Sagittal Spinopelvic and Coccygeal Alignment in Sitting and Standing Positions in Coccydynia

NCT07076927 | Completed

• 1 other identifier: 2024/4-4/6
• Study Type: observational
• Target: 50
• Locations: 1 country
• Sites: 2

Brief Summary

This observational cross-sectional study aims to investigate the differences in spinopelvic and coccygeal morphometric parameters in standing and sitting positions among patients diagnosed with coccydynia. A total of 50 adult patients (aged 25-65 years) diagnosed with coccydynia based on clinical evaluation and imaging findings were included. Lateral radiographs were obtained in both standing and sitting positions. Radiological assessments included spinopelvic parameters such as sacral slope (SS), pelvic tilt (PT), pelvic incidence (PI), sacral table angle (STA), and sacral kyphosis (SK), along with coccygeal morphology based on the Postacchini-Massobrio classification. The study further aimed to explore whether these morphometric differences are associated with the presence of low back pain and to assess variations across different coccygeal morphology types.

Conditions

Coccydynia; Sagittal Balance; Morphological Analysis and Classification

Keywords

Coccygeal morphometry; spinopelvic morphometry; os coccygis; sagittal plane; coccydynia

Outcome Measures

Primary Outcomes (22)

• Sacral Slope (SS)

  Sacral slope will be measured on standardized lateral radiographs in both standing and sitting positions.

  At baseline (single time point)

• Pelvic Tilt (PT)

  Pelvic tilt will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Pelvic Incidence (PI)

  Pelvic Incidence will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Spinosacral Angle (SSA)

  Spinosacral Angle will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Sacral Kyphosis (SK)

  Sacral Kyphosis will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Sacral Table Angle (STA)

  Sacral Table Angle will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Thoracic Kyphosis (TK)

  Thoracic Kyphosis will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Lumbar Lordosis (LL)

  Lumbar Lordosis will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Sagittal Vertical Axis (SVA)

  Sagittal Vertical Axis will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Thoracolumbar Angle (TPA-T1PA)

  Thoracolumbar Angle will be measured on sagittal radiographs in both standing and sitting positions.

  At baseline (single time point)

• Coccygeal Morphology- Vertebral Segment Number

  Coccygeal features will be evaluated

  At baseline (single time point)

• Coccygeal Morphology- sacrococcygeal joint fusion

  Coccygeal features will be evaluated

  At baseline (single time point)

• Coccygeal Morphology- intercoccygeal joint fusion

  Coccygeal features will be evaluated

  At baseline (single time point)

• Coccygeal Morphology- segmental angulation

  Coccygeal features will be evaluated

  At baseline (single time point)

• Coccygeal Morphology- presence of coccygeal spicules

  Coccygeal features will be evaluated

  At baseline (single time point)

• Coccygeal Morphometry Type

  Classification (Type 1-5)

  At baseline (single time point)

• Coccygeal Mobility

  Coccygeal mobility will be assessed by measuring the angular difference of the coccyx between the standing and sitting positions on lateral radiographs. The change in coccygeal angle reflects the degree of coccygeal movement during postural transition.

  At baseline (single time point)

• Sacrococcygeal Angle (SKA)

  SKA will be measured using the angle between the sacral axis and first coccygeal segment on lateral radiographs.

  At baseline (single time point)

• Intercoccygeal Angle (IKA)

  IKA will be measured as the angle between coccygeal segments

  At baseline (single time point)

• Coccygeal Height (KY)

  The vertical height of the coccyx from the tip to the base will be measured in the sagittal plane. ertical height of the coccyx from the tip to the base will be measured in the sagittal plane. Vertical height of the coccyx from the tip to the base will be measured in the sagittal plane.

  At baseline (single time point)

• Sacral Height (SY)

  Vertical sacral height will be assessed from the superior to the inferior sacral end on the lateral radiograph. ertical height of the coccyx from the tip to the base will be measured in the sagittal plane. Vertical height of the coccyx from the tip to the base will be measured in the sagittal plane.

  At baseline (single time point)

• Sacrococcygeal Height (SKY)

  Combined vertical height from sacral promontory to coccyx.

  At baseline (single time point)

Secondary Outcomes (3)

• Clinical Assessment- Pain severity

  At baseline (single time point)

• Clinical Assessment - Quality of Life (SF-12)

  At baseline (single time point)

• Clinical Assessment - Disability - Oswestry Disability Index (ODI) Score

  At baseline (single time point)

Study Arms (1)

Coccydynia

Coccydynia patients

Eligibility Criteria

• Age: 25 Years - 65 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

patients aged 25 to 65 years who presented to the University of Health Sciences Fatih Sultan Mehmet Training and Research Hospital with a preliminary diagnosis of coccydynia and were clinically confirmed were consecutively enrolled. Patients with a history of spinal trauma, surgery, congenital deformities, malignancy, or rheumatological disease were excluded.

You may qualify if:

• Patients aged between 25 and 65 years
• Clinically diagnosed with coccydynia
• Provided informed consent to participate in the study

You may not qualify if:

• Presence of any disease that may cause spinal malalignment
• Any hip- or knee-related condition that may lead to spinal malalignment
• History of surgery involving the cervical, thoracic, lumbar, or coccygeal spine

Sponsors & Collaborators

• Fatih Sultan Mehmet Training and Research Hospital: lead

Study Sites (2)

Fatih Sultan Mehmet Training and Research Hospital

Istanbul, 34098, Turkey (Türkiye)

Location

Fatih Sultan Mehmet Training and Research Hospital

Istanbul, 34752, Turkey (Türkiye)

Location

Study Officials

• Aslinur Keles, MD., PhD

  Fatih Sultan Mehmet Training and Research Hospital

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: CROSS SECTIONAL
• Target Duration: 1 Day
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Principal Investigator

Study Record Dates

• First Submitted: June 3, 2025
• First Posted: July 22, 2025
• Study Start: August 1, 2024
• Primary Completion: January 10, 2025
• Study Completion: May 25, 2025
• Last Updated: July 22, 2025

Record last verified: 2025-07

Locations

TU (2)