Fifty-six cases (34 males, 60.7%) of severe, deforming JSF were identified from the 1263 [691 females (54.7%) 88.0% of the entire village population] that were available for musculoskeletal examination. This represented a prevalence of 4.4% (95% CI, 3.3–5.6). Twenty-four cases of JSF (contained within 10 families) had at least one sibling who was also affected. […]