Reliability of Goniometric Techniques for Measuring Hip Flexor Length Using the Modified Thomas Test.

Area of Science:

• Orthopedics
• Physical Therapy
• Musculoskeletal Biomechanics

Background:

• The Modified Thomas Test (MTT) assesses hip flexor flexibility, crucial for musculoskeletal examinations.
• Existing research shows conflicting reliability data for the MTT, often due to inconsistent control of pelvic tilt.
• Inaccurate pelvic tilt control can lead to erroneous hip extension measurements.

Purpose of the Study:

• To evaluate the intra- and inter-rater reliability of the Modified Thomas Test (MTT) for assessing hip flexor length.
• To determine if controlling for pelvic tilt improves the reliability of MTT measurements.
• To provide evidence for the clinical utility of the MTT in physical therapy.

Main Methods:

• A reliability study involving 64 healthy participants.
• The MTT was performed twice on each participant by two physical therapists (one experienced, one student).
• Goniometric measurements of hip extension range of motion were taken with enforced neutral pelvic tilt, using a double-blind protocol.

Main Results:

• High intra-rater reliability (ICC = 0.911) and inter-rater reliability (ICC = 0.851) were observed for the MTT.
• Standard Errors of Measurement (SEMs) indicated minimal variability in the collected data.
• The average hip extension range of motion measured was 5.43 ± 9.73 degrees.

Conclusions:

• The Modified Thomas Test (MTT) is a reliable clinical tool for assessing hip flexor length when pelvic tilt is controlled.
• Reliable MTT measurements have significant implications for diagnosing orthopedic limitations causing low back, hip, and knee pain.
• This study supports the use of the MTT in physical therapy for accurate hip flexor assessment.