The complete Chopart joint capsule encloses both the talonavicular and calcaneocuboid articulations — the two joints forming the Chopart (midtarsal or transverse tarsal) joint line. The capsules are separate but function as a coordinated unit.
Encloses both midtarsal joint articulations, allows the combined pronation-supination movement of the midtarsal joint that adapts the foot to terrain, and contains the synovial fluid for both TN and CC joint lubrication.
Chopart joint arthritis produces midfoot pain over both the TN and CC joints. Isolated TN fusion effectively treats combined Chopart arthritis by eliminating the driving articulation. Complete Chopart arthrodesis (TN + CC fusion) is reserved for rigid deformity or failed isolated TN fusion.
Combined talonavicular and calcaneocuboid arthritis managed by isolated TN fusion (which effectively arthrodeses the Chopart complex by eliminating the dominant joint motion) or complete Chopart arthrodesis.
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