Jaccoud described a deforming arthropathy in 1869 associated with recurrent rheumatic fever. van Vugt et al developed an index for identifying this form of arthropathy which can occur in a variety of disorders.
Parameters:
(1) ulnar drift
(2) swan neck deformities
(3) Boutonniere deformities
(4) Z deformity in thumbs
Parameter
Finding
Points
ulnar drift > 20 degrees
0 fingers
0
1 to 4 fingers
2
5 to 8 fingers
3
swan neck deformities
0 fingers
0
1 to 4 fingers
2
5 to 8 fingers
3
Boutonniere deformities
0 fingers
0
1 to 4 fingers
1
5 to 8 fingers
2
Z deformity in thumbs
none
0
1 thumb
2
both thumbs
3
total score =
= SUM(points for all 4 parameters)
Interpretation:
• minimum score: 0
• maximum score: 11
• A score > 5 is indicates Jaccoud’s arthropathy.
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