Chair-Integrated Foam Modifications in Coccydynia

NCT07533617 | Enrolling By Invitation

• 1 other identifier: 2024/002
• Study Type: interventional
• Target: 42
• Locations: 1 country
• Sites: 1

Brief Summary

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).

Conditions

Coccydynia

Keywords

Chair ergonomics; Foam geometry; Coccydynia; Pain; Pressure distribution; Sitting comfort

Outcome Measures

Primary Outcomes (2)

• Pressure Distribution Measurement (Load Cell-Equipped Chair System)

  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

  Evaluation of pain and functional status associated with coccydynia.

  Baseline + 1 week

Secondary Outcomes (2)

• Extended Nordic Musculoskeletal Questionnaire (NMQ-E)

  Baseline + 1 week

• EuroQol Quality of Life Scale (EQ-5D-3L)

  Baseline + 1 week

Study Arms (6)

Group 1: Chair with Foam Type A

EXPERIMENTAL

Participants will use ergonomically modified chair A with different foam properties during their working hours.

Device: Ergonomic Chair

Group 2: Chair with Foam Type B

EXPERIMENTAL

Participants will use ergonomically modified chair B with different foam properties during their working hours.

Device: Ergonomic Chair

Group 3: Chair with Foam Type C

EXPERIMENTAL

Participants will use ergonomically modified chair C with different foam properties during their working hours.

Device: Ergonomic Chair

Group 4: Chair with Foam Type D

EXPERIMENTAL

Participants will use ergonomically modified chair D with different foam properties during their working hours.

Device: Ergonomic Chair

Group 5: Chair with Foam Type E

EXPERIMENTAL

Participants will use ergonomically modified chair E with different foam properties during their working hours.

Device: Ergonomic Chair

Group 6: Chair with Foam Type F

EXPERIMENTAL

Participants will use ergonomically modified chair F with different foam properties during their working hours.

Device: Ergonomic Chair

Interventions

Ergonomic Chair DEVICE

Participants will use ergonomically modified chairs with different foam properties during their working hours.

Group 1: Chair with Foam Type A; Group 2: Chair with Foam Type B; Group 3: Chair with Foam Type C; Group 4: Chair with Foam Type D; Group 5: Chair with Foam Type E; Group 6: Chair with Foam Type F

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• 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

You may not qualify if:

• 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

Sponsors & Collaborators

• KTO Karatay University: lead

Study Sites (1)

Kto Karatay University

Konya, 42030, Turkey (Türkiye)

Location

MeSH Terms

Conditions

Pain

Condition Hierarchy (Ancestors)

Neurologic Manifestations; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Model Details: Participants will be randomly assigned to six parallel groups, each receiving a different chair design with distinct foam properties.

Study Record Dates

• First Submitted: April 10, 2026
• First Posted: April 16, 2026
• Study Start (Estimated): May 1, 2026
• Primary Completion (Estimated): June 1, 2026
• Study Completion (Estimated): June 15, 2026
• Last Updated: April 16, 2026

Record last verified: 2026-04

Data Sharing

• IPD Sharing: Will not share

Locations

TU (1)