Oct 27, 2024 · Atlanto-dental interval (ADI) The atlantodental interval is used in the diagnosis of atlanto-occipital dissociation injuries and injuries of the atlas and axis. On this page:

Anterior translation of C1 with atlantodental joint space (ADI) widening and anterior offset of the posterior tubercle relative to the expected spinolaminar line alignment.

Sep 24, 2024 · Terminology. Antlanto-axial rotary fixation is the preferred term as fixation occurs usually within the normal range of motion of the joint and subluxation or dislocation are not always present 8.Further, a normal range of motion includes atlantoaxial rotation up to 79 degrees, asymmetry of the lateral masses of C1 and the dens, and …

Mar 21, 2021 · The paraodontoid space and/or lateral mass overhang distance may be measured, however lateral mass overhang is favored as it is less subject to projectional distortion from head rotation 2. 1-2 mm of lateral mass overhang may be normal with lateral bending open mouth radiographs, thus measurements in excess of 2 mm should be considered ...

Apr 27, 2023 · The retrotracheal space (or Raider triangle) is a radiolucent mediastinal space best seen on lateral chest x-rays. It is normally triangular in shape but can vary greatly in size and shape depending on the patient's body habitus and lung volume 1.

Dec 15, 2021 · acromioclavicular (AC) joint space: 1-7 mm 4 (narrower in the elderly) increased: AC joint separation, clavicular erosion/absorption; decreased: degenerative joint disease; acromiohumeral interval/space: 7-11 mm (or 8-12 mm 3) increased: subluxation, dislocation; decreased: rotator cuff tear; coracoclavicular distance/space: 11-13 mm

Apr 5, 2022 · The basion-dens interval (BDI) is the distance between the basion and the tip of the dens, used in the diagnosis of atlanto-occipital dissociation injuries.. It is the distance from the most inferior portion of the basion to the closest point of the superior aspect of the dens in the median (midsagittal) plane.

Feb 9, 2025 · rheumatoid arthritis: CT/MRI will show atlantooccipital instability due to pannus destabilisation of joints and ligaments, and x-ray will show erosions

Jan 12, 2025 · The medial clear space is a radiographic measurement that may be useful in the diagnosis of ankle instability, syndesmotic injuries and ankle fractures 5.

Mar 7, 2025 · Plain radiography is insensitive to the early changes of spondylodiscitis, with normal appearances being maintained for up to 2-4 weeks. Thereafter disc space narrowing and irregularity or ill definition of the vertebral endplates can be seen. In untreated cases, bony sclerosis may begin to appear in 10-12 weeks. CT