Morphology and arterial supply of the pyramidalis muscle in an Australian female population using computed tomography angiography.

INTRODUCTION: The structure and function of the human anterolateral abdominal wall have been thoroughly described. However, there has been limited anatomical study of the pyramidalis muscle and its arterial supply. The aim of this study was to analyse the patterns of arterial supply to the pyramidalis in a female population. METHODS: A retrospective study of 32 computed tomography angiography scans of the abdominal wall of adult women was performed to assess the prevalence (bilateral or unilateral presence, or absence), morphology (medial border height, base width and thickness) of pyramidalis and patterns of arterial supply. RESULTS: Pyramidalis prevalence was bilateral in 75% of computed tomography angiography studies (24/32), unilateral in 6.3% (2/32) and absent in 18.8% (6/32). Of the five patterns of pyramidalis arterial supply observed and described in detail, the most frequent (68%, 34/50 of cases) originated from an exclusive muscular branch of the inferior epigastric artery. Origin from the pubic branch of the inferior epigastric artery was seen in 4% (2/50). There was a single case (2%, 1/50) of artery origin from a variant obturator artery, a common trunk with the pubic branch from the inferior epigastric artery, and from the muscular branch to rectus abdominis. The artery could not be defined in 22% (11/50). CONCLUSION: In this computed tomography angiography study of women, five patterns of Pyramidalis arterial supply were identified. In the majority of cases, the pyramidalis derived its arterial supply from an exclusive, isolated muscular branch of the inferior epigastric artery.

Anatomical observations on 30 cadavers: new insights into the relationship between the posterior wall of the inguinal canal and the cremaster.

PURPOSE: Clarify the composition of the Posterior wall of the Inguinal Canal(PWIC), the location and composition of the Transverse Fascia(TF), and the tissue origin of the Cremaster(C) by observing the anatomy of the inguinal region of the cadaver. METHODS: 30 cadavers were dissected to observe the alignment of the muscles and fascia of the inguinal canal and the anterior peritoneal space. the anatomical levels of the posterior wall of the inguinal canal and the alignment of the Spermatic Cord(SC) were observed. RESULTS: (1) The posterior wall of the inguinal canal was white, bright, and tough tendon membrane-like tissue; (2) the transverse fascia was a thin fascial tissue with only one layer of membranous structure located in the abdominal wall under the abdominal wall on the side of the blood vessels of the peritoneal cavity; (3) the internal oblique muscle and its tendon membrane, and the transversus abdominis muscle and its tendon membrane extended on the surface of the spermatic cord, and fused and continued to the cremaster on the surface of the spermatic cord. CONCLUSIONS: 1. PWIC is mainly composed of Internal oblique muscle of abdomen (IOMA), Aponeurosis of internal oblique muscle of abdomen (AIOMA), Transverse abdominal muscle (TAM), and Transverse abdominal aponeurosis(TAA) as the following four types: (1) TAM and AIOMA fused to form a tendinous layer; (2) IOMA and TAM form the posterior wall of the muscle in the PWIC; (3) IOMA and AIOMA continue in the PWIC; 4) TAM and TAA continue in the PWIC. 2.TF is a thin fascial tissue with only one layer of membrane structure, TF is not involved in the composition of PWIC, so this fascia has nothing to do with resisting the occurrence of inguinal hernia. 3. The spermatic cord that travels in the inguinal canal is fixed to the lower wall of the inguinal canal by the tendon membrane of the cremaster, which is organized from the internal oblique and transversus abdominis muscles and their tendon membranes, The inguinal canal is a musculotendinous canal.

Increasing DIEA Perforator Detail in Three-Dimensional Photorealistic Volume-Rendering Visualizations.

SUMMARY: Preoperative computed tomographic angiography is increasingly performed before perforator flap-based reconstruction. However, radiologic two-dimensional thin slices do not allow for intuitive interpretation and translation to intraoperative findings. Three-dimensional volume rendering has been used to alleviate the need for mental two-dimensional to three-dimensional abstraction. Even though volume rendering allows for a much easier understanding of anatomy, it currently has limited utility, as the skin obstructs the view of critical structures. Using free, open-source software, the authors introduce a new skin-masking technique that allows surgeons to easily create a segmentation mask of the skin that can later be used to toggle the skin on and off. In addition, the mask can be used in other rendering applications. The authors use Cinematic Anatomy for photorealistic volume rendering and interactive exploration of computed tomographic angiography with and without skin. The authors present results from using this technique to investigate perforator anatomy in deep inferior epigastric perforator flaps and demonstrate that the skin-masking workflow is performed in less than 5 minutes. In Cinematic Anatomy, the view onto the abdominal wall and especially onto perforators becomes significantly sharper and more detailed when no longer obstructed by the skin. The authors perform a virtual, partial muscle dissection to show the intramuscular and submuscular course of the perforators. The skin-masking workflow allows surgeons to improve arterial and perforator detail in volume renderings easily and quickly by removing skin and could alternatively be performed solely using open-source and free software. The workflow can be easily expanded to other perforator flaps without the need for modification.

Vascular Anatomy and Variations of the Anterior Abdominal Wall - Significance in Abdominal Surgery.

Detailed knowledge of the human anatomy is an integral part of every surgical procedure. The majority of surgery related complications are due to a failure to possess appropriate knowledge of human anatomy. However, surgeons pay less attention of the anatomy of the anterior abdominal wall. It is composed of nine abdominal layers, which are composed of fascias, muscles, nerves, and vessels. Many superficial and deep vessels and their anastomoses supply the anterior abdominal wall. Moreover, anatomical variations of these vessels are often presented. Intraoperative and postoperative complications associated with entry and closure of the anterior abdominal wall could compromise the best surgical procedure. Therefore, sound knowledge of the vascular anatomy of the anterior abdominal wall is fundamental and a prerequisite to having a favourable quality of patient care. The purpose of the present article is to describe and delineate the vascular anatomy and variations of the anterior abdominal wall and its application in abdominal surgery. Consequently, the most types of abdominal incisions and laparoscopic accesses will be discussed. Furthermore, the possibility of vessels injury related to different types of incisions and accesses will be outlined in detail. Morphological characteristics and distribution pattern of the vascular system of the anterior abdominal wall is illustrated by using figures either from open surgery, different types of imaging modalities or embalmed cadaveric dissections. Oblique skin incisions in the upper or lower abdomen such as McBurney, Chevron and Kocher are not the topic of the present article.

Exploring the match between the degradation of the ECM-based composites and tissue remodeling in a full-thickness abdominal wall defect model.

The repair of abdominal wall defects is currently a clinical challenge. A naturally derived extracellular matrix (ECM) such as small intestine submucosa (SIS) has received great attention in abdominal wall defect repair because of its remarkable bioactivity, biodegradability and tissue regeneration. The match between material degradation and tissue remodeling is very important for the realization of ideal repair effectiveness. In this study, a near-infrared (NIR) fluorescent dye Cy5.5 NHS ester was used to label ECM-based (ECMB) composites consisting of SIS and chitosan/elastin electrospun nanofibers for monitoring material degradation. The tissue remodeling in the ECMB composites for a full-thickness abdominal wall defect repair was systematically investigated by a series of tests including wall thickness measurement, muscle regeneration analysis and angiogenesis assessment. The main findings were: (1) real-time and noninvasive degradation monitoring of the ECMB composites until complete degradation could be realized by chemical conjugation with a Cy5.5 NHS ester. (2) In a full-thickness abdominal wall defect model, the explant thickness could be used as an intuitional indicator for evaluating the tissue remodeling efficiency in the ECMB composites, and the accuracy of this indicator was verified by various examinations including collagen deposition, angiogenesis, and muscle regeneration. The present study could provide new insight into evaluating tissue repair effectiveness of the ECMB composites.

Components separation technique of the abdominal wall: Which muscle release produces the greatest reduction in tension on the mideline?

BACKGROUND: The components separation technique (CS) is used for the reconstruction of complex abdominal wall defects. Release and undermining of the rectus abdominis muscle (RAM) and external oblique muscle (EOM) decrease tension on the abdominal midline, reducing recurrence of ventral hernia, but causes major changes in the physiology of abdominal wall. The purpose of the study was to determine which muscle release and undermining produces the lowest tension on the midline. METHODS: Twenty fresh cadavers were dissected and the anterior and posterior layers of the rectus sheath were isolated in the midline. The forces necessary to advance the layers of the rectus sheath to the mid abdomen were measured bilaterally at two points located 3 cm above and 2 cm below the umbilicus, and at 3 different stages: before any muscle release; after release and undermining of the right RAM and left EOM; and after release and undermining of the left RAM and right EOM. Comparisons of tensile forces were conducted separately for the different muscles involved, layers of the rectus sheath, measurement points, and stages of separation. RESULTS: Tension on the abdominal midline after the release and undermining of both the RAM and EOM was reduced by 56% (p <0.05), 42% after the release and undermining of the EOM alone (p <0.05), and 35% after release and undermining of the RAM alone (p <0.05). CONCLUSION: Release and undermining of the EOM by CS led to lower tension on the abdominal midline compared to that associated with the release of the RAM alone.

Abdominal Wall Thickness Predicts Surgical Site Infection in Emergency Colon Operations.

BACKGROUND: Body mass index (BMI) does not reliably predict Surgical site infections (SSI). We hypothesize that abdominal wall thickness (AWT) would serve as a better predictor of SSI for patients undergoing emergency colon operations. METHODS: We retrospectively evaluated our Emergency Surgery Database (2007-2018). Emergency colon operations for any indication were included. AWT was measured by pre-operative CT scans at 5 locations. Only superficial and deep SSIs were considered as SSI in the analysis. Univariate then multivariable analyses were used to determine predictors of SSI. RESULTS: 236 patients met inclusion criteria. The incidence of post-operative SSI was 25.8% and the median BMI was 25.8kg/m2 [22.5-30.1]. The median AWT between patients with and without SSI was significantly different (2.1cm [1.4, 2.8] and 1.8cm [1.2, 2.5], respectively). A higher BMI trended toward increased rates of SSI, but this was not statistically significant. In overweight (BMI 25-29.9kg/m2) and obese (BMI ≥30kg/m2) patients, SSI versus no SSI rates were (50.0% versus 41.9% and 47.4% versus 36.4%, P = 0.365 and 0.230) respectively. The incidence of SSI in patients with an average AWT < 1.8cm was 20% and 30% for patients with average AWT ≥1.8cm. On multivariable analysis, AWT ≥1.8cm at 2cm inferior to umbilicus was an independent predictor of SSI (OR 2.98, 95%CI 1.34-6.63, P = 0.007). CONCLUSIONS: AWT is a better predictor of SSI than BMI. Preoperative imaging of AWT may direct intraoperative decisions regarding wound management. Future clinical outcomes research in emergency surgery should include abdominal wall thickness as an important patient variable.

Combined caudal retrocostal and lateral ultrasound-guided approach for transversus abdominis plane injection: A descriptive pilot study in pig cadavers.

Transversus abdominis plane (TAP) block is a regional anesthetic technique used to desensitize the abdominal wall in several species. This study aimed to describe the anatomical characteristics of the abdominal wall and to identify a feasible approach for an US-guided TAP injection that would result in adequate staining of the relevant nerves in the abdominal wall in pig cadavers. Fresh cadavers from five Landrace pigs (age, 12 weeks; body weight, 35.5 ± 1.6 kg) were used. One pig (n = 1) was anatomically dissected, and four pigs (n = 4; i.e., 8 hemiabdomens) were used for TAP injections and evaluation of dye spread. The volume of 0.3 mL/kg/injection point of methylene blue was injected bilaterally. In the caudal retrocostal approach, the injection was performed ventral to the most caudal part of the costal arch. In the lateral approach, the injection was performed between the last rib and iliac crest. A needle was inserted in plane for the caudal retrocostal and the lateral approach caudocranially and craniocaudally, respectively. Successful staining was defined as presence of dye on the nerve for a length of >1 cm in its entire circumference. The TAP was found between different muscle layers in the described anatomical regions. In the caudal retrocostal approach the TAP was found between the external abdominal oblique and transversus abdominis muscle bellies. In the lateral approach the TAP was found between the internal abdominal oblique and transversus abdominis muscles. The approach combining lateral and caudal retrocostal injections at the studied volume stained a median of 5 (3-6) target nerves from the fourth-last thoracic nerve to L2 (six nerves). Combined caudal retrocostal and lateral TAP injections of 0.3 mL/kg/injection point, resulted in staining of target nerve branches which supply the periumbilical and caudal abdominal wall in pig cadavers.

Correlations of the rectus abdominis muscle anatomy with anthropometric measurements.

PURPOSE: The anterior abdominal muscle wall has a strong aesthetic connotation, primarily because of the classical anatomical description of the rectus abdominis muscle in the collective consciousness. However, the morphological reality of the general population considerably deviates from this description. Therefore, we investigated the anthropometric characteristics correlated with the anatomy of the rectus abdominis muscle. METHODS: We performed a computed tomography scan anatomical study of recti abdominis muscles in 86 patients with no history of abdominal surgery. We noted the transverse and anteroposterior measurements of the rectus abdominis muscle, the transverse measurement of the linea alba, and the cutaneous and muscular abdominal perimeters. We compared these morphological elements with anthropometric data (sex, age, weight, height, and body mass index [BMI]). RESULTS: BMI was positively correlated with cutaneous abdominal perimeter (r = 0.89, p < 0.001) and muscular abdominal perimeter (r = 0.7, p < 0.001). The correlation of BMI with cutaneous abdominal perimeter was not influenced by sex (r = 0.90 and r = 0.89 in men and women, respectively). The correlation of BMI with muscular abdominal perimeter was greater in men than in women (r = 0.80 vs. r = 0.75). The muscular abdominal perimeter was more strongly correlated with the transverse measurement of the rectus abdominis muscle in men than in women (r = 0.75 vs. r = 0.59). The muscular abdominal perimeter was more strongly correlated with the linea alba in women than in men (r = 0.51 vs. r = 0.31). CONCLUSION: The anatomy of the anterior abdominal wall correlated with anthropometric data, including BMI. Rectus abdominis muscles and linea alba structures differed between men and women.

The fibers of the circular junction of the linea alba in normal adult anatomy.

The linea alba (LA) is known to be useful to surgeons for making surgical incisions. Laparoscopic entry into the peritoneal cavity using the open technique may involve identification of a point just above or below the umbilicus where the peritoneum is fused to the LA. This anatomical site is found through superficial dissection to expose the junction between the umbilical stalk (US) and the LA, where distinct fibers seem to form a unique ligament-like structure in normal adult anatomy. This point, in fact, is part of a circular fibrous structure that exists almost like a ring around the remnant US. It is formed by the fusion of oblique and transverse fibers of the LA with circular fibers from proliferation of an encircling band of compact mesoderm to close a patent umbilical ring. We describe and name this anatomical landmark as junctio circularis alba or the "circular junction of the LA" as encountered in normal adult human anatomy. We believe this is crucial for describing key surgical procedures at this site to aid effective surgical training and reduce iatrogenic complications from laparoscopic port site entries.

Ultrasonographic evaluation of the width, thickness, and length of the normal linea alba in standing and dorsal recumbent horses.

OBJECTIVE: To determine the variability in length, width, and thickness of the equine linea alba (LA) and the effect of a standing vs dorsal recumbent position on these measurements. STUDY DESIGN: Descriptive anatomical comparative study. ANIMALS: Standing horses (N = 75; in 30 horses, measurements were obtained in dorsal recumbency first and repeated after horses were standing). METHODS: Linea alba length was measured in standing position from xiphoid to umbilicus, and transverse ultrasonographic images were obtained at five reference points to measure LA width and thickness. In 30 horses, measurements were obtained in dorsal recumbency first and repeated after horses were standing. RESULTS: There was wide variation in LA width and thickness between standing horses, with gradual increase from xiphoid (range, 0.14-0.64 cm) to umbilicus (range, 0.2-2.97 cm). Linea alba length in standing position was 51.09 ± 6.219 cm. Width was independent of the size of the horse; thickness and length were correlated at some reference points to height (r = 0.346-585, P < .05) and weight (r = 0.324-0.642, P < .05). Different LA shapes could be identified. In dorsal recumbency, the LA was smaller in width at all reference points (15%-23%, P < .05) and shorter (20%, P < .001) compared with standing. CONCLUSION: In addition to the wide variability in LA measurements and shapes between horses, there was a significant decrease in LA width and length when horses changed from standing to dorsal recumbency. CLINICAL SIGNIFICANCE: The difference in LA length and width between dorsal recumbency and when standing could increase tension on sutures after laparotomy and should be taken into account when surgeons are closing the abdomen.

[Minimally invasive correction of anatomical features of anterior abdominal wall and ventral hernias]. / Miniinvazivnye metodiki v korrektsii anatomicheskikh osobennostei perednei bryushnoi stenki i v lechenii ventral'nykh gryzh.

Conventional «open¼ procedures for ventral hernias and diastasis recti are widely known, used everywhere and have a great number of author's improvements related to surgeon's experience, availability of modern information, equipment and materials. K. LeBlanc and W. Booth (1993) reported IPOM-method with non-adhesive coating that is considered a milestone in surgery of anterior abdominal wall and ventral hernia. This technique has gained recognition among surgeons around the world due to its technical simplicity, minimal invasiveness and high reproducibility. However, certain disadvantages of this technique have been shown over the past time that justified advisability of searching for another methods of anterior abdominal wall reinforcement. Thus, E-Milos, LIRA, TESAR, eTEP, REPA, TARM, TARUP techniques are currently available. This review is devoted to technical features of these techniques, their potential advantages and disadvantages.

Three-dimensional visualization and measurement of myopectineal orifice in non-inguinal hernia patients.

PURPOSE: The myopectineal orifice (MPO) is a weak area at lower part of the anterior abdominal wall that directly determines the mesh size required in inguinal hernia repair. However, MPO data have mainly been acquired from measurements of cadavers or anesthetized patients. Furthermore, there are very few reports on the measurement of the MPO in Chinese patients. The present study aimed to use three-dimensional visualization technology to measure the MPO in live non-anesthetized Chinese patients, and to use this information to indicate the appropriate mesh size required for inguinal hernia repair. METHODS: In this study, we used the parameters of the MPO and the pelvis that were measured in 40 patients with peripheral arterial disease of the lower limb arteries (80 inguinal regions) using Medraw software (Image Medraw Technology Co., Ltd., China). RESULTS: The result showed that the average width and height of the MPO were 5.71 ± 0.99 cm and 4.96 ± 0.69 cm, respectively (5.22 ± 0.77 cm and 5.13 ± 0.63 cm in males, and 6.20 ± 0.95 cm and 4.80 ± 0.71 cm in females). The average projected area of the MPO was 16.06 ± 4.37 cm2 on the left, and 15.61 ± 4.10 cm2 on the right (P > 0.05). CONCLUSION: Three-dimensional visualization was used to measure the area, width, and height of the MPO in living non-anesthetized Chinese patients. MPO area was correlated with age, but not with pelvic parameters.

Abdominal wall sonography: a pictorial review.

The anterior abdominal wall, which is composed of three layers (skin and adipose tissues; the myofascial layer; and the deep layer, consisting of the transversalis fascia, preperitoneal fat, and the parietal peritoneum), has many functions: containment, support and protection for the intraperitoneal contents, and involvement in movement and breathing. While hernias are often encountered and well reviewed in the literature, the other abdominal wall pathologies are less commonly described. In this pictorial review, we briefly discuss the normal anatomy of the anterior abdominal wall, describe the normal ultrasonographic anatomy, and present a wide range of pathologic abnormalities beyond hernias. Sonography emerges as the diagnostic imaging of first choice for assessing abdominal wall disorders, thus representing a valuable tool for ensuring appropriate management and limiting functional impairment.

Abdominal wall morphometric variability based on computed tomography: Influence of age, gender, and body mass index.

INTRODUCTION: Ventral hernia surgery does not usually account for the individuality of the abdominal wall anatomy. This could be both because medical imaging is rarely performed before surgery and because data on abdominal wall variability are limited. The objective of the present study was to perform an exhaustive morphometric analysis of abdominal wall components based on computed tomography (CT) scans. MATERIALS AND METHODS: A retrospective study was performed on 120 abdominopelvic CT scans of clinically normal adults aged 18-86 years equally divided between women and men and into four age groups. Each abdominal wall muscle was evaluated in terms of area, thickness, shape ratio, fat infiltration, and aponeuroses width. The influence of age, gender, and body mass index (BMI) was investigated, as well as muscular asymmetry. RESULTS: The abdominal wall muscle area represented 8.5 ± 2.5% of the abdominal area. The internal oblique muscle had the largest area, the rectus abdominis was the thickest, the transversus abdominis was the narrowest and had the smallest area. The width of the linea alba was 20.3 ± 12.0 mm. The evolution of the abdominal wall with age was quantified, as well as the large differences between the sexes and BMI groups, resulting in strong correlations and highlighting the specific pattern of the transversus abdominis. The asymmetry of the left and right muscle areas oscillated around 17%. CONCLUSIONS: The various components of the abdominal wall have been precisely described. Knowledge of their variability could be used to enhance the planning of ventral hernia surgery or to develop numerical modeling of the abdominal wall.

Relationship between rectal abdominis muscle position and physiological umbilical herniation and return: A morphological and morphometric study.

The herniation of the intestinal loop (IL) in the extraembryonic coelom and its return to abdominal cavity is in parallel with the formation of the rectal abdominis muscle (RAM). Using high-resolution magnetic resonance imaging data of human fetuses (n = 19, CRL22-69 mm; stored at Kyoto Collection), this study aimed to analyze the relationship between the development of RAM and phase of IL herniation. The RAM runs at the lateral part of the abdominal wall in the small samples in the herniation phase. The position was shifted to the midline area in the larger samples in the herniation phase. According to fetal growth, the caudal ends of the muscles extended along the umbilical ring towards the pubis, though the caudal part of the RAMs were thin and faint in most of the samples. Length measurements related with the growth of the abdominal wall including RAM and abdominal circumference showed positive correlation with fetal growth. On the contrary, diastasis of RAMs and the width and area of the umbilical ring were almost constant according to fetal growth. Such morphometric value showed no obvious changes regardless of the phases of herniation. The ratio of the width and diastasis of the RAMs to the circumference was decreased, indicating that the closure of the ventral body wall was influenced by growth differences. The present data indicate that the formation of the abdominal wall including RAM is independent of the phase of IL herniation, whether in the extraembryonic coelom or in the abdominal cavity.

Original concepts in anatomy, abdominal-wall surgery, and component separation technique and strategy.

BACKGROUND: The abdominal wall can be considered comprised of two compartments: an anterior and a posterior compartment. The anterior compartment includes the anterior rectus sheath and the rectus muscle. The posterior compartment comprises the posterior rectus sheath, the transversalis fascia, and the peritoneum. When a large defect in the anterior compartment has to be corrected, for example, a rectus diastasis or large incisional hernia, an action on the anterior compartment is necessary; therefore, an anterior component separation has to be considered. If a loss of substance is present in the posterior compartment, a trasversus abdominis release should be accomplished. METHODS: We propose an original anterior compartment mobilisation, by a posterior approach. Dissection of the posterior rectus sheet proceeds until the linea semilunaris is reached. Incision of the anterior rectus sheath permits a mobilisation of the anterior compartment by a posterior approach. A mesh is placed in a sublay position. If the abdominal wall presents a loss of substance of the posterior compartment, a transversus abdominis release (TAR) can be performed in the same time. RESULTS: No hernia recurrences, no wound infection, and no mesh infection have been reported. CONCLUSIONS: The anterior compartment mobilization permits mobilization towards the midline of rectus muscle and restoration of anterior compartment, with low morbidity rate; it can be easily associated to a large sublay mesh placement, it allows the preservation of the neurovascular bundles and rectus muscle trophism, and it can be associated with a concomitant TAR procedure for the restoration of the PC, if necessary.

Evaluation of a workshop to teach a new surgical technique in abdominal wall reconstruction.

PURPOSE: Assess the utility of a hands-on workshop on abdominal wall reconstruction for teaching the posterior components separation (PCS) with transversus abdominis release. METHODS: Our department has been organizing a training course on abdominal wall reconstruction for the last 6 years. It is a 2-day-long course and 10-12 surgeons with experience in abdominal wall surgery attend to every course. The first day is dedicated to theoretical lectures and two simultaneous live surgeries, and the second day there is a cadaver dissection. Feedback from the trainees was collected at the end of the workshop. A survey was sent to all the surgeons who had completed the course at least a year ago, to inquire how the course had improved their surgical practice. RESULTS: From 2013 to April 2017, we have made 15 editions of the course. A total of 192 surgeons from Europe, South Africa and Middle East attended. All the surgeons answered the survey that was carried out at the end of the course. It showed a very high level of satisfaction in more than 98% of the cases. The second survey was answered by 79 surgeons (41.15%). 96% of the surgeons had modified, after attending the course, their way of dealing with complex abdominal wall problems. Only 29% of the surgeons had made a TAR before attending the course, while 86% are performing it after attending the course and 60% do it on a regular basis. In fact, 43% of surgeons have performed more than five posterior component separations in the last year. CONCLUSIONS: A workshop of abdominal wall surgery that combines live surgery, theoretical content and a cadaver lab can be a very useful tool to expand the use of new surgical techniques.