M4, two M3 and one M2, according to Medical Research Council power grades. CONCLUSION: All patients had successful functional reconstruction in the thigh using the rectus abdominis myocutaneous flap.

The platysma myocutaneous flap.

Reconstructing defects of the oral mucosa or skin of the lower one-third of the face can be accomplished by a variety of techniques. This article presents two versions of the platysma myocutaneous flap, which is a reliable, axial pattern, pedicled flap capable of providing excellent one-stage reconstruction of such defects. As discussed herein, the superiorly based and posteriorly based versions of the flap have wide application in the oral and facial region. Also provided is a review of other uses of this flap in head and neck surgery.

The sensate fibula osteocutaneous flap: neurosomal anatomy.

BACKGROUND: Rapid return of oral sensation enhances quality of life following oromandibular reconstruction. For predictable reinnervation of flaps, a detailed knowledge of their nerve supply is required. This study was designed to investigate the cutaneous nerve supply of the fibula osteocutaneous flap. METHODS: We dissected thirty-seven fresh cadaveric specimens to better understand the cutaneous innervation of the typical fibula flap that would be used in oromandibular reconstruction. In addition, ten volunteers were enlisted for nerve blocks testing the cutaneous innervation of the lateral aspect of the lower leg. RESULTS: The lateral sural cutaneous nerve (LSCN) is generally considered to be sole cutaneous innervation to the lateral aspect of the lower leg; however, our analysis of the cadaveric specimens revealed dual innervation to this region. We identified a previously unnamed distal branch of the superficial peroneal nerve, which we have termed the recurrent superficial peroneal nerve (RSPN). Given the cadaveric findings, both the LSCN and the RSPN were tested using sequential nerve blocks in 10 volunteers. An overlapping pattern of innervation was demonstrated. CONCLUSIONS: The lateral aspect of the lower leg has an overlapping innervation from the LSCN and the newly described RSPN. The overlap zone lies in the region of the skin paddle of the fibula flap. The exact position of the neurosomal overlap zone (N.O.Z.E.) may be an important factor in reestablishing sensation in the fibula's skin paddle following free tissue transfer.

The sensate fibular osteoneurocutaneous flap in oromandibular reconstruction: clinical outcomes in 31 cases.

Thirty-one patients requiring composite mandibular resection were reconstructed with sensate fibula osteocutaneous flaps. Preoperatively, all patients underwent lower extremity sensory testing at the location of the proposed flap site. Intraoperatively, either the Lateral Sural Cutaneous Nerve (LSCN) or the Recurrent Superficial Peroneal Nerve (RSPN) was chosen as donor. It was then joined to either the lingual or the greater auricular nerve. Both end-to-end and end-to-side neurorrhaphies were used. At least six months postoperatively, the intraoral flaps were tested for sensory function. Twenty-eight patients achieved sensory return, including hot/cold and pinprick sensation. Both the LSCN and RSPN groups demonstrated improved two-point discrimination in static and moving studies. Better results were obtained when the lingual rather than the greater auricular nerve was the recipient. Only three patients underwent end-to-side repair, with improved two-point discrimination in two patients. The average follow-up for all patients was 11.7 months. The most dramatic return of sensory function was seen in the end-to-end lingual nerve neurorrhaphies, followed by end-to-side lingual nerve neurorrhaphies. Of the five repairs using the greater auricular nerve, only three demonstrated any measurable postoperative sensory return. Functional outcomes of postoperative patients were measured via analysis of speech, type of food consumption, and oral continence. The majority of patients exhibited normal or easily intelligible speech, was able to consume a soft food or normal diet, and could maintain normal to manageable oral continence. A subset of patients enrolled in the study went on to pursue dental rehabilitation.

Breast reconstruction with the denervated latissimus dorsi musculocutaneous flap.

OBJECTIVE: To analyze clinical implications of the thoracodorsal nerve division in the latissimus dorsi musculocutaneous flap breast reconstruction. PATIENTS AND METHODS: Prospective cohort study was conducted on 29 patients. Breast reconstruction with latissimus dorsi musculocutaneous flap was performed unilaterally in 20 patients or bilaterally in 9 women (38 breasts). Thoracodorsal nerve was divided during reconstruction of 20 breasts (group 1) and was preserved for 18 breasts (group 2). Height, width, projection, area of the covering skin and volume of the reconstructed and healthy breasts were measured on the 3D images of the anterior chest wall, taken 6 weeks and 6 months postoperatively with the Di3D 3D camera. Data regarding tissue consistency, painfulness and animation of the reconstructed breast, symmetry of both breasts and overall satisfaction after the surgery were collected at 6 months. RESULTS: The reconstructed and healthy breasts decreased in volume in group 1 (-45.85 cm(3) ± 48.41 cm(3), p = 0.0004; -29.13 cm(3) ± 14.98 cm(3), p = 0.0009) and in group 2 (-31.5 cm(3) ± 25.35 cm(3), p = 0.0001; -15.4 cm(3) ± 21.96 cm(3), p = 0.0537). There were no differences in decrease in volume between groups 1 and 2 (p > 0.05). Respondents in group 1 in comparison to group 2 showed similar satisfaction of the tissue consistency of the reconstructed breast (p > 0.05) and the level of symmetry between both breasts (p > 0.05), gave lower scores for painfulness (p < 0.0001), animation (p < 0.0001) and higher scores for the overall satisfaction about the reconstructed breast (p = 0.0001). CONCLUSION: We suggest that division of the thoracodorsal nerve during latissimus dorsi musculocutaneous flap breast reconstruction is a useful undertaking to minimize unnatural animation of the reconstructed breast.