Investigation of the Relationship Between Pes Planus and Piriformis Syndrome: A Case-Control Study

NCT07674433 | Active Not Recruiting

• 1 other identifier: 2026/065
• Study Type: observational
• Target: 70
• Locations: 1 country
• Sites: 1

Brief Summary

The aim of this study is to investigate the relationship between Pes Planus and Piriformis Syndrome. The study will be conducted on individuals aged 18-65 years who are native Turkish speakers, have Turkish reading and writing skills, have been diagnosed with piriformis syndrome, and voluntarily agree to participate. Participants will consist of individuals who have not previously undergone lumbar, hip, or lower extremity surgery and have not received injection therapy (corticosteroids, PRP) or any other physiotherapy program within the last three months.

Conditions

Piriformis Syndrome; Pes Planus

Keywords

piriformis syndrome; pes planus; gluteal pain; pelvic pain; Navicular Drop

Outcome Measures

Primary Outcomes (2)

• Foot Posture Index (FPI-6)

  To comprehensively assess the static foot posture of the participants, the Foot Posture Index, which has proven reliability in the literature, will be used. During the assessment, the participant will be fixed in a relaxed standing position with their arms at their sides and facing forward, distributing their weight equally on both feet.

  Baseline

• Navicular Drop Test(NDT)

  In evaluating the foot posture of the participants, the Navicular Drop Test (NDT), which has proven reliability and validity in the literature, will be used (10). The Navicular Drop Test is a clinical measurement method used to evaluate the arch structure and dynamic stability of the foot.The measurement process consists of two stages: First, with the foot unloaded, the height of this marked point from the ground is measured with a millimeter ruler or caliper. Then, the participant is asked to stand up without changing the foot position and distribute their body weight evenly between both legs. In this loaded position, the distance of the navicular tubercle from the ground is measured again. Finally, the difference between the height in the seated position and the height in the standing position is calculated. This drop, recorded in millimeters, indicates how much the foot flexes or collapses under load.

  Baseline

Secondary Outcomes (2)

• Pain assessment

  Baseline

• Demographic information

  Baseline

Study Arms (2)

piriformis sendrom group

Investigation of pes planus in individuals with piriformis syndrome.

healthy group

Investigation of pes planus in healthy individuals

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Probability Sample

Study Population

The study will be conducted on individuals aged 18-65 years who are native Turkish speakers, have Turkish reading and writing skills, have been diagnosed with piriformis syndrome (PS), and have voluntarily agreed to participate in the study and healthy group.

You may qualify if:

• Piriformis group
• years old
• Clinical diagnosis of piriformis syndrome
• Positive FAIR test
• Piriformis tenderness on palpation Control group
• No piriformis syndrome
• No hip or lower back pain
• No neurological disease

You may not qualify if:

• Herniated disc (L5-S1 radiculopathy),
• previous hip surgery,
• inflammatory joint diseases
• neurological deficits…

Sponsors & Collaborators

• Kahramanmaras Sutcu Imam University: lead

Study Sites (1)

Kahramanmaraş Sütçü İmam Üniversitesi

Kahramanmaraş, onikişubat, 46100, Turkey (Türkiye)

Location

Biospecimen

Retention: SAMPLES WITHOUT DNA

non-invasive tests and scale

MeSH Terms

Conditions

Piriformis Muscle Syndrome; Flatfoot; Pelvic Pain

Condition Hierarchy (Ancestors)

Sciatic Neuropathy; Mononeuropathies; Peripheral Nervous System Diseases; Neuromuscular Diseases; Nervous System Diseases; Nerve Compression Syndromes; Neuralgia; Pain; Neurologic Manifestations; Signs and Symptoms; Pathological Conditions, Signs and Symptoms; Talipes; Foot Deformities, Acquired; Foot Deformities; Musculoskeletal Diseases; Foot Deformities, Congenital; Lower Extremity Deformities, Congenital; Limb Deformities, Congenital; Musculoskeletal Abnormalities; Congenital Abnormalities; Congenital, Hereditary, and Neonatal Diseases and Abnormalities

Study Design

• Study Type: observational
• Observational Model: CASE CONTROL
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Assistant Proffesor

Study Record Dates

• First Submitted: June 23, 2026
• First Posted: June 29, 2026
• Study Start: June 1, 2026
• Primary Completion: August 1, 2026
• Study Completion (Estimated): August 30, 2026
• Last Updated: June 29, 2026

Record last verified: 2026-06

Data Sharing

• IPD Sharing: Will not share

Locations

TU (1)