Çok seviyeli ve ardışık olmayan omurga kırıkları

Özet

Travma sonrası saptanan bir vertebra kırığı, özellikle ankilozan spondilit veya DISH nedeniyle rijit omurgası olan hastada, ikinci ve birbirinden uzak kırık olasılığını gündeme getirir. Tüm omurganın BT'si kemik ayrıntısını ve kırık seviyeleri arasındaki mesafeyi gösterir; sagittal ve koronal MPR hizalanmayı ve atlanan kırık çizgilerini taramayı kolaylaştırır. Ağrı yeri ek kırık seviyesini güvenilir biçimde göstermeyebilir ve ankilozlu segment uzun kaldıraç kolu gibi davranır. İkinci instabil kırığın atlanması deplasman ve nörolojik kötüleşmeye yol açabilir.

Faz ve pencere

Kontrastsız tanısal

Görüntülenen tüm omurga boyunca vertebra korpusları, disk aralıkları ve posterior elemanlarda akut kortikal kırık, transdiscal hat, deplasman ve ankilozlu segmentte kesinti araştırılır. Sagittal ve koronal ince kesit MPR hizalanmayı ve kırık uzanımını gösterir; aksiyel kesitler pedikül, faset ve posterior eleman tutulumunu tamamlar.

Önerilen pencereler: Kemik (G 1800 / M 400).

BT bulguları

• Ayrık kırık odakları — aynı omurga içinde arada sağlam vertebralar bulunan birden çok kırık alanı olabilir.
• Ankilozlu segmentte transvers hat — füze olmuş disk, faset veya uzun kemiksi köprü boyunca geçen kesinti, küçük travmada bile önemli bir yaralanma olabilir.
• Üç kolon boyunca devamlılık — kırık hattının ön korpus/osteofitlerden posterior elemanlara uzanması instabil yaralanma morfolojisini gösterir.
• Ağrı düzeyiyle uyumsuz kırık — semptomatik bölgeden uzakta ek kırık bulunabileceği için yalnız ağrı noktasına yönelik kesitler yeterli tarama sayılmaz.
• Korpus basamağı veya açılanma — sagittal profilde posterior duvar retropulsiyonu, kifotik deformite ya da translasyon eşlik edebilir.
• Gövde ve/veya posterior elemanlarda kırık — Ankilozlu omurgada yaralanma hatları disk, gövde ve posterior elemanları tek başına veya birlikte tutabilir.
• Sakrum ve servikotorasik bileşke — taranan tüm omurga boyunca torakolomber odaktan uzak bölgelerde de ikinci yaralanma aranır.

Normalde

Normal omurga ve ankiloz karşılaştırması — Normal omurgada vertebra korpusları ve disk aralıkları belirgindir; DISH'li hastalarda ise komşu vertebra gövdeleri arasında neredeyse normal disk yüksekliğinde kemik köprüleri izlenir. Şüpheli seviyeyi komşu sağlam diskler, korpuslar ve fasetlerle kıyaslayıp kortikal çizgi kesintisi, yeni basamaklanma ve ayrı ikinci odak arayın.

Ayırıcı tanı

Dejeneratif osteofit kırığı

ön osteofitte ince kopma çizgisi olabilir; vertebra korpusu ve posterior elemanlarda devam eden instabil hat bulunmayabilir.

Ankilozan spondilit spondilodiskiti

disk aralığı ve endplate erozyonu kronik inflamatuvar değişikliklerle ilişkili olabilir; akut travmatik kortikal basamaklanmayla aynı değildir.

Eski kompresyon deformitesi

MR, akut kırıkları kronik deformitelerden ayırmada temel görüntüleme yöntemlerinden biridir.

Schmorl nodu

endplate içine sınırlı fokal çökme yapar; vertebra boyunca uzanan transvers kırık hattı değildir.

Kemik adacığı veya benign sklerotik odak

medüller yerleşimli, düzgün sınırlı yoğunluk artışıdır; kortikal süreksizlik ve hizalanma bozukluğu yaratmaz.

Tuzaklar

• Ağrının olduğu tek seviyeye odaklanmak ikinci kırığı kaçırabilir; doğrulanmış bir spinal kolon kırığından sonra geri kalan omurgayı da inceleyin.
• Ankilozlu omurgadaki ince transdiscal çizgiyi dejeneratif değişiklik sanmayın; kemik köprü ve posterior eleman boyunca devamlılığını çok düzlemli izleyin.
• Kısmi tarama alanı tüm omurga değerlendirmesi yerine geçmez; travma BT'sindeki görüntülenen bölümlerle birlikte eksik kalan segmentleri saptayın.
• BT'de kırık görünmemesi omurilik veya bağ yaralanmasını bütünüyle dışlamaz; nörolojik bulgu ya da klinik-görüntüleme uyumsuzluğu varsa MR'ın rolü vardır.

Kendini dene

1. Minör travma sonrası DISH'li hastada T12 kırığı saptanıyor; bel ağrısı var. Görüntüleme taraması nasıl tamamlanmalı?

   • Omurganın geri kalanını görüntüle
   • Yalnız T12'yi yeniden kur
   • Sadece lomber MR çek
   • Toraks grafisiyle yetin
   Cevabı göster

   Omurganın geri kalanını görüntüle. Ankilozan omurga kırıklarında çok seviyeli ve ağrıdan uzak yaralanma olasılığı artar. Kırık doğrulanınca geri kalan spinal kolon da değerlendirilmelidir; odaklı tekrar, yalnız MR veya grafi tüm omurgadaki kemik kırık taramasının yerini tutmaz.

2. Sagittal BT'de T8'de transdiscal çizgi ve L1'de ayrı posterior eleman kırığı görülüyor. Bu iki odağı nasıl adlandırırsınız?

   • Çok seviyeli ayrık yaralanma
   • Tek düzey kompresyon
   • Disk vakum fenomeni
   • Gelişimsel blok vertebra
   Cevabı göster

   Çok seviyeli ayrık yaralanma. Birbirinden uzak seviyelerde iki ayrı kırık çok seviyeli ve nonkontigu yaralanmadır. Ankilozan omurgada izole basit kompresyon yaralanması olasılığı düşüktür; verilen kaynaklar vakum fenomeni veya blok vertebranın tanımını doğrulamıyor.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 4 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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