Canoso J J, Liu N, Traill M R, Runge V M
Department of Medicine (Rheumatology), New England Medical Center, Boston, MA 02111.
Ann Rheum Dis. 1988 Nov;47(11):910-2. doi: 10.1136/ard.47.11.910.
To clarify the function of the retrocalcaneal bursa the hindfoot was studied by magnetic resonance imaging at various positions of the ankle joint. In normal individuals a tongue-like extension of the retromalleolar fat pad entered the bursa during plantar flexion as the angle between Achilles tendon and calcaneus widened. The reverse occurred in dorsiflexion. In contrast, in a patient with spondyloarthritis and retrocalcaneal bursitis excessive cavitary fluid prevented the intrusion of the fat pad. The sliding motion of the fat pad in and out of the bursa during ankle motion allows a more caudal, advantageous insertion of the Achilles tendon into the calcaneus.
为阐明跟腱后囊的功能，通过磁共振成像在踝关节的不同位置对后足进行了研究。在正常个体中，当跟腱与跟骨之间的角度变宽时，踝后脂肪垫的舌状延伸在跖屈时进入滑囊。背屈时则相反。相比之下，在一名患有脊柱关节炎和跟腱后囊炎的患者中，过多的腔内液体阻止了脂肪垫的侵入。踝关节运动期间脂肪垫进出滑囊的滑动运动使得跟腱能以更靠下且有利的方式插入跟骨。
