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. 2026 Aug 8;27:955. doi: 10.1186/s12891-026-10343-9

Table 2.

Incidence of progression to hemophilic arthropathy by joint site

Number of joints observed Joint-years of follow-up Number of HA progression events Incidence rate per 1,000 joint-years of follow-up
Elbow 201 2,944 31 10.5
Knee 202 3,198 14 4.4
Ankle 180 2,492 49 19.7
Total 583 8,634 94 10.9

Overall and joint-specific incidence of progression to hemophilic arthropathy, defined as reaching Arnold–Hilgartner stage ≥ IV. Incidence rates are shown per 1,000 joint-years of follow-up

HA hemophilic arthropathy