Chair-Integrated Foam Modifications in Coccydynia

April 10, 2026 updated by: KTO Karatay University

Ergonomic Effects of Material- and Geometry-Modified, Chair-Integrated Foams on Pressure Distribution, Pain, and Sitting Comfort in Individuals With Coccydynia

The aim of this study is to evaluate the effects of chairs with different ergonomic designs on quality of life, discomfort, and pain in individuals with coccydynia (tailbone pain).

Study Overview

Status

Enrolling by invitation

Conditions

Intervention / Treatment

Detailed Description

Participants aged 18-65 years who work at a desk for at least 5-6 hours per day will be included in the study. Information such as age, height, body weight, education level, family type, smoking status, sex, marital status, working posture (sitting, standing, or both), duration of working hours, job type (production or administrative), regular exercise habits, presence of chronic diseases, and absence of any spinal problems (e.g., no diagnosed lumbar disc herniation) will be recorded. Participants will be randomly assigned to six groups. Before using the chairs, participants will be seated on a load cell-equipped chair to assess weight distribution. The distribution of body weight across different regions while sitting will be recorded in kilograms. This measurement will be repeated three times, and the average will be recorded.

After the measurement, participants will be provided with specially designed chairs and asked to work using these chairs. Six different chair designs will be developed for the study. The reason for having six types of chairs is that the foam properties used in each chair will differ from one another.

Study Type

Interventional

Enrollment (Estimated)

42

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Aged between 18 and 65 years
  • Working at a desk for at least 5-6 hours per day
  • Experiencing coccydynia (tailbone pain)
  • Able to sit independently without assistive support
  • No diagnosed spinal disorders (e.g., lumbar disc herniation)
  • Willing to use the assigned chair during working hours for 1 week
  • Able to understand and complete questionnaires
  • Provided written informed consent

Exclusion Criteria:

  • History of spinal surgery
  • Diagnosed spinal disorders (e.g., lumbar disc herniation, scoliosis, severe degenerative spine disease)
  • Neurological disorders affecting posture, sitting balance, or sensation
  • Severe musculoskeletal conditions (e.g., hip or pelvic disorders) that may affect sitting
  • Pregnancy
  • Inability to sit for prolonged periods
  • Use of assistive seating devices (e.g., orthopedic cushions) during the study period
  • Regular use of pain medication that may affect outcome measures

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Group 1: Chair with Foam Type A
Participants will use ergonomically modified chair A with different foam properties during their working hours.
Device: Ergonomic Chair
Participants will use ergonomically modified chairs with different foam properties during their working hours.
Experimental: Group 2: Chair with Foam Type B
Participants will use ergonomically modified chair B with different foam properties during their working hours.
Device: Ergonomic Chair
Participants will use ergonomically modified chairs with different foam properties during their working hours.
Experimental: Group 3: Chair with Foam Type C
Participants will use ergonomically modified chair C with different foam properties during their working hours.
Device: Ergonomic Chair
Participants will use ergonomically modified chairs with different foam properties during their working hours.
Experimental: Group 4: Chair with Foam Type D
Participants will use ergonomically modified chair D with different foam properties during their working hours.
Device: Ergonomic Chair
Participants will use ergonomically modified chairs with different foam properties during their working hours.
Experimental: Group 5: Chair with Foam Type E
Participants will use ergonomically modified chair E with different foam properties during their working hours.
Device: Ergonomic Chair
Participants will use ergonomically modified chairs with different foam properties during their working hours.
Experimental: Group 6: Chair with Foam Type F
Participants will use ergonomically modified chair F with different foam properties during their working hours.
Device: Ergonomic Chair
Participants will use ergonomically modified chairs with different foam properties during their working hours.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Pressure Distribution Measurement (Load Cell-Equipped Chair System)
Time Frame: Baseline + 1 week
Assessment of sitting pressure distribution across right, left, and central regions in kilograms using a custom-designed load cell-integrated chair.
Baseline + 1 week
Paris Questionnaire
Time Frame: Baseline + 1 week
Evaluation of pain and functional status associated with coccydynia.
Baseline + 1 week

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Extended Nordic Musculoskeletal Questionnaire (NMQ-E)
Time Frame: Baseline + 1 week
Evaluation of musculoskeletal symptoms related to different body regions.
Baseline + 1 week
EuroQol Quality of Life Scale (EQ-5D-3L)
Time Frame: Baseline + 1 week
Assessment of general health-related quality of life.
Baseline + 1 week

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

KTO Karatay University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

May 1, 2026

Primary Completion (Estimated)

June 1, 2026

Study Completion (Estimated)

June 15, 2026

Study Registration Dates

First Submitted

April 10, 2026

First Submitted That Met QC Criteria

April 10, 2026

First Posted (Actual)

April 16, 2026

Study Record Updates

Last Update Posted (Actual)

April 16, 2026

Last Update Submitted That Met QC Criteria

April 10, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2024/002

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Individual participant data (IPD) will not be shared due to privacy and confidentiality considerations.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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