A 68-year-old man with rheumatoid arthritis for 15 years has the following bone densitometry results obtained on a dual energy x-ray absorptiometry scan:
T score
Lumbar spine +1.3 +2.0
Z score Femoral neck −2.4 −1.7
What is the most likely explanation for the discrepancy between the femoral neck and lumbar spine readings?
A. Metastaticbonedisease.
B. Osteonecrosisofthehip.
C. Osteophyte formation in the lumbar spine.
D. Pagetdiseaseinthelumbarspine.
E. Synovitis in the hip.