Joint-specific multidimensional assessment of pain (J-MAP): factor structure, reliability, validity, and responsiveness in patients with knee osteoarthritis.
OBJECTIVE
To develop a reliable and valid instrument for measuring and monitoring joint-specific pain.


METHODS
Developed using patient interviews, reviews of pain literature, and expert input from orthopedic surgeons, the final Joint-Specific Multidimensional Assessment of Pain (J-MAP) includes the 6-item Pain Sensory and the 4-item Pain Affect subscales. Scores on the J-MAP Pain Sensory and Affect subscales range from 0 to 100, with higher scores indicating more pain intensity and worse pain distastefulness, respectively. Following the assessment of the factor structure, patients' scores (n = 180) on the J-MAP subscales were converted to equal interval scores using Rasch analyses. A psychometric evaluation of the items and Rasch-calibrated scores was conducted and included an assessment of reliability, validity, and responsiveness for use with patients with radiographic knee osteoarthritis.


RESULTS
Evidence from the factor analyses showed that the J-MAP Pain Sensory and Affect items made up 2 distinct factors. Internal consistency estimates for the J-MAP subscales exceeded 0.85. The J-MAP subscales showed evidence for validity and were shown to be internally and externally responsive, demonstrating greater responsiveness than the Arthritis Impact Measurement Scale or the Medical Outcome Study Short Form-36 pain subscales. Finally, evidence was found supporting the J-MAP subscales' ability to distinguish target joint pain from pain emanating from other musculoskeletal conditions.


CONCLUSIONS
The J-MAP is a reliable, valid, and responsive measure for assessing joint-specific pain at a single time point, or changes over time for one or a group of patients with knee osteoarthritis. With this initial evidence of its psychometric rigor, further testing of the measurement properties of the J-MAP in other joints and in other populations should be undertaken.
O'Malley
Kimberly J
KJ
Houston Center for Quality of Care and Utilization Studies, Houston, Texas 77030, USA. komalley@bcm.tmc.edu
Suarez-Almazor
Maria
M
Aniol
Julie
J
Richardson
Peter
P
Kuykendall
David H
DH
Moseley
J Bruce
JB
Wray
Nelda P
NP
D000203:Activities of Daily Living; D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009140:Musculoskeletal Diseases / Q000150:complications / Q000175:diagnosis*; D020370:Osteoarthritis, Knee / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D017063:Outcome Assessment, Health Care; D010146:Pain / Q000175:diagnosis* / Q000209:etiology; D010147:Pain Measurement / Q000379:methods* / Q000592:standards; D011859:Radiography; D015203:Reproducibility of Results