Wan, Rou

Background: The authors present a novel microsurgical model to investigate ischemia-reperfusion (I/R) injury in composite tissue (muscle/skin) using a musculocutaneous flap. I/R was induced in a rodent biceps femoris musculocutaneous flap through collateral ligation and arteriovenous clamping. The authors hypothesized that I/R flaps would show greater tissue damage compared with sham. Methods: Male rats were randomized into I/R ( n = 10) and sham ( n = 9) groups. The I/R group underwent flap elevation, collateral ligation, 3 hours of arteriovenous clamping, followed by reperfusion. The sham group had flap elevation only. Perfusion was monitored using laser-speckle imaging, and flap discoloration was assessed with blinded skin ischemia necrosis scores. Serum and the composite tissue (skin/muscle) were analyzed for injury on postoperative days (PODs) 1 or 3. Results: Clamping reduced perfusion ( P = 0.00), whereas unclamping increased perfusion ( P <0.00). Over time, flaps exposed to I/R were more ischemic (estimate, 0.39; P = 0.02). At POD1, the injury group had higher serum creatine kinase ( P = 0.04) and potassium ( P = 0.00) than the sham group. The injury group had more muscle apoptosis (34.7% versus 5.2%; P = 0.03), myonecrosis (30.3% versus 14.1%; P = 0.04), and inflammation (13.7% versus 4.9%; P = 0.02) than the sham group; myonecrosis and inflammation persisted into POD3. Skin apoptosis and inflammation were similar. Conclusions: This model reliably reproduces I/R injury with a 3-hour ischemic period followed by early reperfusion. Animals subjected to the authors’ technique showed greater tissue damage than the sham group, with muscle being more vulnerable than skin. Serum showed peak muscle injury at 24 hours, and histologic analysis showed myonecrosis and inflammation through 72 hours. This suggests that less than 24 hours’ reperfusion (eg, critical window) may serve as the optimal time for possible intervention. Clinical Relevance Statement: I/R injury is a complex phenomenon affecting vascular composite tissues. The mitochondrial superoxide dismutase may be more specific for I/R injury. There may be a critical window within which to mitigate injury (<24 hours after reperfusion). The authors’ model helps investigate muscle/skin I/R injury.

Background: Skin cancer patients who undergo Mohs surgery may require subsequent reconstructive rhinoplasty for large nasal defects. Autologous cartilage is the primary source of supporting cartilage grafts, but carries the risk of potential donor-site complications. In this study, we demonstrate the safety and efficacy of nonterminally irradiated fresh frozen human costal cartilage allografts (CCAs) in reconstructive rhinoplasty after skin cancer removal. Methods: A retrospective chart review of 25 patients who underwent reconstructive rhinoplasties using human CCA after basal cell carcinoma resection was conducted. Human CCA undergoes a process of sterilization without terminal irradiation and is stored frozen (−40°C to −80°C). Anthropometric measurements were taken on pre- and postoperative photographs to evaluate nasal tip projection. Adverse events were evaluated. Results: There were 25 participants, with an average age of 71 years at the time of surgery (range: 42–90). The average follow-up duration was 12 months (range: 3–66 mo). Types of grafts used included alar batten graft (n = 17, 68%), nasal tip graft (n = 7, 28%), and alar batten graft with nasal tip graft (n = 1, 4%). Measurements on the 2-dimensional photographs of the patients showed no significant resorption or deviation at the 6- or 12-month follow-up. No significant complications related to the use of the cartilage were noted. Conclusions: Our data highlight the low complication rate and aesthetically positive outcomes from using nonterminally irradiated human CCA for reconstructive rhinoplasties in post-Mohs surgery for older patients. This approach offers a reliable source of high-quality cartilage for reconstruction.

ABSTRACT Long segment losses exceeding 10 cm in the sciatic nerve are challenging in both the reconstructive techniques and optimizing sensory and motor function recovery. This case report and literature review describes our experience of using a pedicled vascularized common peroneal nerve graft to repair a 14‐cm sciatic nerve defect, involving L4 , L5 , and S1 nerve roots. Additionally, we conducted a literature review of various types of nerve autografts for large sciatic nerve defects, summarizing their characteristics and outcomes to aid clinicians in decision‐making and expected results in different scenarios. The patient, a 23‐year‐old female diagnosed with neurofibromatosis type I, underwent R0 tumor resection of the proximal left sciatic nerve due to a malignant peripheral nerve sheath tumor. She received an ipsilateral pedicled vascularized common peroneal nerve graft. The reconstruction included the L4 , L5 , and S1 nerve roots beyond the greater sciatic foramen into the inner pelvis. The patient's postoperative course was uneventful. At the 26‐month follow‐up, she showed MRC grade 4/5 strength in hamstrings with 90°knee flexion and a steady gait pattern. At the 32‐month follow‐up, she could ambulate very well with an ankle‐foot orthosis. The outcomes support the use of a pedicled vascularized common peroneal nerve graft in a single‐staged surgery to restore motor function for large sciatic nerve defects. Our literature review revealed that in cases where sural nerves are insufficient or injured for sciatic nerve reconstruction, the common peroneal nerve is a viable alternative to help patients regain functional independence.

Abstract This historical narrative presents a comprehensive historical journey delving into the diverse facets of gender identity and expression across ancient cultures. It explores these civilizations' perspectives on gender diversity, highlighting instances that challenged conventional gender norms. Transitioning to the modern era, the narrative examines the dynamic landscape of LGBTQ+ and trans movements, spotlighting influential figures whose advocacy has significantly influenced societal perceptions and advanced the rights of gender diverse individuals. Their contributions continue to shape contemporary affirming care practices. Exploring the emergence of gender-affirming surgery, the narrative highlights pioneering surgeons and original techniques employed in these transformative procedures. It shows the courage and innovation of early surgeons who laid the groundwork for contemporary practices. At the core of this historical narrative lies the pivotal role of plastic surgeons in gender-affirming care. It emphasizes the significance of a collaborative multidisciplinary approach among medical professionals to ensure comprehensive and patient-centered care for transgender individuals seeking affirming interventions. However, intertwined with this narrative are legislative barriers that have hindered progress in gender-affirming care. The narrative navigates these obstacles, highlighting their complexities and emphasizing the urgent need for sustained medical advocacy and legislative reforms to foster an inclusive healthcare landscape. Ultimately, this narrative stands as a testament to the ongoing struggle and resilience within the realm of gender-affirming care, shedding light on its profound impact on individuals' lives, emphasizing the ongoing need for compassionate, comprehensive, and inclusive healthcare practices.

Abstract: In knee arthroscopy procedures, maintaining the opening of the medial compartment requires an assistant. Creating the posterior portal in knee arthroscopy is also a challenge because of the shape changes of the thick muscle. The leg is usually placed on the surgical bed, is angled off the lateral aspect of the bed, or drapes over the surgical bed in which the leg plates are removed. However, the aforementioned positions have some limits because of surgical convenience and procedural stability. In this Technical Note, we propose an approach to improve the existing knee positions using a metal round stool as a foot support. The method aims to reduce reliance on human assistants during knee arthroscopy procedures and restore the natural positioning of leg muscles, potentially improving procedural outcomes. Technique Video video See video under supplementary data.

ABSTRACT Introduction Acute Compartment Syndrome (ACS) is a severe trauma caused by elevated intra-muscle-compartment pressure (ICP). The current standard method for diagnosis is to insert a needle into the muscle sterilely under anesthesia. However, to secure the environment is sometimes not easy and leads to delays in diagnosis. Recently, we have focused on shear wave ultrasound elastography (SWE) as an alternative, which can be done concisely in unclean environment and without anesthesia. We would like to report the usefulness of SWE for ACS diagnosis using 2-pedal walking turkey model recently developed in our lab. Materials and Methods A total of 32 1-year-old Bourbon turkeys were used. 5% solution of chicken albumin was infused continuously into the tibialis cranialis (TC) muscle using IV pump. The ICP was increased stepwise from 0 to 50 mmHg. During the rising of ICP, the correlation between values of SWE (kPa) and ICP (mmHg) was measured. After the ICP reached 50 mmHg, half of the turkeys were maintained at this pressure for 2 hours and the rest for 6 hours. After infusion, a fasciotomy was performed on the half turkey. Half of the turkeys were euthanized after 2 weeks and the rest after 6 weeks. SWE of TC muscle and walking gait data on turkeys using a portable walkway system were measured weekly until euthanasia. At euthanasia, isometric tetanic muscle force (ITF) tests to TC muscle and histological evaluations were performed. Results SWE value (kPa) was highly significantly correlated to the actual ICP (mmHg) (R2 = 0.91). Stance of ACS side leg were significantly extended, and swing of the control side shortened from the second to the third week after ACS in the 6 hours infusion-no-fasciotomy group (P &lt; 0.05*). ITF was significantly reduced mainly in the 6 hours infusion group (P &lt; 0.05*). Histological evaluation revealed that in the 6 hours infusion and 6 weeks survival group, both the muscle fiber and intercellular distances were significantly expanded (P &lt; 0.05). Conclusion SWE seems to be a substitute measure of ICP in diagnosing ACS. With regard to our in vivo ACS model using turkey, survival at 50 mmHg ICP for 6 hours and 6 weeks post ACS would be an appropriate situation.

There is extensive coverage in the existing literature on implant-associated lymphomas like anaplastic large-cell lymphoma, but breast implant-associated squamous cell carcinoma (BIA-SCC) has received limited scholarly attention since its first case in 1992. Thus, this study aims to conduct a qualitative synthesis focused on the underexplored association between breast implants and BIA-SCC. A systematic review was conducted utilizing the PubMed, Web of Science, and Cochrane databases to identify all currently reported cases of BIA-SCC. Additionally, a literature review was performed to identify potential biochemical mechanisms that could lead to BIA-SCC. Studies were vetted for quality using the NIH quality assessment tool. From an initial pool of 246 papers, 11 met the quality criteria for inclusion, examining a total of 14 patients aged between 40 and 81 years. BIA-SCC was found in a diverse range of implants, including those with smooth and textured surfaces, as well as those filled with saline and silicone. The condition notably manifested a proclivity for aggressive clinical progression, as evidenced by a mortality rate approximating 21.4% within a post-diagnostic interval of six months. Our literature review reveals that chronic inflammation, driven by various external factors such as pathogens and implants, can initiate carcinogenesis through epigenetic modifications and immune system alterations. This includes effects from exosomes and macrophage polarization, showcasing potential pathways for the pathogenesis of BIA-SCC. The study highlights the pressing need for further investigation into BIA-SCC, a subject hitherto inadequately addressed in the academic sphere. This necessitates the urgency for early screening and intervention to improve postoperative outcomes. While the review is confined by its reliance on case reports and series, it serves as a valuable reference for future research endeavors.

AbstractChordae tendineae, referred to as heart tendinous cords, act as tendons connecting the papillary muscles to the valves in the heart. Their role is analogous to tendons in the musculoskeletal system. Despite being exposed to millions of cyclic tensile stretches over a human's lifetime, chordae tendineae rarely suffer from overuse injuries. On the other hand, musculoskeletal tendinopathy is very common and remains challenging in clinical treatment. The objective of this study was to investigate the mechanism behind the remarkable durability and resistance to overuse injuries of chordae tendineae, as well as to explore their effects on flexor tenocyte biology. The messenger RNA expression profiles of chordae tendineae were analyzed using RNA sequencing and verified by quantitative reverse transcription polymerase chain reaction and immunohistochemistry. Interestingly, we found that periostin (Postn) and fibroblast growth factor 7 (FGF7) were expressed at significantly higher levels in chordae tendineae, compared to flexor tendons. We further treated flexor tenocytes in vitro with periostin and FGF7 to examine their effects on the proliferation, migration, apoptosis, and tendon‐related gene expression of flexor tenocytes. The results displayed enhanced cell proliferation ability at an early stage and an antiapoptotic effect on tenocytes, while treated with periostin and/or FGF7 proteins. Furthermore, there was a trend of promoted tenocyte migration capability. These findings indicated that Postn and FGF7 may represent novel cytokines to target flexor tendon healing. Clinical significance: The preliminary discovery leads to a novel idea for treating tendinopathy in the musculoskeletal system using specific molecules identified from chordae tendineae.

Paediatric trigger finger is rare compared to adult trigger finger or paediatric trigger thumb, and the aetiology is unclear. Proposed causes include local trauma, anatomical anomalies and systemic conditions. The aim of the present study was to detail the anatomical causes of surgically treated paediatric trigger fingers and provide an operative algorithm based on the anatomical findings. A total of 76 trigger fingers in 38 patients were identified retrospectively at our institution between 1975 and 2022. In total, 41 fingers in 26 patients had anatomical variations. A nodular thickening on the tendon, similar to Notta’s nodule in trigger thumbs, was the most common anatomical cause. Abnormal decussation of the flexor digitorum superficialis tendon was the second most common variation. The recurrence rate was significantly lower after resection of one slip of the flexor digitorum superficialis tendon compared to other surgical techniques in these patients. We recommend that surgeons assess for possible anatomical variation during surgery for the trigger finger. Level of evidence: IV