Journal of Korean Society of Medical Ultrasound 1997;16(4): 401-405.
Normal Sonographic Appearance of Synovial Fluid in the Ankle.
Hae Jong Jung, Ho Kyoung Lee, Dong Joon Youk, Taek Soo Rho, Min Jin Lee, Sang Chun Lee
Department of Radiology, Seoul Red Cross Hospital.
  Published online: January 1, 2001.
ABSTRACT
PURPOSE: To evaluated synovial fluid in ankle joint in asymptomatic volunteers with ultrasonography, We described its existence and amount. MATERIALS and METHODS: Eighty ankles in forty asymptomatic volunteers were imaged by using a 5-10 MHz linear array US transducer in both supine and prone positions. Fluid was measured in the ankle joint recesses, in the retrocalcaneal bursa and around the tibialis posterior, flexor digitorum longus, flexor hallucis longus, peroneus longus, peroneus brevis, and tibialis anterior tendons. RESULTS: Fluid was detected in the anterior recess of the ankle joint in 65% (52 ankles in 80 ankles). The mean AP diameter is 0.27cm and mean longitudinal diameter is 0.46cm. Retrocalcaneal bursa fluid was found in 80% (64 in 80 ankles). The mean AP diameter is 0.12 cm and mean longitudinal diameter is 0.53 cm. There is no fluid in posterior recess and around the tendon sheath. CONCLUSION: US of the ankle commonly depicts articular and bursal fluid in asymptomatic volunteers. The presence of fluid in these location does not necessarily imply underlying abnormality.
Keywords: Ankle; Joint; Fluid; Bursa; Tendons; US
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