Faculty Bibliography

OBJECTIVE:To correlate patient and surgeon specific factors with outcomes after operative management of distal intra-articular tibia fractures. DESIGN/METHODS:Retrospective cohort study. SETTING/METHODS:Three Level 1 tertiary academic trauma centers. PATIENTS/PARTICIPANTS/METHODS:A consecutive series of 175 patients with OTA/AO 43-C pilon fractures. MAIN OUTCOME MEASUREMENTS/METHODS:Primary outcomes include superficial and deep infection. Secondary outcomes include nonunion, loss of articular reduction, and implant removal. RESULTS:The following patient specific factors correlated with poor surgical outcomes: increased age with superficial infection rate (p<0.05), smoking with rate of nonunion (p<0.05), and Charlson Comorbidity Index with loss of articular reduction(p<0.05). Each additional 10 minutes of operative time over 120 minutes was associated with increased odds of requiring I&D and any treatment for infection. The same linear effect was seen with addition of each fibular plate. The number of approaches, type of approach, use of bone graft, and staging were not associated with infection outcomes. Each additional 10 minutes of operative time over 120 minutes was associated with increased rate of implant removal, as did fibular plating. CONCLUSIONS:While many of the patient-specific factors that negatively impact surgical outcomes for pilon fractures may not be modifiable, surgeon-specific factors need to be carefully examined as these may be addressed. Pilon fracture fixation has evolved to increasingly utilize fragment specific approaches applied with a staged approach. Although the number and type of approaches did not affect outcomes, longer operative time was associated with increased odds of infection while additional fibular plate fixation, was associated with higher odds of both infection and implant removal. Potential benefits of additional fixation should be weighed against operative time and associated risk of complications. LEVEL OF EVIDENCE/METHODS:Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

CASE/METHODS:Given the rare incidence of sternal nonunion after traumatic injury, literature describing the management of posttraumatic sternal reconstruction is limited. We present a case of a 54-year-old man with a history of traumatic chest wall injury with multiple unsuccessful attempts at sternal repair who presented with chronic sternal nonunion and persistent bone defect. Sternal reconstruction using a vascularized double-barrel free fibula flap with rigid fixation in multiple planes was performed, with confirmed bony union at 6 months. CONCLUSION/CONCLUSIONS:This novel approach to sternal nonunion management allowed effective bridging of posttraumatic sternal bone defects while facilitating osseous integration and long-term stabilization.

BACKGROUND:The incidence of transgender adolescents seeking gender affirming surgery (GAS) in increasing. Surgical care of the adolescent transgender patient is associated with several unique technical, legal, and ethical factors. The authors present a review of the current literature on gender affirming surgery for individuals under the age of legal majority and propose directions for future research. METHODS:A scoping review of recent literature was performed to assess evidence on gender affirming surgery in individuals under the age of legal majority. Papers were included that examined either ethical or technical factors unique to pediatric GAS. Study characteristics and conclusions were analyzed in conjunction with expert opinion. RESULTS:Twelve papers were identified meeting inclusion criteria. Ten of these papers discussed ethical challenges in adolescent GAS, seven papers discussed legal challenges, and five papers discussed technical challenges. Ethical discussions focused on the principles of beneficence, nonmaleficence, and autonomy. Legal discussions centered on informed consent and insurance coverage. Technical discussions focused on the impact of puberty blockade on natal tissue. CONCLUSIONS:Surgical care of the adolescent transgender patient involves important ethical, legal, and technical considerations that must be addressed by the clinical team. As the population of individuals seeking GAS after puberty blockade increases, future research is needed describing functional and psychosocial outcomes in these individuals.

Bone tissue regeneration is a complex process that proceeds along the well-established wound healing pathway of hemostasis, inflammation, proliferation, and remodeling. Recently, tissue engineering efforts have focused on the application of biological and technological principles for the development of soft and hard tissue substitutes. Aim is directed towards boosting pathways of the healing process to restore form and function of tissue deficits. Continued development of synthetic scaffolds, cell therapies, and signaling biomolecules seeks to minimize the need for autografting. Despite being the current gold standard treatment, it is limited by donor sites' size and shape, as well as donor site morbidity. Since the advent of computer-aided design/computer-aided manufacturing (CAD/CAM) and additive manufacturing (AM) techniques (3D printing), bioengineering has expanded markedly while continuing to present innovative approaches to oral and craniofacial skeletal reconstruction. Prime examples include customizable, high-strength, load bearing, bioactive ceramic scaffolds. Porous macro- and micro-architecture along with the surface topography of 3D printed scaffolds favors osteoconduction and vascular in-growth, as well as the incorporation of stem and/or other osteoprogenitor cells and growth factors. This includes platelet concentrates (PCs), bone morphogenetic proteins (BMPs), and some pharmacological agents, such as dipyridamole (DIPY), an adenosine A 2A receptor indirect agonist that enhances osteogenic and osteoinductive capacity, thus improving bone formation. This two-part review commences by presenting current biological and engineering principles of bone regeneration utilized to produce 3D-printed ceramic scaffolds with the goal to create a viable alternative to autografts for craniofacial skeleton reconstruction. Part II comprehensively examines recent preclinical data to elucidate the potential clinical translation of such 3D-printed ceramic scaffolds.

OBJECTIVE:To 1) describe the authors' experience with surgical management of complications following intestinal vaginoplasty and 2) review the literature on incidence of complications following gender affirming intestinal vaginoplasty. METHODS:Retrospective chart review identified patients presenting with complications following prior intestinal vaginoplasty requiring operative management. Charts were analyzed for medical history, preoperative exam and imaging, intraoperative technique, and long-term outcomes. Systematic literature review was performed to identify primary research on complications following gender affirming intestinal vaginoplasty. RESULTS:Four patients presented to the senior authors' clinic requiring operative intervention for complications following intestinal vaginoplasty, all of whom underwent surgical revision. Complications included vaginal stenosis (2 patients, 50%), vaginal false passage (1 patient, 25%) and diversion colitis (1 patient, 25%). Postoperatively all patients were able to dilate successfully to a depth of at least 15cm. Systematic review identified 10 studies meeting inclusion criteria. There were 215 complications reported across 654 vaginoplasties (33% overall complication rate). Average return to OR rate was 18%. The most common complications were stenosis (11%), mucorrhea (7%), vaginal prolapse (6%), and malodor (5%). Six intestinal vaginoplasty segments developed vascular compromise leading to flap loss. There were 2 reported mortalities. CONCLUSIONS:Intestinal vaginoplasty is associated with a range of complications including vaginal stenosis, mucorrhea, and vaginal prolapse. Intra-abdominal complications, including diversion colitis, anastomotic bowel leak, and intra-abdominal abscess can occur many years after surgery, be life-threatening and require prompt diagnosis and management.

BACKGROUND/UNASSIGNED:Despite evidence documenting the physical and psychological benefits of breast reduction, third-party payer approval remains a cumbersome process. The objective of this study was to assess differences in medical necessity criteria for reduction mammaplasty among US insurance carriers while analyzing trends in claim denials and appeals. METHODS/UNASSIGNED:The medical necessity criteria for reduction mammaplasty were retrieved from seven large health insurance carriers. Data were extracted from each policy, including claim requirements for approval. Additionally, prospective data on claims and denials submitted from January through August 2022 were collected from The Auctus Group, a medical consulting firm. RESULTS/UNASSIGNED:All the policies have been updated since January 2020. Five of the seven policies specifically listed what documentation was required for preauthorization approval, with five third-party payers requiring photograph documentation. Policies required documentation of one to three symptoms lasting from 6 weeks to 1 year. All companies reported a tissue resection estimate threshold, but cutoffs varied. Of 380 reduction mammaplasties performed, 158 (41.6%) received a denial on initial insurance submission. Considering appeals, a total of 216 denials were reviewed with an average of 1.37 denials per patient. Of the 158 initial denials, 104 (65.8%) of these were from claims that received preauthorization. In 12 cases, third-party payers stated that no prior authorization was necessary yet still denied the claim. CONCLUSIONS/UNASSIGNED:Wide variability exists in medical necessity criteria for reduction mammaplasty policies among major insurance carriers. These nuances introduce inefficiencies for practices contributing to high denial and appeal rates while delaying surgical care for patients.

Hydrogels with long-term storage stability, controllable sustained-release properties, and biocompatibility have been garnering attention as carriers for drug/growth factor delivery in tissue engineering applications. Chitosan (CS)/Graphene Oxide (GO)/Hydroxyethyl cellulose (HEC)/β-glycerol phosphate (β-GP) hydrogel is capable of forming a 3D gel network at physiological temperature (37 °C), rendering it an excellent candidate for use as an injectable biomaterial. This work focused on an injectable thermo-responsive CS/GO/HEC/β-GP hydrogel, which was designed to deliver Atsttrin, an engineered derivative of a known chondrogenic and anti-inflammatory growth factor-like molecule progranulin. The combination of the CS/GO/HEC/β-GP hydrogel and Atsttrin provides a unique biochemical and biomechanical environment to enhance fracture healing. CS/GO/HEC/β-GP hydrogels with increased amounts of GO exhibited rapid sol-gel transition, higher viscosity, and sustained release of Atsttrin. In addition, these hydrogels exhibited a porous interconnected structure. The combination of Atsttrin and hydrogel successfully promoted chondrogenesis and osteogenesis of bone marrow mesenchymal stem cells (bmMSCs) in vitro. Furthermore, the work also presented in vivo evidence that injection of Atsttrin-loaded CS/GO/HEC/β-GP hydrogel stimulated diabetic fracture healing by simultaneously inhibiting inflammatory and stimulating cartilage regeneration and endochondral bone formation signaling pathways. Collectively, the developed injectable thermo-responsive CS/GO/HEC/βG-P hydrogel yielded to be minimally invasive, as well as capable of prolonged and sustained delivery of Atsttrin, for therapeutic application in impaired fracture healing, particularly diabetic fracture healing.

Skeletal stem and progenitor cells (SSPCs) perform bone maintenance and repair. With age, they produce fewer osteoblasts and more adipocytes leading to a loss of skeletal integrity. The molecular mechanisms that underlie this detrimental transformation are largely unknown. Single-cell RNA sequencing revealed that Notch signaling becomes elevated in SSPCs during aging. To examine the role of increased Notch activity, we deleted Nicastrin, an essential Notch pathway component, in SSPCs in vivo. Middle-aged conditional knockout mice displayed elevated SSPC osteo-lineage gene expression, increased trabecular bone mass, reduced bone marrow adiposity, and enhanced bone repair. Thus, Notch regulates SSPC cell fate decisions, and moderating Notch signaling ameliorates the skeletal aging phenotype, increasing bone mass even beyond that of young mice. Finally, we identified the transcription factor Ebf3 as a downstream mediator of Notch signaling in SSPCs that is dysregulated with aging, highlighting it as a promising therapeutic target to rejuvenate the aged skeleton.

BACKGROUND/UNASSIGNED:The purpose of this study was to evaluate the association between timing of nerve repair and the ability to perform a primary nerve repair versus a bridge repair requiring the use of allograft, autograft, or a conduit in lacerated upper extremity peripheral nerve injuries. METHODS/UNASSIGNED:This is a retrospective case-control study of patients who underwent upper extremity nerve repair for lacerated peripheral nerves identified by Current Procedural Terminology codes. Timing of injury and surgery, as well as other information such as demographic information, mechanism of injury, site of injury, and type of nerve repair, was recorded. The odds of a patient requiring bridge repair based on the duration of time between injury and surgery was evaluated using logistic regression. RESULTS/UNASSIGNED:A total of 403 nerves in 335 patients (mean age 35.87 ± 15.33 years) were included. In all, 241 nerves were primarily repaired and 162 required bridge repair. Patients requiring bridge repair had a greater duration between injury and surgery compared with patients who underwent primary repair. Furthermore, the nerves requiring bridge repair were associated with a greater gap compared with the nerves repaired primarily. Based on logistic regression, each 1-day increase in duration between injury and surgery was associated with a 3% increase in the odds of requiring bridge repair. CONCLUSIONS/UNASSIGNED:There is no defined critical window to achieve a primary nerve repair following injury. This study demonstrated that nerve injuries requiring bridge repair were associated with a significantly greater delay to surgery.