Frailty and outcomes after unilateral MRI-guided focused ultrasound thalamotomy for tremor.

OBJECTIVE: Frailty is recognized as an important predictor of neurointerventional outcomes. MRI-guided focused ultrasound (MRgFUS) thalamotomy is a treatment option for patients with refractory essential tremor (ET) and tremor-dominant Parkinson's disease (TdPD). The aim of this study was to evaluate whether frailer MRgFUS thalamotomy patients had worse tremor outcomes or more complications. METHODS: The authors performed a cohort analysis of patients treated with MRgFUS between 2020 and 2023. Inclusion criteria were unilateral MRgFUS thalamotomy for ET or TdPD with available follow-up data (minimum 3-month follow-up). Frailty was assessed using the 11-item modified frailty index (mFI-11), which includes 11 medical comorbidities. Tremor outcomes were assessed using the Clinical Rating Scale for Tremor Part B. Complications assessed included disturbances of sensation, speech and swallowing, balance and gait, and strength. RESULTS: In total, 169 eligible patients were identified, including 135 (79.9%) ET and 34 (20.1%) TdPD patients. Frailty did not result in significant differences in tremor outcomes in the combined (p = 0.833), ET (p = 0.902), or TdPD (p = 0.501) cohort, or in any adverse events at the last follow-up (all p > 0.05). The combined mean follow-up was 10.3 ± 5.8 months (range 3-24 months), with cohort-specific mean follow-ups of 10.8 ± 6.0 months for ET and 8.6 ± 4.6 months for TdPD. Between the ET and TdPD cohorts, no significant differences existed in age, sex, handedness, side treated, skull density ratio, number of sonications, peak and average temperatures, energy delivered, BMI, or American Society of Anesthesiologists classification. For medical comorbidities, only hypertension was significantly different (65.9% ET, 47.1% TdPD; p = 0.043). The ET patients were significantly frailer overall, with 20.7% ET and 35.3% TdPD patients considered robust (mFI-11 score of 0), 14.8% ET and 32.4% TdPD patients prefrail (mFI-11 score of 1), 25.9% ET and 8.8% TdPD patients frail (mFI-11 score of 2), and 38.5% ET and 23.5% TdPD patients severely frail (mFI-11 score ≥ 3) (p = 0.007). CONCLUSIONS: Increasing frailty is not associated with worse outcomes, suggesting that MRgFUS may be appropriate even for frailer patients. ET patients are frailer than TdPD patients selected for MRgFUS.

The Impact of L4-L5 Minimally Invasive Transforaminal Lumbar Interbody Fusion on 2-Year Adjacent-level Parameters.

OBJECTIVE: This study evaluates the impact of L4-L5 minimally invasive surgery (MIS)- transforaminal lumbar interbody fusion (TLIF) on adjacent-level parameters. METHODS: This is a retrospective study performed on consecutive patients between January 2015 and December 2019. The index- and adjacent-level segmental lordosis (SL) and disc angle (DA) were measured. Patient-reported outcomes (PROs) were collected preoperatively and at 3-24 months postoperatively. Factors influencing changes in adjacent-level parameters and the occurrence of adjacent segment degeneration (ASDeg) were assessed. RESULTS: A total of 117 adult patients, averaging 65.5 years of age and slight preponderance of female (56.4%), were analyzed. L4-L5 SL decreased at 2 years (P < 0.05), but L4-L5 DA significantly increased at all timepoints (P < 0.05). While L3-L4 SL and DA significantly decreased at all timepoints (P < 0.05), L5-S1 SL decreased at 3 and 12 months (P < 0.05) and L5-S1 DA only significantly decreased at 2 years (P < 0.05). All PROs improved significantly (P < 0.0001). The ASDeg rate was 19.7% at 2.2 years. Cephalad and caudal ASDeg rates were 12.0% and 10.3%, respectively. Eight patients (6.8%) required adjacent-level reoperations, mainly at L3-L4 (6 cases). The use of expandable cage significantly reduced the odds of caudal ASDeg (OR 0.15, P = 0.037), but had no significant effect on cephalad ASDeg. CONCLUSIONS: L4-L5 MIS-TLIF had a more consistent effect on L3-L4 than L5-S1. Although adjacent-level SL and DA decreased over time, their association with ASDeg appears limited, suggesting a multifactorial etiology. L4-L5 MIS-TLIF provides demonstrable clinical benefits with lasting PRO improvements and low adjacent-level reoperations.

Long-Term Outcomes of Surgery and Radiation Treatment for Adult Patients with Craniopharyngioma.

OBJECTIVE: Treatment of craniopharyngioma typically entails gross total resection (GTR) or subtotal resection with adjuvant radiation (STR-RT). We analyzed outcomes in adults with craniopharyngioma undergoing GTR versus STR-RT. METHODS: This retrospective study enrolled 115 patients with craniopharyngioma in 5 institutions. Patients with STR received postoperative RT with stereotactic radiosurgery or fractionated radiation therapy per institutional preference and ability to spare optic structures. RESULTS: Median age was 44 years (range, 19-79 years). GTR was performed in 34 patients and STR-RT was performed in 81 patients with median follow-up of 78.9 months (range, 1-268 months). For GTR, local control was 90.5% at 2 years, 87.2% at 3 years, and 71.9% at 5 years. For STR-RT, local control was 93.6% at 2 years, 90.3% at 3 years, and 88.4% at 5 years. At 5 years following resection, there was no difference in local control (P = 0.08). Differences in rates of visual deterioration or panhypopituitarism were not observed between GTR and STR-RT groups. There was no difference in local control in adamantinomatous and papillary craniopharyngioma regardless of treatment. Additionally, worse local control was found in patients receiving STR-RT who were underdosed with fractionated radiation therapy (P = 0.03) or stereotactic radiosurgery (P = 0.04). CONCLUSIONS: Good long-term control was achieved in adults with craniopharyngioma who underwent STR-RT or GTR with no significant difference in local control. First-line treatment for craniopharyngioma should continue to be maximal safe resection followed by RT as needed to balance optimal local control with long-term morbidity.

Postoperative Adjacent Segment Disease in Minimally Invasive Transforaminal Lumbar Interbody Fusion with Adjacent Laminectomy for Grade I-II Spondylolisthesis and Adjacent Spinal Stenosis.

BACKGROUND AND OBJECTIVES: Studies have demonstrated increased risk of adjacent segment disease (ASD) after open fusion with adjacent-level laminectomy, with rates ranging from 16%-47%, potentially related to disruption of the posterior ligamentous complex. Minimally invasive surgical (MIS) approaches may offer a more durable result. We report institutional outcomes of simultaneous MIS transforaminal lumbar interbody fusion (MISTLIF) and adjacent-level laminectomy for patients with low grade spondylolisthesis and ASD. METHODS: Retrospective analysis was performed on patients who underwent MISTLIF with adjacent level laminectomy to treat grade I-II spondylolisthesis with adjacent stenosis at a single institution from 2007-2022. RESULTS: A total of 34 patients met criteria, with mean follow-up of 23.1 months. In total, 37 levels were fused and 45 laminectomies performed. In this group, 21 patients received a single level laminectomy and single-level MISTLIF, 10 patients received a 2-level laminectomy and single-level MISTLIF, 2 patients received a single-level laminectomy and 2-level MISTLIF, and 1 patient received a 2-level laminectomy and 2-level MISTLIF. Three (8.8%) patients experienced clinically significant postoperative ASD requiring reoperation. Three other patients required reoperation for other reasons. Multiple logistic regression did not reveal any association between development of ASD and surgical covariates. CONCLUSION: MISTLIF with adjacent-level laminectomy demonstrated a favorable safety profile with rates of postoperative ASD lower than published rates after open fusion and on par with the published rates of ASD from MISTLIF alone. Future prospective studies may better elucidate the durability of adjacent-level laminectomies when performed alongside MISTLIF, but retrospective data suggests it is safe and durable.

The Evolving Role of Postgraduate Year 7 in Neurological Surgery Residency.

BACKGROUND AND OBJECTIVES: In 2013, all neurosurgery programs were mandated to adopt a 7-year structure. We sought to characterize how programs use the seventh year of training (postgraduate year 7 [PGY7]). METHODS: We surveyed all accredited neurosurgery programs in the United States regarding the PGY7 residents' primary role and the availability of enfolded fellowships. We compiled responses from different individuals in each program: chair, program director, program coordinator, and current chiefs. RESULTS: Of 120 accredited neurological surgery residency programs within the United States, 91 (76%) submitted responses. At these programs, the primary roles of the PGY7 were chief of service (COS, 71%), enfolded fellowships (EFF, 18%), transition to practice (10%), and elective time (1%). Most residencies have been 7-year programs for >10 years (52, 57%). Sixty-seven programs stated that they offer some form of EFF (73.6%). The most common EFFs were endovascular (57, 62.6%), spine (49, 53.9%), critical care (41, 45.1%), and functional (37, 40.7%). These were also the most common specialties listed as Committee on Advanced Subspecialty Training accredited by survey respondents. Spine and endovascular EFFs were most likely to be restricted to PGY7 (24.2% and 23.1%, respectively), followed by neuro-oncology (12, 13.2%). The most common EFFs reported as Committee on Advanced Subspecialty Training accredited but not restricted to PGY7 were endovascular (24, 26.4%) and critical care (23, 25.3%). CONCLUSION: Most accredited neurological surgery training programs use the COS as the primary PGY7 role. Programs younger in their PGY7 structure seem to maintain the traditional COS role. Those more established seem to be experimenting with various roles the PGY7 year can fill, including enfolded fellowships and transition-to-practice years, predominantly. Most programs offer some form of enfolded fellowship. This serves as a basis for characterization of how neurological surgery training may develop in years to come.

Terson syndrome secondary to aneurysmal subarachnoid hemorrhage in a child: illustrative case.

BACKGROUND: Terson syndrome is the phenomenon of intraocular hemorrhage in the setting of subarachnoid hemorrhage (SAH). Vision loss can lead to morbidity for the affected individual. Aneurysmal SAH related to intracranial aneurysms is rare in children. Studies have shown the incidence of Terson syndrome in adults with aneurysmal SAH to be over 40%; however, few cases of Terson syndrome in pediatric aneurysmal SAH have been reported. OBSERVATIONS: A 9-year-old male presented with altered mental status and seizures. Computed tomographic angiography showed aneurysmal SAH from a ruptured, left-sided posterior inferior cerebellar artery aneurysm. The patient underwent endovascular treatment with coiling and external ventricular drainage for SAH. Ophthalmological consultation for blurry vision revealed the diagnosis of Terson syndrome with decreased vision in the left eye, which was managed conservatively. LESSONS: Terson syndrome after SAH can occur in children. Prompt ophthalmological evaluation in pediatric patients with aneurysmal SAH is vital for recognition and management to decrease overall morbidity.

Initiating a Magnetic Resonance-Guided Focused Ultrasound Program: Comprehensive Workflow and Lessons Learned from the Initial 116 Cases.

INTRODUCTION: Magnetic resonance-guided focused ultrasound (MRgFUS) represents an incisionless treatment option for essential or parkinsonian tremor. The incisionless nature of this procedure has garnered interest from both patients and providers. As such, an increasing number of centers are initiating new MRgFUS programs, necessitating development of unique workflows to optimize patient care and safety. Herein, we describe establishment of a multi-disciplinary team, workflow processes, and outcomes for a new MRgFUS program. METHODS: This is a single-academic center retrospective review of 116 consecutive patients treated for hand tremor between 2020 and 2022. MRgFUS team members, treatment workflow, and treatment logistics were reviewed and categorized. Tremor severity and adverse events were evaluated at baseline, 3, 6, and 12 months post-MRgFUS with the Clinical Rating Scale for Tremor Part B (CRST-B). Trends in outcome and treatment parameters over time were assessed. Workflow and technical modifications were noted. RESULTS: The procedure, workflow, and team members remained consistent throughout all treatments. Technique modifications were attempted to reduce adverse events. A significant reduction in CRST-B score was achieved at 3 months (84.5%), 6 months (79.8%), and 12 months (72.2%) post-procedure (p < 0.0001). The most common post-procedure adverse events in the acute period (<1 day) were gait imbalance (61.1%), fatigue and/or lethargy (25.0%), dysarthria (23.2%), headache (20.4%), and lip/hand paresthesia (13.9%). By 12 months, the majority of adverse events had resolved with a residual 17.8% reporting gait imbalance, 2.2% dysarthria, and 8.9% lip/hand paresthesia. No significant trends in treatment parameters were found. CONCLUSIONS: We demonstrate the feasibility of establishing an MRgFUS program with a relatively rapid increase in evaluation and treatment of patients while maintaining high standards of safety and quality. While efficacious and durable, adverse events occur and can be permanent in MRgFUS.

Internal Neurolysis for the Treatment of Trigeminal Neuralgia: A Systematic Review.

INTRODUCTION: Trigeminal neuralgia (TN) remains a challenging disease with debilitating symptoms and variable efficacy in terms of treatment options. Microvascular decompression (MVD) with internal neurolysis (IN) is an alternative treatment that might benefit patients but has limited understanding. We performed a systematic review of IN for the treatment of TN. METHODS: Studies from 2000 to 2021 that had assessed IN for TN were aggregated and independently reviewed. RESULTS: A total of 520 patients in 12 studies were identified, with 384 who had undergone IN (mean age, 53.8 years; range, 46-61.4 years; mean follow-up, 36.5 months). Preoperative symptoms had been present for ∼55.0 months before treatment, and pain was predominantly in V2 and V3 (26.8%), followed by other distributions. Of the patients, 83.7% (range, 72%-93.8%) had had an excellent to good outcome (Barrow Neurological Institute pain scale score [BNI-PS], I-II). The pain outcomes at 1 year were excellent for 58%-78.4%, good or better for 77%-93.75%, and fair or better for 80%-93.75% of the patients. On average, facial numbness after IN was experienced by 96% of the patients. However, at follow-up, facial numbness remained in only 1.75%-10%. Most of the remaining numbness was not significantly distressing to the patients. Subgroup comparisons of IN versus recurrent MVD, IN versus radiofrequency ablation, the effects of IN in the absence of vascular compression, and IN with and without MVD were also evaluated. CONCLUSIONS: IN represents a promising surgical intervention for TN in the absence of vascular compression and for potential cases of recurrence. Complications were limited in general but require further study.

Prediction of hematoma expansion in spontaneous intracerebral hemorrhage: Our institutional experience.

BACKGROUND: Spontaneous intracerebral hemorrhage (sICH) is a disease process with high morbidity and mortality. In particular, hematoma expansion (HE) is a feared complication of sICH. With 15-40% of patients experiencing HE, it has become increasingly important to predict which sICH will remain stable and which will expand. OBJECTIVE: With new treatment options being developed, it is becoming increasingly important to be able to predict which hemorrhages are at high versus low risk for expansion. The authors of this study hope to reexamine variables associated with hematoma expansion in hopes of generating newer data on risk factors for expansion. METHODS: A retrospective analysis identified 334 patients who presented with sICH. The primary outcome was HE on follow up head CT. HE was defined as a greater than 33% increase or an absolute increase in 6 mL or more in overall volume between the two sets of CT images. Analysis was performed using unpaired t-test, Chi-square, and Fisher's exact tests, as appropriate. RESULTS: Of the 334 patients, 247 (74.0%) did not experience an expansion of their ICH while 87 (26.0%) did. Multivariable logistic regression was performed demonstrating ICH score of 3 or greater (4.76 (95% CI 2.60-8.72, p < 0.001) , cortical location of the sICH (1.77 (95% CI 1.03-3.04, p = 0.038), and presence of a fluid level (6.46 (95% CI 2.28-18.3, p < 0.001) as significant predictors of HE. CONCLUSIONS: Our study found that fluid-fluid levels on non-contrast CT, an ICH score 3 or greater, and lobar sICH were all more likely to expand.

Cranial Settling Causing Intracranial Hemorrhage Through Violation of the Skull Base by Cervical Spine Instrumentation.

BACKGROUND: Rheumatoid arthritis (RA) is a chronic inflammatory polyarthropathy that affects many synovial joints favoring the hands, knees, and vertebral articulations. Joint laxity manifests as subaxial instability, atlantoaxial instability, and cranial settling (CS). CASE DESCRIPTION: A 70-year-old woman with past medical history of RA, Hashimoto's thyroiditis, osteoporosis, history of C1-2 fusion for instability 15 years prior, with subsequent revision cervicothoracic fusion for degeneration, and trauma 2 years prior presents with new onset headache, nausea, and vomiting of 36-hour duration. Neurologic examination was only notable for mild right dysmetria. Workup revealed acute hemorrhage in the posterior fossa with migration of the right rod implant and screw tulip, as a result of CS. The patient underwent occipital-cervical fusion with removal of the migratory hardware. CONCLUSIONS: Intracranial rod migration and hemorrhage secondary to CS is a rare complication that must be brought to the attention of surgeons operating on patients with RA.

Developing standardized titles to classify the adverse events in 7,418 cranial and spinal neurosurgical procedures.

BACKGROUND: Neurosurgical procedures are life- and function-saving but carry a risk of adverse events (AE) which can cause permanent neurologic deficits. Unfortunately, there is lack of clearly defined AEs associated with given procedures, and their reporting is non-uniform and often arbitrary. However, with an increasing number of neurosurgical procedures performed, there is a need for standardization of AEs for systematic tracking. Such a system would establish a baseline for future quality improvement strategies. OBJECTIVE: To review our institutional AEs and devise standardized titles specific to the spine, tumor, functional, and vascular neurosurgery divisions. METHODS: A review of prospective monthly-reported morbidity and mortality (M&M) conference data within the Department of Neurological Surgery was conducted from January 2017 to December 2019. An AE was defined as any mortality, an "unintended and undesirable diagnostic or therapeutic event", "an event that prolongs the patient's hospital stay", or an outcome with permanent or transient neurologic deficit. RESULTS: A total of 1096 AEs from 7418 total procedures (14.8 %) were identified. Of those, 418 (5.6 %) were in cerebrovascular, 249 (3.4 %) were in neuro-oncology and 429 (5.8 %) were in the spine & functional divisions. The most common AEs across all divisions were infection (17 %), hemorrhage (11 %) and cerebrospinal fluid (CSF) leak (7.8 %). Other AEs were indirectly related to the neurosurgical procedure, such as deep vein thrombosis or pulmonary embolism (2.7 %), or pneumothorax (0.3 %). CONCLUSION: This work illustrates standardized AEs can be implemented universally across the spectrum of neurological surgery. Standardization can help identify recurring AE patterns through better tracking.

Internal Neurolysis with and without Microvascular Decompression for Trigeminal Neuralgia: Case Series.

OBJECTIVE: Microvascular decompression (MVD) has remained the first-line surgical treatment of trigeminal neuralgia when an offending vessel can be identified that is causing neurovascular compression. However, patients without neurovascular compression can either develop trigeminal neuralgia or recurrence after MVD. In addition, patients with venous and less severe arterial compression have been shown to have reduced efficacy after MVD. Internal neurolysis is a surgical technique used to separate the fascicles of the trigeminal nerve and might be a good option for patients with trigeminal neuralgia but without vascular compression. METHODS: A retrospective, institutional review board-approved medical record review was performed of adult patients with trigeminal neuralgia who had undergone internal neurolysis. The search resulted in 32 patients who had been treated from 2016 to 2019. The Barrow Neurological Institute (BNI) pain intensity scale and hypesthesia scale (HS) were used to determine the outcomes. RESULTS: The average follow-up was 20 months (range, 3-40 months). The postoperative outcomes showed a BNI pain intensity scale score of I for 50%, with excellent control in 56%, successful control in 78%, adequate control in 94%, and poor control in 6%. Significantly more patients without previous treatment had had successful pain control (95% vs. 54%). Six patients (19%) experienced pain recurrence and were significantly more likely to experience pain recurrence compared with patients without a previous procedure (39% vs. 5%). The overall BNI-HS score postoperatively was I for 28%, II for 69%, and III for 3%. CONCLUSIONS: Internal neurolysis with and without MVD has shown efficacy in treating trigeminal neuralgia in carefully selected patients.

Intra-arterial chemotherapy for retinoblastoma via the transradial route: Technique, feasibility, and case series.

OBJECTIVES: Intra-arterial chemotherapy (IAC) has become one of the most important pillars in retinoblastoma (Rb) management. It allows for targeted delivery of chemotherapy by superselective catheterization of the ophthalmic artery, thus, reducing systemic toxicity. As in most neurovascular procedures, IAC has traditionally been performed through a transfemoral access. However, recent publications have spurred the use of the transradial route for neuroendovascular procedures due to its lower complication rates and higher patient satisfaction. Here, we present the first case series in the literature on the technique, safety, and feasibility of IAC via the transradial route in the pediatric population. PATIENTS AND METHODS: We retrospectively analyzed our prospectively maintained database and present our technique and initial experience from 5 consecutive pediatric patients aged between 3 and 15 years who underwent 10 transradial IAC treatments. RESULTS: All IACs were performed successfully. Two patients had repeat IACs through the same wrist. There were no thromboembolic events or access site complications, such as hand ischemia or hematoma. All patients were discharged home the same day of the procedure. CONCLUSION: Our case series demonstrates the safety and feasibility of transradial IAC in pediatric patients with Rb. As more experience is gained with the transradial route for neurovascular procedures in adults, it may become the preferred route in some pediatric patients as well.

Inguinal Extrusion of a Ventriculoperitoneal Shunt.

BACKGROUND: Complications of ventriculoperitoneal (VP) shunts include migration into various anatomic compartments and even extrusion through tissue layers. CASE DESCRIPTION: A 31-year-old female patient with a VP shunt presented with distal shunt tubing extruding through the skin at the level of the inguinal ligament. Shunt hardware was removed, and cultures grew Dermacoccus. The patient was treated with broad-spectrum antibiotics and underwent placement of a lumboperitoneal shunt. CONCLUSIONS: Dermacoccus is a gram-positive skin organism with rare human pathogenicity and not previously known to cause shunt infections.

Waves of Pain Relief: A Systematic Review of Clinical Trials in Spinal Cord Stimulation Waveforms for the Treatment of Chronic Neuropathic Low Back and Leg Pain.

In the United States, chronic low back pain affects up to 37% of adults and is a multibillion dollar health care expenditure. Spinal cord simulation (SCS) has been established as an effective treatment alternative for chronic neuropathic low back and leg pain, especially for patients with failed back surgery syndrome or chronic regional pain syndrome. The field of SCS has rapidly advanced such that analgesia can now be achieved through numerous different waveforms, each claiming to offer improved outcomes. These waveforms include traditional paresthesia-based SCS (<100 Hz), paresthesia-free high-frequency SCS (5-10 kHz), burst SCS, and subperception SCS (1-5 kHz). Level 1 evidence critically evaluating the efficacy of these different waveforms is lacking. We conducted a systematic review of the literature in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines to identify all randomized controlled trials of SCS in the treatment of chronic neuropathic low back and leg pain, failed back surgery syndrome, or chronic regional pain syndrome. Of 38 eligible studies reviewed, 13 randomized controlled trials were finally included in our systematic review. We reviewed evidence from randomized controlled trials in the field of SCS that have established paresthesia-based SCS, paresthesia-free high-frequency SCS, burst SCS, and subperception SCS as viable treatment options for chronic neuropathic low back and leg pain. We critically evaluated evidence that claims to support the use of one waveform over another and reviewed the literature on patient preference for different waveforms.

A Three-dimensional Printed Low-cost Anterior Shoulder Dislocation Model for Ultrasound-guided Injection Training.

Anterior shoulder dislocations are the most common, large joint dislocations that present to the emergency department (ED). Numerous studies support the use of intraarticular local anesthetic injections for the safe, effective, and time-saving reduction of these dislocations. Simulation training is an alternative and effective method for training compared to bedside learning. There are no commercially available ultrasound-compatible shoulder dislocation models. We utilized a three-dimensional (3D) printer to print a model that allows the visualization of the ultrasound anatomy (sonoanatomy) of an anterior shoulder dislocation. We utilized an open-source file of a shoulder, available from embodi3D® (Bellevue, WA, US). After approximating the relative orientation of the humerus to the glenoid fossa in an anterior dislocation, the humerus and scapula model was printed with an Ultimaker-2 Extended+ 3D® (Ultimaker, Cambridge, MA, US) printer using polylactic acid filaments. A 3D model of the external shoulder anatomy of a live human model was then created using Structure Sensor®(Occipital, San Francisco, CA, US), a 3D scanner. We aligned the printed dislocation model of the humerus and scapula within the resultant external shoulder mold. A pourable ballistics gel solution was used to create the final shoulder phantom. The use of simulation in medicine is widespread and growing, given the restrictions on work hours and a renewed focus on patient safety. The adage of "see one, do one, teach one" is being replaced by deliberate practice. Simulation allows such training to occur in a safe teaching environment. The ballistic gel and polylactic acid structure effectively reproduced the sonoanatomy of an anterior shoulder dislocation. The 3D printed model was effective for practicing an in-plane ultrasound-guided intraarticular joint injection. 3D printing is effective in producing a low-cost, ultrasound-capable model simulating an anterior shoulder dislocation. Future research will determine whether provider confidence and the use of intraarticular anesthesia for the management of shoulder dislocations will improve after utilizing this model.