Analysis of Crepitus in Human Subjects

Inclusion Criteria: Healthy (no LBP) Subjects (n=6): * 30 to 75 years of age * No previous history of LBP lasting for more than two weeks, or no more than three episodes of back pain of brief duration (one week) in any given year (to recruit healthy subjects with no history, or a minimal history, of LBP). * No presence of current LBP * Female with a BMI of 28 or less; Male with a BMI of 30 or less. LBP Subjects Criteria (n=6): * 30 to 75 years of age * Current LBP of at least one-week (7 days) duration * Female with a BMI of 28 or less; Male with a BMI of 30 or less. Exclusion Criteria: Healthy Subjects: * Under 30 or over 75 years of age * History of an episode of LBP lasting for more than two weeks, or more than three episodes of back pain of brief duration (one week) in any given year (see reasons for no LBP in Inclusion Criteria) * Presence of Current LBP * Prior spinal surgery * Presence of current spinal fracture, tumor, infection, or scoliosis of greater than 5 degrees (Cobb's angle, scoliosis decreases ability to place the accelerometers); or other known significant pathology * Known allergies to latex or adhesives (including Band-Aids) applied to the skin (accelerometers are taped to the skin) * BMI over 30 for males; BMI over 28 for females (subject will be weighed at exam) * Pregnancy (because of unique biomechanical patterns and changes in the ranges of motion that occur during pregnancy) * Positive findings on any of the orthopedic or neurological tests li…