An interventional study of Intraoperative Nerve Monitoring and Surgical Procedure in Bone Neoplasm and Metastatic Malignant Neoplasm in the Bone, sponsored by City of Hope Medical Center. Recruiting at 1 site in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-11-10.
Sponsored by City of Hope Medical Center · Not applicable, Interventional, and Diagnostic
This clinical trial tests how well monitoring the sacral reflexes during surgery (intraoperatively) works to predict the post operative function for patients undergoing removal of the lowest part of the spine (sacrectomy) for pelvic bone cancers or patients undergoing spinal procedures. These surgical procedures can lead to damage to sacral root nerves which can result in impairment to the lower extremities, bowel, bladder, and sexual function. Intraoperative monitoring of sacral reflexes can provide objective, real-time information about pelvic nerve function during surgery. This can aid surgical decision-making and help surgeons better prepare patients to understand the changes that may have occurred to their function as a result of surgery. Intraoperative neuromonitoring may work well to predict postoperative function in patients undergoing sacrectomy for pelvic bone malignancy or patients undergoing spinal procedures.
PRIMARY OBJECTIVE:
I. To evaluate the feasibility of acquiring analyzable sacral reflex neuromonitoring data at baseline and case closure during surgery.
SECONDARY OBJECTIVES:
I. To characterize sacral reflex parameters amplitude, latency, waveform morphology, and Nerveana Power Index (NPI) at baseline under standardized intraoperative neuromonitoring conditions in patients undergoing spinal procedures without sacral nerve root involvement and patients undergoing sacrectomy.
II. To describe intraoperative changes in sacral reflex parameters from baseline to end-of-case during standardized intraoperative neuromonitoring in patients undergoing sacrectomy.
III. To characterize the relative contribution of individual sacral nerve roots to sacral reflex responses during intraoperative stimulation in patients undergoing sacrectomy.
IV. To characterize longitudinal changes in postoperative functional outcomes in patients undergoing sacrectomy.
EXPLORATORY OBJECTIVES:
I. To explore the association between intraoperative sacral reflex changes and postoperative functional outcomes in patients undergoing sacrectomy.
II. To explore the association between sacrifice of higher- versus lower-contributing sacral nerve roots and postoperative functional outcomes in patients undergoing sacrectomy.
OUTLINE:
Patients undergo neuromonitoring of the sacral reflexes at predefined time points during standard of care surgery.
After completion of study treatment, patients are followed up at 21 days, 6 weeks and 3, 6 and 12 months.
258 studies on the registry are indexed under Bone Neoplasms; 68 are open to participants now.
This study's planned enrollment of 50 is above the median of 44 across 163 interventional studies indexed under Bone Neoplasms.
Browse Bone Neoplasms studies →City of Hope Medical Center is the lead sponsor of 677 studies on the registry; 181 are open to participants now.
Of its 31 completed or terminated interventional studies of FDA-regulated products, 12 (39%) have results posted.
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Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Documented of the participant and/or legally authorized representative.
Undergoing surgery at City of Hope involving either:
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Patients undergo neuromonitoring of the sacral reflexes at predefined time points during standard of care surgery.
Procedure: Intraoperative Nerve Monitoring · Procedure: Surgical Procedure · Other: Survey Administration
Undergo intraoperative neuromonitoring
Also known as: Intraoperative Neuromonitoring, Intraoperative Neurophysiological Monitoring, IONM
Undergo standard of care surgery
Also known as: Operation, Surgery, Surgery Type, Surgery, NOS, Surgical, Surgical Intervention, Surgical Interventions, Surgical Procedures, Type of Surgery
Ancillary studies
Reproducible and interpretable bulbocavernosus reflex (BCR) and external urethral sphincter (EUS) reflex responses (feasibility)
Reproducible is defined as the ability to elicit a reflex response on repeated stimulation with consistent waveform presence and morphology at a given timepoint. Interpretable is defined as a recorded reflex response that is distinguishable from background noise and artifact and permits determination of response presence or absence and measurement of latency and amplitude. A two-sided 95% Clopper-Pearson confidence interval will be provided as a measure of precision.
Time frame: From baseline, Up to 1 year
Distribution of BCR reflex parameters
Amplitude, latency, frequency distribution, etc, measured via intraoperative neuromonitoring (IONM). ), Analyses will first be conducted separately within thoracolumber and sacrectomy patient groups. Descriptive statistics will be reported for BCR for each group. Next, to compare the mean values between the two groups, t-test or Mann-Whitney U-test will be implemented depending on the distribution of these parameters. Additionally, within the sacrectomy group, the changes of these parameters from baseline to the end-of-case will be assessed either through paired t-test or Wilcoxon's signed rank test, depending on the distribution of each parameter.
Time frame: From baseline, Up to 1 year
Distribution of EUS reflex parameters
Amplitude, latency, frequency distribution, etc, measured via IONM. Analyses will first be conducted separately within thoracolumber and sacrectomy patient groups. Descriptive statistics will be reported for EUS for each group. Next, to compare the mean values between the two groups, t-test or Mann-Whitney U-test will be implemented depending on the distribution of these parameters. Additionally, within the sacrectomy group, the changes of these parameters from baseline to the end-of-case will be assessed either through paired t-test or Wilcoxon's signed rank test, depending on the distribution of each parameter.
Time frame: From baseline, Up to 1 year
Change in BCR reflex parameters
Analyses will first be conducted separately within thoracolumber and sacrectomy patient groups. Descriptive statistics will be reported for BCR for each group. Next, to compare the mean values between the two groups, t-test or Mann-Whitney U-test will be implemented depending on the distribution of these parameters. Additionally, within the sacrectomy group, the changes of these parameters from baseline to the end-of-case will be assessed either through paired t-test or Wilcoxon's signed rank test, depending on the distribution of each parameter.
Time frame: From baseline, Up to 1 year
Change in EUS reflex parameters
Analyses will first be conducted separately within thoracolumber and sacrectomy patient groups. Descriptive statistics will be reported for EUS for each group. Next, to compare the mean values between the two groups, t-test or Mann-Whitney U-test will be implemented depending on the distribution of these parameters. Additionally, within the sacrectomy group, the changes of these parameters from baseline to the end-of-case will be assessed either through paired t-test or Wilcoxon's signed rank test, depending on the distribution of each parameter.
Time frame: From baseline, Up to 1 year
Relative contribution of individual right sacral nerve roots to BCR amplitude
Amplitudes among sacrectomy patients will be descriptively reported.
Time frame: During intraoperative stimulation, Up to Day 21
Relative contribution of individual left sacral nerve roots to BCR amplitude
Amplitudes among sacrectomy patients will be descriptively reported.
Time frame: During intraoperative stimulation, Up to Day 21
Relative contribution of individual right sacral nerve roots to EUS amplitude
Amplitudes among sacrectomy patients will be descriptively reported.
Time frame: During intraoperative stimulation, Up to Day 21
Relative contribution of individual left sacral nerve roots to EUS amplitude
Amplitudes among sacrectomy patients will be descriptively reported.
Time frame: During intraoperative stimulation, Up to Day 21
Bowel function scores
Assessed by Memorial Sloan Kettering Bowel Function Instrument. Will be described by graphs and descriptive statistics at each time point.
Time frame: From baseline, Up to 1 year
Bladder function scores
Assessed by International Consultation on Incontinence Questionnaire. Will be described by graphs and descriptive statistics at each time point.
Time frame: From baseline, up to 1 year
Sexual function scores
Assessed by Female Sexual Function Index (female patients only) and International Index of Erectile Function (male patients only). Will be described by graphs and descriptive statistics at each time point.
Time frame: From baseline, up to 1 year
Lower extremity function
Assessed by Toronto Extremity Salvage Score for the Lower Extremity. Will be described by graphs and descriptive statistics at each time point.
Time frame: From baseline, up to 1 year
Quality of life
Assessed by Functional Assessment of Cancer Therapy-General. Will be described by graphs and descriptive statistics at each time point.
Time frame: From baseline, up to 1 year
Postoperative urologic function
Assessed by post-void residual (PVR) or cystometry. Will be described by graphs and descriptive statistics at each time point.
Time frame: From baseline, up to 1 year
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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