Trends in utilization: has extremity MR imaging replaced diagnostic arthroscopy?
OBJECTIVE
To examine the relative change in utilization of magnetic resonance (MR) imaging of the extremities versus diagnostic and therapeutic arthroscopy.


METHODS
Using the 1993, 1996, and 1999 nationwide Medicare Part B databases, utilization rates (per 100000) were determined for upper and lower extremity MR imaging, diagnostic arthroscopy and therapeutic arthroscopy using CPT-4 codes. Utilization of extremity MR imaging was compared with that of diagnostic and therapeutic arthroscopy in 10 geographic regions of the United States and tracked over time.


RESULTS
Combined lower and upper extremity MR imaging utilization per 100000 increased from 393 to 1056 in 1999 (+168.7%). Utilization of diagnostic arthroscopy of the extremities decreased from 18 in 1993 to 8 in 1999 (-55.6%); therapeutic arthroscopy rates increased from 461 in 1993 to 636 in 1999 (+40.0%). Specifically, from 1993 to 1999, utilization of lower extremity MR imaging increased from 270 to 661 (+144.8%). Utilization of diagnostic arthroscopy of the knee over the same time period decreased from 11 to 5 (-54.5%); therapeutic arthroscopy increased from 394 to 501 (+27.2%). Similarly, utilization rates for upper extremity MR imaging increased from 123 to 395 (+221.1%). Utilization of diagnostic arthroscopy of the shoulder over the same time period decreased from 7 to 2 (-71.4%); therapeutic arthroscopy increased from 44 to 104 (+136.4%). No specific geographic trends were ascertained.


CONCLUSIONS
The utilization of MR imaging of the extremities has markedly increased from 1993 to 1999. During the same time period the utilization of diagnostic arthroscopy has decreased and that of therapeutic arthroscopy has increased. These findings support the hypothesis that there is increased reliance of clinical practitioners on the diagnostic information provided by MR imaging in preoperative clinical decision-making.
Glynn
Nicole
N
Department of Radiology, Thomas Jefferson University Hospital, Suite 3390 Gibbon Building, 111 South 11th Street, Philadelphia, PA 19107, USA.
Morrison
William B
WB
Parker
Laurence
L
Schweitzer
Mark E
ME
Carrino
John A
JA
D000368:Aged; D001182:Arthroscopy / Q000379:methods / Q000706:statistics & numerical data*; D016208:Databases, Factual; D005121:Extremities / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis*; D007596:Joints / Q000473:pathology / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000379:methods / Q000706:statistics & numerical data*; D016345:Medicare Part B / Q000706:statistics & numerical data; D014481:United States