Roemer et al reported a scoring system to describe the MRI findings of a person being evaluated for osteoarthritis in a standard fashion. The authors are from multiple institutions in the United States, Europe, Canada and Australia.
Exam: MRI of the hip
The HOAMS system is divided into 3 parts:
(1) findings other than cartilage, bone marrow lesions and subchondral cysts
(2) bone marrow lesions and subchondral cysts
(3) cartilage defects
Parameters:
(1) osteophytes
(2) labrum
(3) synovitis
(4) effusion
(5) loose bodies
(6) attrition (flattening of femoral head or acetabular curvature)
(7) dysplasia
(8) greater trochanter tendonitis/bursitis
(9) labral hypertrophy
(10) paralabral cysts
(11) herniation pits
Parameter
Finding
Grade
osteophytes
none
0
equivocal or questionable
1
small, beak-like
2
intermediate size
3
proliferative large
4
labrum
no changes
0
intralabral signal alteration
1
definite labral tear
2
partial or complete labral maceration
3
synovitis
synovial thickness < 2 mm
0
synovial thickness 2-4 mm
1
synovial thickness > 4 mm
2
effusion
none
0
small
1
large
2
loose bodies
none
0
1 loose body
1
2 loose bodies
2
>= 3 loose bodies
3
attrition
no
0
yes
1
dysplasia
no
0
yes
1
greater trochanter tendonitis or bursitis
no
0
yes
1
labral hypertrophy
no
0
yes
1
paralabral cysts
no
0
yes
1
herniation pits
no
0
yes
1
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