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Fingertip-to-Floor Distance – Meaning and Measurement
The fingertip-to-floor distance (FFD) measures spinal and hip mobility. It indicates how far the fingertips remain from the floor when bending forward with knees straight.
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The fingertip-to-floor distance (FFD) measures spinal and hip mobility. It indicates how far the fingertips remain from the floor when bending forward with knees straight.
What is the Fingertip-to-Floor Distance?
The fingertip-to-floor distance (FFD) is a simple clinical measurement used to assess the mobility of the spine and hip joints. During this test, the examined person bends forward as far as possible while keeping the knees fully extended. The distance between the fingertips and the floor is then measured in centimeters. A smaller distance indicates better flexibility. If the person can touch or reach beyond the floor, the value is recorded as 0 cm or as a negative number.
How the Measurement is Performed
The FFD is measured using a standardized procedure:
- The person stands upright with feet shoulder-width apart or together.
- The knees remain fully extended throughout the movement.
- The person bends forward slowly and without momentum as far as possible.
- The distance between the fingertips and the floor is measured in centimeters.
- The test is typically repeated three times and the average value is recorded.
Clinical Significance
The FFD is a valuable tool in orthopedic and rheumatological assessment. It provides information about:
- Lumbar spine restrictions (e.g., due to disc herniation, spondyloarthritis, or degenerative changes)
- Shortened back and hamstring muscles
- Reduced hip joint mobility
- Chronic low back pain and monitoring of treatment progress
An elevated FFD (large distance to the floor) may indicate reduced spinal mobility and is often a sign of a condition requiring medical attention or a muscular imbalance.
Normal Values and Interpretation
There are no universally fixed normal values, as the FFD is strongly influenced by age, sex, body type, and fitness level. As a general guide:
- 0 cm or negative: very good flexibility; the floor is reached or exceeded
- 0–10 cm: normal to slightly reduced mobility
- 11–30 cm: noticeably reduced mobility; further evaluation recommended
- Over 30 cm: severely restricted mobility; clinically significant
During treatment follow-up, an improvement in the FFD is considered a positive indicator of therapeutic success.
Areas of Application
The fingertip-to-floor distance is used in a variety of medical and therapeutic contexts:
- Orthopedics and trauma surgery: evaluation of back complaints and spinal conditions
- Rheumatology: monitoring disease progression in inflammatory spinal conditions such as ankylosing spondylitis
- Physiotherapy: tracking progress during stretching and strengthening programs
- Sports medicine: assessing physical fitness and flexibility
- Occupational medicine: preventive examinations for physically demanding professions
Distinction from Other Tests
The FFD is often used alongside other mobility tests to provide a comprehensive picture of spinal function. Commonly used complementary tests include:
- Schober test: measures the expansion of the lumbar spine during forward bending
- Ott sign: evaluates thoracic spine mobility
- Trendelenburg test: assesses hip joint stability
References
- Moll JM, Wright V. Normal range of spinal mobility. An objective clinical study. Annals of the Rheumatic Diseases. 1971;30(4):381–386.
- Braun J, Sieper J. Ankylosing spondylitis. Lancet. 2007;369(9570):1379–1390.
- Magee DJ. Orthopedic Physical Assessment. 6th edition. St. Louis: Elsevier Saunders; 2014.
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