the technique below demonstrates how to identify normal anatomy. remember to assess all 2022年世界杯预选赛规则图解
anatomy dynamically and thoroughly.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\n\t\t\t\t\t\t
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<\/span>divide the knee into 4 compartments.<\/span><\/span><\/h2>
the primary structures to examine anteriorly are:<\/p>
the quadricep muscles and tendon.\u00a0<\/strong><\/p>
comprised of:<\/p>
rectus femoris (central and most superficial)<\/span><\/li>
vastus medialis (medial)<\/span><\/li>
vastus lateralis (lateral)<\/span><\/li>
vastus intermedius (deep to rectus femoris)<\/span><\/li><\/ol>
the tendons of these 4 muscles insert to the patella forming the quadricep tendon. the main central band of which is comprised of rectus femoris and vastus intermedius.<\/p>
there is also a fascial insertion to the medial and lateral patello-femoral retinaculae (advanced technique)<\/p>
the suprapatella recess (also called the suprapatellar bursa)<\/em><\/p>
this is a pouch-like extension of the joint capsule extending superiorly from under the patella base to lie in the fat pad deep to the quadricep tendon.<\/span><\/li><\/ul>
the pre-patella bursa<\/strong><\/p>
lies anterior to the apex (inferior) patella, overlying the patella tendon.<\/li><\/ul>
patella tendon (also called patella ligament and infrapatella tendon)<\/em><\/p>
runs in the midline from the apex of the patella to the tibial tuberosity.<\/span><\/li>
is a continuation of the quadricep tendon.<\/span><\/li><\/ul>
hoffa's fat pad (infrapatella fat pad)<\/em><\/p>
a large trapezoid fat pad that lies deep to the patella tendon.<\/p>anterior knee anatomy. ref anatomylearning.com<\/figcaption><\/figure>anterior knee anatomy sagittal slice. ref anatomylearning.com<\/figcaption><\/figure>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
supine with their knee slightly flexed. (support may be required)<\/span><\/li><\/ul>
or<\/span><\/p>
seated on the side of the bed, their foot on your knee.<\/span><\/li><\/ul>
tip: the second position allows for controlled dynamic assessment better than when supine.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
palpate the base (superior aspect) of the patella<\/span><\/li>
place the probe in a longitudinal plane over the patella base.<\/span><\/li>
slide medially and laterally to examine the width of the anatomy.<\/span><\/li><\/ul>
visualise the quadricep tendon, underlying fat pad, suprapatella joint recess and the femur.<\/p>
transverse<\/p>
place the probe in a transverse plane at the patella<\/span><\/li>
slide superiorly to the distal 1 third of the thigh.<\/span><\/li><\/ol>
visualise the quadricep muscle bellies and musculo-tendinous junctions. also the underlying fat pad, suprapatella joint recess and the femur.<\/p>
tip: if the patient can activate their quadriceps (pull knee flatter), a joint effusion may be more evident.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
normal ultrasound appearance of the anterior knee:<\/span><\/p>
quadricep tendon and suprapatellar recess<\/em><\/p>
transverse:<\/p>
as seen in the image below, the quadricep muscles should be clearly visible as independent structures. rectus femoris the most superficial, midline and ovoid. each should be hypoechoic with interspersed echogenic lines.<\/span><\/li>
closer to the patella, the quadricep tendon should be an echogenic flat oval with a hypoechoic underlying fat pad.<\/span><\/li>
no fluid, or only a thin trace should be visible in the normal patient.<\/span><\/li><\/ul>
longitudinal:<\/p>
the quadricep tendon should be echogenic, fibrillar and tight (if there is any knee flexion). it should taper towards the patella.<\/span><\/li><\/ul>
infrapatella tendon<\/em><\/span><\/p>
longitudinal: echogenic, homogeneous and fibrillar.<\/span><\/li>
transverse: specular and echogenic. approximately 3cm wide<\/span><\/li><\/ul>
hoffa's fat pad<\/em><\/p>
hypoechoic.<\/span><\/li>
slightly heterogeneous.<\/span><\/li>
low\/no vascularity on colour doppler.<\/span><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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is there any bony irregularity of the patella or femur?<\/span><\/li>
is there fluid in the suprapatella recess? if yes, simple or complex?<\/span><\/li>
is there synovial thickening +\/- vascularity of the suprapatella recess?<\/span><\/li>
is the patella tendon intact, homogeneous, avascular (it should be)? is it tight with 45degrees flexion?<\/span><\/li>
is hoffa's fat pad normal?<\/span><\/li><\/ol>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\n\t\t\t\t\t\t