Travmatik kemik kanal basısı

Özet

Yüksek enerjili servikal travmada korpusun posterior duvarı veya posterior elemanlardan kopan kemik parçası kanala ilerleyebilir. İnce kesit kontrastsız BT, fragmanın kaynağını, yönünü ve kanal konturuna etkisini hızlı biçimde ortaya koyar. BT kemik kanal daralmasını ve travmanın kemik morfolojisini gösterir; spinal kord yaralanmalarının değerlendirilmesinde MR ek bilgi sağlar. Bası ve eşlik eden kırık örüntüsü atlanırsa instabilite ile nörolojik yaralanmanın anatomik zemini eksik raporlanabilir.

Faz ve pencere

Kontrastsız tanısal

Posterior korpus duvarından kanala doğru yer değiştiren yüksek dansiteli kemik fragmanı, lamina ya da faset parçası ve kanalın kemik sınırındaki daralma izlenir; intravenöz kontrast gerekmez.

Kemik algoritması tanısal

Aksiyel kesitler fragmanın kanal içindeki izdüşümünü; sagittal ve koronal rekonstrüksiyonlar kırık hattının vertebra ve posterior elemanlar boyunca devamını gösterir.

Önerilen pencereler: Kemik (G 1800 / M 400), Yumuşak doku (G 400 / M 40).

BT bulguları

• Retropulsiyon — vertebra korpusunun kırılmış posterior duvarından kemik parça spinal kanala doğru yer değiştirir.
• Kanal konturunda fokal daralma — fragmanın olduğu seviyede kemik kanalın ön-arka çapı veya kesitsel alanı komşu seviyeye göre azalır.
• Posterior eleman fragmanı — lamina, faset ya da spinöz çıkıntı parçası kanalın arka veya yan sınırına uzanabilir.
• Kırık hattı devamlılığı — sagital rekonstrüksiyonda korpus kırığı endplate ve posterior kortekse kadar izlenebilir.
• Burst kırığında kemik fragmanları spinal kanala uzanabilir ve ciddi nöral hasarla ilişkili olabilir.
• Eşlik eden hizalanma kaybı — translasyon, segmental kifoz veya faset kilitlenmesi kemik basısına eşlik edebilir.
• Kord dokusu sınırı — BT kemik fragmanı ve kanal geometrisini gösterir, kord ödemi ya da kontüzyonunu güvenle dışlamaz.

Normalde

Normal servikal kanalda korpusların posterior korteksi düzgün bir ön sınır, laminalar ve ligamentöz ark ise arka sınırı oluşturur; kanal boyunca kemik konturunda ani çıkıntı bulunmaz. Yaralı seviyeyi üst ve alt komşu seviyelerle, mümkünse karşı taraf faset ve lamina konturlarıyla kıyaslayıp daralmanın fragmanla aynı noktada olup olmadığını izleyin.

Ayırıcı tanı

Kronik kanal darlığı

çok seviyeli dejeneratif kemik çıkıntıları ve faset hipertrofisi yapar; travmatik odak fragman gibi görünmez.

Gelişimsel dar kanal

birden çok seviyede kanal darlığı görülebilir; travmatik retropulsiyon ise posterior kortekse uzanan kırık hattı ve kanala yer değiştirmiş kemik fragmanlarıyla tanımlanır.

Tuzaklar

• Kanal daralmasını yalnız tek aksiyel görüntüde ölçüp kırık hattını kaçırma; fragmanın korpustan mı fasetten mi geldiğini sagittal ve koronal planda izle.
• Kanal içindeki kemik parçanın varlığını kord yaralanmasının derecesi gibi sunma; BT yumuşak kord dokusunu yeterince karakterize etmez.
• Küçük retropulse fragmanı osteofit sanma; akut kırık kenarı keskin ve düzensiz olabilir, komşu kortekste de kesinti aranır.

Kendini dene

1. Travma BT'sinde C5 posterior korpus korteksinden kanala uzanan keskin fragman görülüyor. En doğru yorum hangisidir?

   • Travmatik retropulsiyon
   • Kronik osteofit
   • Gelişimsel kanal darlığı
   • Epidural hematom
   Cevabı göster

   Travmatik retropulsiyon. Posterior korteks kırığıyla süreklilik gösteren keskin kemik parça akut retropulsiyonu destekler. Osteofit kortike ve kronik gelişimlidir; gelişimsel darlık fragman yaratmaz, hematom ise kemik dansitesinde olmaz.

2. Kemik fragmanı kanalı daraltıyor; hasta kol güçsüzlüğü tarif ediyor. BT kordun durumunu nasıl belirler?

   • Kord hasarını kesinleştirir
   • Kord hasarını dışlar
   • Kemik basısını gösterir
   • Bağ yırtığını dereceler
   Cevabı göster

   Kemik basısını gösterir. BT kemik fragmanı ve kanal geometrisini gösterir; kord kontüzyonu ve ödemi değerlendirmede MR gerekir. Bası varlığı tek başına kord hasarını kesinleştirmez veya dışlamaz, bağ yırtığını da doğrudan derecelemez.

İlgili konular

• Diskoligamentöz yaralanma (BT dolaylı bulguları)
• Ankilozan spondilit/DISH zemininde servikal kırık

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 1 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez, tıbbi tavsiye değildir. Metinler yapay zekâ desteğiyle yazıldı ve otomatik bir adımda kaynak alıntılarıyla karşılaştırıldı; bu bir tıbbi doğrulama değildir ve içerik uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.