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Hyperextensible finger joints (range of motion: beyond normal)

Prevalence in general population (GP): very common [~10% | 1:1 | weight: 1,00]

Most likely diagnostic options for hyperextensible finger joints - not to be confused with double-jointed thumbs (ranked by 'weight' for the general population):


joints hypermobility syndrome [~75% | 1:50 | weight: 0,15]
trisomy 21 (= Down syndrome) [~80% | 1:700 | weight: 0,01]
fragile-x syndrome [~60% | 1:4K | weight: 0,0015]
cri-du-chat syndrome [?% | 1:30K | weight: ?]


Beyond hyperextensible finger joints, a condition involving 'very flexible fingers' has been reported to be about 2.5x more common (62,5%) in a group of extraverted Dutch students, who score very high for the Big Five personality dimension Extraversion (the 1997 study also reports that 'stiff fingers' have been observed twice more often (25%) in Extraversion low scorers).

[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)]
Example of hyperextensible finger joints: beyond normal range of motion.

Quick summary:
hyperextensible finger joint is a relatively common condition that is present in a small minority of the general population; the condition is especially frequently present in joints hypermobility syndrome, trisomy 21 & fragile-x syndrome.

[In every 100 hyperextensible finger joints cases in the general population (GP) you can expect to find about 15 joint hypermobility syndrome cases, 1 trisomy 21 case, 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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