Normal Interphalangeal Joint Space Size on Radiography
Normal interphalangeal joint space measures 1–2 mm on PA and lateral radiographs; deviations indicate arthritis, injury, or effusion.
Musculoskeletal
142 entries · Page 3 of 5
I
Normal Intertarsal Joint Space Size on Radiography
Normal intertarsal joint space measures 2.0–2.5 mm on radiography; deviations may indicate arthritis, ligamentous injury, or coalition.
J
Normal Johnson Angle Size on Radiography: Foot & Ankle
The normal Johnson angle measures 92° on AP mortise radiography, a key reference for assessing tibiotalar alignment and ankle pathology.
K
Normal Kager's Triangle Size on Radiography
Learn the normal radiographic appearance of Kager's triangle, a key fat-pad space on lateral ankle X-ray used to detect Achilles tendon pathology.
Normal Klaus Index Size on X-ray, CT & MRI
The normal Klaus Index measures >30 mm on lateral cervical imaging, helping clinicians detect basilar invagination on X-ray, CT, and MRI.
Normal Knee Joint Space Width on Radiography and MRI
Normal knee joint space width measures 3–5 mm on anteroposterior radiography, a key threshold for detecting cartilage loss and osteoarthritis.
L
Normal Lateral Acetabular Inclination Angle Size Radiography
Normal lateral acetabular inclination angle on AP radiography ranges 30–50°, a key measure for assessing hip joint congruency and stability.
Normal Lateral Recess Height Size on CT and MRI
Normal lateral recess height measures greater than 2 mm on CT and MRI; values at or below this threshold indicate stenosis requiring clinical correlation.
Normal Lateral Trochlear Inclination Size on MRI
Normal lateral trochlear inclination on MRI measures greater than 11°, a key threshold for assessing patellar instability and trochlear dysplasia.
Normal Lumbosacral Angle Size on X-ray, CT & MRI
The normal lumbosacral angle measures 26–57° on lateral imaging; deviations correlate with low back pain, spondylolisthesis, and altered spinal biomechanics.
Normal Lumbosacral Disc Angle Size on X-ray, CT & MRI
The normal lumbosacral disc angle measures 10–15° on lateral imaging; deviations may indicate spondylolisthesis, disc pathology, or postural malalignment.
Normal Lunotriquetral Angle Size on Radiography
The normal lunotriquetral angle measures 14° on lateral radiography, a key reference for diagnosing carpal instability and ligamentous injury.
M
Normal McGregor's Line Measurement: Radiography, CT, MRI
Normal McGregor's line measures less than 4.5 mm above the line, used to assess basilar invagination on lateral cervical imaging.
Normal McMurtry's Translation Index Size on Radiography
Normal McMurtry's Translation Index on PA wrist radiography ranges from 0.27–0.33, serving as a key measure of carpal translocation.
Normal Metacarpophalangeal Joint Space Size on Radiography
Normal metacarpophalangeal joint space measures 1–2 mm on PA and lateral radiographs — a key reference for detecting arthritis and joint disease.
Normal Metaphyseal-Diaphyseal Tibia Angle Size on Radiography
Normal metaphyseal-diaphyseal tibia angle is less than 11° on AP radiography, helping distinguish physiological bowing from pathological tibia vara.
Normal Metatarsophalangeal Angle Size on Radiography
Normal metatarsophalangeal angle values on weight-bearing AP radiography: <15° at the 1st MTP and <10° at the 5th MTP joint.
Normal Metatarsophalangeal Joint Space Size on Radiography
Normal metatarsophalangeal joint space measures 1–2 mm on radiography; values outside this range suggest arthritis, gout, or joint destruction.
Normal Modified Insall-Salvati Ratio Size on Radiography
The normal modified Insall-Salvati ratio is less than 2 on lateral knee radiography, a key measure for detecting patellar height abnormalities.
N
Normal Nattrass's Carpal Height Index Size on Radiography
Normal Nattrass's Index of Carpal Height on PA wrist radiography ranges from 1.52 to 1.62, a key metric for detecting carpal collapse.
P
Normal Patellar Nose Size on Radiography and MRI
Learn the normal patellar nose measurements on radiography and MRI, including key thresholds linked to patellar instability and chondral pathology.
Normal Patellar Tilt Angle: Radiography, CT & MRI
Normal patellar tilt angle is 20° on sunrise view; learn measurement technique and clinical significance on radiography, CT, and MRI.
Normal Patellofemoral Index Size on Radiography
The normal patellofemoral index on sunrise radiograph is less than 1.6, a key metric for diagnosing lateral patellar compression syndrome.
Normal Physiologic Periosteal Reaction Newborn Radiography
Normal physiologic periosteal reaction in newborns measures less than 2 mm on radiography and must be distinguished from pathologic periostitis.
Normal Physiologic Periosteal Reaction Newborn Radiography
Normal physiologic periosteal reaction in newborns measures less than 2 mm on radiography and must be distinguished from pathologic causes.
Normal Posterior Cruciate Ligament Thickness on MRI
Normal posterior cruciate ligament thickness on MRI measures less than 6 mm; values above this threshold suggest PCL pathology requiring further evaluation.
Normal Powers Index Cervical Size: X-Ray, CT & MRI
The normal Powers Index is less than 1 on lateral imaging; values ≥1 indicate atlantooccipital dislocation on X-ray, CT, or MRI.
Normal Pseudosubluxation Size on Cervical Spine Radiography
Normal cervical pseudosubluxation measures less than 3 mm at C3/C4 on lateral radiography, a key threshold for distinguishing physiologic from pathologic displacement.
Q
Normal Quadriceps Angle Size on X-ray, CT & MRI
Normal quadriceps (Q) angle of the knee measures 15–20° on radiography, CT, and MRI, with clinical relevance to patellar instability and tracking disorders.
R
Normal Radial Inclination Angle Size on Radiography
Normal radial inclination on posteroanterior wrist radiography measures 21–25°, a key parameter for assessing distal radius fractures and alignment.
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