Surgical intervention offers transformative functional independence for patients facing medically refractory neurodegenerative conditions. However, pronounced movement disorder surgery disparities continue to impede equitable treatment access between male and female individuals. While deep brain stimulation has historically demonstrated significant gender gaps in clinical utilization, clinicians expected that incisionless modalities like magnetic resonance-guided focused ultrasound would mitigate these inequities. A comprehensive, real-world registry analysis published in Clinical Neurology and Neurosurgery evaluates this critical therapeutic landscape to assess whether modern advances have effectively resolved historical treatment biases.

Understanding Movement Disorder Surgery Disparities in Clinical Care

Invasive neuromodulation transformed functional neurosurgery by offering customizable symptom control for disabling tremor and rigidity. Deep brain stimulation delivers electrical pulses to deep subcortical targets, including the ventral intermediate nucleus and subthalamic nucleus. However, stereotactic electrode placement requires cranial burr holes, conscious operating room participation, and ongoing pulse-generator management. Consequently, significant trepidation surrounding surgical risks frequently discourages prospective candidates. Multiple historical observational trials showed that female patients undergo deep brain stimulation far less frequently than male patients, despite experiencing equivalent disease burden.

Magnetic resonance-guided focused ultrasound recently emerged as an incisionless alternative for medically refractory tremor. By directing high-intensity acoustic energy through the intact cranium under real-time thermal magnetic resonance tracking, focused ultrasound creates precise thermal lesions. Because the procedure avoids burr holes and permanent hardware, clinicians hoped that it would reduce procedural reluctance among underrepresented demographic groups. Nevertheless, real-world comparative adoption data reveal that non-invasive mechanisms alone do not automatically eliminate systemic sex biases in surgical referrals and procedural selection.

Analyzing Real-World Evidence from the TriNetX Registry

To evaluate whether modern modalities resolved existing disparities, researchers conducted a massive retrospective study using the federated TriNetX clinical network. The investigative team evaluated records spanning two decades, from July 2005 through June 2025, capturing more than 600,000 unique patients with essential tremor or Parkinson's disease. Investigators rigorously applied propensity score matching to balance cohorts across baseline demographic factors, cardiovascular comorbidities, metabolic profiles, and disease duration.

Primary endpoints measured the relative hazards of undergoing deep brain stimulation, focused ultrasound ablation, or combined procedural interventions across sexes. Within the matched essential tremor cohort of 279,600 patients, female patients exhibited a significantly decreased probability of receiving any surgical treatment compared to men, showing a hazard ratio of 0.56. Similarly, analysis of the Parkinson's disease population confirmed a persistent procedural deficit among women. Consequently, the research demonstrates that introducing incisionless neurotechnology has not bridged the systemic divide between eligible candidates and interventional care.

Socio-Clinical Drivers Behind Disproportionate Treatment Rates

The persistence of these demographic divides indicates that procedural invasiveness represents only a fraction of access barriers. Clinical presentation differs markedly between biological sexes; for example, women with Parkinson's disease frequently manifest dyskinesias earlier, yet clinicians often mischaracterize motor fluctuations. Moreover, women encounter higher rates of diagnostic delay, remaining on conventional pharmacotherapy long after developing medical refractoriness. Therefore, delayed tertiary referral prevents timely evaluation by specialized movement disorder multidisciplinary boards.

Additionally, socio-cultural dynamics significantly influence procedural consent and treatment choices. Women frequently shoulder disproportionate caregiving burdens within domestic environments, often prioritizing family duties over elective surgical recovery. Furthermore, social support networks often differ, as aging women are more likely to live alone without domestic caregiving assistance during postoperative recovery. Studies also highlight divergent risk tolerance patterns between sexes, as women often express heightened concerns regarding procedural complications, cognitive consequences, and cosmetic impacts. Consequently, these layered psychological and structural factors suppress interventional procedural uptake.

Evaluating Movement Disorder Surgery Disparities Across Cohorts

Evaluating movement disorder surgery disparities across large cohorts provides vital insights for international healthcare delivery, including within expanding neurosurgical centers across India. As access to advanced therapies like deep brain stimulation and focused ultrasound grows in private and academic institutes, health equity must remain paramount. When healthcare professionals fail to actively recognize implicit bias during outpatient consultations, female patients miss crucial therapeutic windows.

Furthermore, financial access structures exacerbate these gaps. High capital costs and variable health insurance reimbursement for advanced neuromodulation and thermal ablation often place substantial burdens on families. Under resource-constrained scenarios, families frequently allocate discretionary financial resources toward male household members. Therefore, clinical neurologists must practice proactive disease surveillance. Identifying medically refractory progression early and initiating objective multidisciplinary surgical assessments guarantees that eligible female candidates receive unbiased counseling regarding both conventional neuromodulation and modern incisionless ablative alternatives.

Strategic Pathways Toward Healthcare Equity in Functional Neurosurgery

Eliminating entrenched treatment imbalances demands systematic structural solutions across hospital networks. First, healthcare systems should implement standardized, protocolized screening tools in outpatient neurology clinics to objectively flag medically refractory tremor. When clinicians use validated clinical scales rather than subjective patient requests, referral rates equalize significantly. In addition, institutions must design tailored patient education materials that directly address common concerns, demystifying focused ultrasound workflows and hardware maintenance.

Second, functional neurosurgery programs must establish comprehensive, patient-centered counseling frameworks. Multidisciplinary teams featuring movement disorder neurologists, functional neurosurgeons, specialized nurses, and social workers can holistically address home support challenges. By offering dedicated community resources, flexible outpatient follow-ups, and targeted peer support groups, clinical programs can empower hesitant female patients. Ultimately, rectifying referral divides ensures that cutting-edge surgical innovations enhance quality of life equally across diverse patient populations.

Frequently Asked Questions

What causes the sex gap in movement disorder surgery?

The gap stems from layered clinical and social factors. Women experience later tertiary referrals, diagnostic delays, and differing symptom manifestations. Additionally, unequal caregiving responsibilities, living alone without caregiver support, divergent risk tolerance, and subtle unconscious clinician biases significantly reduce female surgical referral rates and procedural selection.

Is MRgFUS clinically as effective for women as men?

Yes, clinical trials confirm that magnetic resonance-guided focused ultrasound achieves equivalent tremor suppression, safety, and functional recovery in both sexes. However, while therapeutic efficacy and adverse event profiles do not differ biologically, women face significant systemic and social barriers to accessing the procedure initially.

How can neurologists improve surgical equity in practice?

Neurologists can improve equity by adopting standardized motor assessment protocols to identify medication refractoriness objectively. Furthermore, clinicians must provide early, balanced counseling on deep brain stimulation and focused ultrasound, address domestic caregiver barriers directly, and eliminate personal referral biases through structured multidisciplinary evaluation panels.

Disclaimer: This content is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment. Healthcare professionals should exercise their independent clinical judgment when evaluating treatment options. Patient care decisions must be tailored to individual clinical circumstances. Refer to the latest local and national guidelines for clinical practice.

References

Ranjan M et al. The current landscape of sex-based disparities in surgical treatment of essential tremor and Parkinson's disease amidst MRgFUS adoption. Clin Neurol Neurosurg. 2026 Sep. doi: 10.1016/j.clineuro.2026.109479. PMID: 42155302.

Dalvi A, Eisenberg HM, Wu P, et al. Safety and efficacy of staged, bilateral magnetic resonance-guided focused ultrasound pallidothalamic tractotomy for motor complications of Parkinson's disease: a prospective, multicentre, single-arm trial. Lancet Neurol. 2026 Jul;25(7):654-663. doi: 10.1016/S1474-4422(26)00142-0. PMID: 42309086.

Chan AK, McGovern RA, Brown LT, et al. Disparities in access to deep brain stimulation surgery for Parkinson disease: interaction between African American race and Medicaid use. JAMA Neurol. 2014;71(3):291–299. doi: 10.1001/jamaneurol.2013.5798. PMID: 24445582.