The presence of chondroitin and keratan sulfate in the dorsal and volar plates is important in resisting compression forces against the condyles of the proximal phalanx.
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These three bands are united by a transverse retinacular ligament, which runs from the palmar border of the lateral band to the flexor sheath at the level of the joint and which prevents dorsal displacement of that lateral band.
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In the PIP joint, extension is more limited because of the two so called check-rein ligaments, which attach the volar plate to the proximal phalanx.
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