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Double-jointed thumbs (hypermobility)

Prevalence in general population (GP): very common [~15% | 1:1 | weight: 1,00]

Most likely diagnostic options for double jointed thumbs - a manifestation involving hypermobility at the 2nd (basal) thumb joint; it has a strong connotation with the thumb-aspect of the so-called Beighton score, not to be confused with hyperextensible finger joints (ranked by 'weight' for the general population):


joints hypermobility syndrome [~75% | 1:50 | weight: 0,1]
fragile-x syndrome [~50% | 1:4K | weight: 0,0008]
Ehler-Danlos syndrome [?% | 1:5K | weight: ?]
Marfan syndrome [?% | 1:6K | weight: ?]



[1st figure = prevalence hand sign in condition | 2nd
figure = prevalence condition in GP | 3rd figure =
estimated hand sign weight for condition relative
to GP (>0,5 = present in majority of GP cases]
Example of double jointed thumbs: hypermobility at the 2nd (basal) thumb joint.

Quick summary:
double jointed thumbs usually represents an inconvenient but harmless condition not associated with any sort of disorder (only in a small minority it represents a feature for one of the 4 listed medical conditions).

[In every 100 double-jointed thumbs cases in the general population (GP) you can expect to find about 10 joints hypermobility syndrome cases, etc.]

NOTICE: Keep in mind that every single hand sign always bares the potential
to have an association with multiple psychology- and/or health related themes;
a solid assessment always requires a consideration of hand sign combinations!

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