Fusion von Os capitatum und Os trapezoideum

Karpale
Koalition Os capitatum und Os trapezoideum (distale Radiusfraktur)
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Carpal
coalition: 4 cases of a rare bony coalition between the capitate and trapezoid bone, with MRI findings in a symptomatic case.. (A) Plain radiography. (B) Coronal SE T2-WI FS. Carpal coalition with complete osseous bridging. No adjacent bone marrow oedema.
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Carpal
coalition: 4 cases of a rare bony coalition between the capitate and trapezoid bone, with MRI findings in a symptomatic case.. (A-B) 38-year-old female (patient 3) with isolated CTC. Incomplete osseous fusion with distal joint space remnant (Minnaar type 2). (C-D) 63-year-old male (patient 4) with combined capitate-hamate (large arrows) and capitate-trapezoid (small arrows) coalition.
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Karpale
Koalition zwischen Capitatum und Trapezoideum als Zufallsbefund im Rahmen der Diagnostik einer distalen Radiusfraktur: Links Röntgenbild in der Schiene, Mitte Computertomografie in koronarer Rekonstruktion, rechts Volumen Rendering. Zusätzlich scheint ein karpales Bossing im 3. Strahl vorzuliegen.
Wikipedia • CC BY-SA 4.0
Karpale
Koalition: Hier seltener Fall einer Fusion von Os capitatum und Os trapezoideum. Ob die Fusion komplett knöchern ist, kann anhand dieser einen Aufnahme nicht sicher entschieden werden. Zufallsbefund bei Frakturausschluss.
Wikipedia • CC BY-SA 3.0
Partielle
aber wohl ossäre karpale Koalition zwischen Os capitatum und Os trapezoideum in der CT und im Röntgenbild. DD erscheint die Verschmälerung zwischen den Knochen aufgrund von Arthrose nicht wahrscheinlich, das keine sonstigen Veränderungen in die Richtung deuten.
Wikipedia • CC BY-SA 3.0
Carpal
coalition: 4 cases of a rare bony coalition between the capitate and trapezoid bone, with MRI findings in a symptomatic case.. (A) Narrowed CTJ with irregular, sclerotic margins (arrow). (B) CTJ filled with fibrovascular tissue (long arrow), (B-E) There is a surrounding bone marrow oedema, presence of subchondral cysts and the margins are irregular (short arrows).
www.eurorad.org • CC by-nc-sa-4.0
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Fusion von Os capitatum und Os trapezoideum

Karpale Koalition Radiopaedia • CC-by-nc-sa 3.0 • de

Carpal coalition refers to failure of separation of two or more carpal bones, and although the most commonly involved bones are the lunate and triquetrum, most combinations of adjacent bones can be found to be coalesced.

Terminology

Carpal fusion is a misnomer, as it is the failure of normal segmentation of carpal mesenchyme that results in the anomaly . Carpal coalition is less contentious as its definition means a connection between two bones, it says nothing about how they came to be connected .

Epidemiology

The estimated prevalence is ~0.1% in Caucasian Americans and ~1.5% in African Americans, and it tends to affect women more commonly .

Associations

There are several associated conditions, especially with multiple coalitions:

Pathology

As with tarsal coalition, congenital carpal coalition can either be osseous (synostosis), cartilaginous (synchondrosis), or fibrous (syndesmosis).

Etiology

Non-syndromic congenital carpal coalition is transmitted via a Mendelian inheritance pattern. Acquired intercarpal fusion can either be a consequence of an inflammatory arthropathy (e.g. rheumatoid arthritis, psoriatic arthritis, reactive arthritis) or injury, or due to intentional surgical arthrodesis.

Types

The two most common types are:

Siehe auch:
Assoziationen und Differentialdiagnosen zu Fusion von Os capitatum und Os trapezoideum: