The tendon is a densely packed connective tissue structure consisting of type I collagen fibrils embedded in a matrix of proteoglycans. Tendons are relatively hypovascular but the predominant cell is the fibroblast, or tenocyte. Tenocytes are responsible for producing and maintaining a healthy matrix. Collagen fibrils are arranged in closely packed bundles to form fascicles. Tendons that move in a straight line, such as the Achilles tendon, are surrounded by loose areolar connective tissue called the “paratenon”. The paratenon is usually not visible on imaging studies unless it is surrounded by fluid on both sides. Tendons that bend sharply around corners, such as the long flexors of the foot, are subject to compressive forces and are enclosed by a tendon sheath. Tendons sheaths are lubricated by synovial fluid in order to reduce friction [1, 2].
KeywordsAchilles Tendon Tendon Sheath Magnetic Resonance Arthrography Subtalar Joint Plantar Fascia
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