Gizli ve yetersizlik tipi femur boyun kırığı BT bulguları

Özet

Başlangıç grafileri normal olabilen gizli kırık, ilk radyografide görünmeyen kırığı; yetersizlik tipi femur boyun kırığı ise zayıflamış kemikte gelişen kırığı ifade eder. BT kortikal ve subkondral kemik bütünlüğünü ve ince kırık hatlarını gösterebilir; erken kemik iliği değişiklikleri MRG'de daha duyarlıdır. Grafiler normal olsa da kalça ağrısı sürüyorsa MRG tercih edilen sonraki incelemedir; BT erken kemik iliği değişikliklerini göstermeyebilir. Femur boyun stres kırığında tanı gecikmesi, kırığın yer değiştirmesi ve damar hasarı riskini artırabilir.

Faz ve pencere

Kontrastsız tanısal: Femur boynunda ince kırık hattı aranır; BT kortikal ve subkondral kemik bütünlüğünü değerlendirip ince kırık hatlarını gösterebilir. BT ince kırık hatlarını ve sklerozu gösterebilir; kontrastlı MRG'de düşük sinyalli bandın proksimalindeki kemik segmentinin kontrastlanması, SIF ile osteonekroz ayrımına yardımcı olur.
Kemik algoritması tanısal: BT kortikal ve subkondral kemik bütünlüğünü ve ince kırık hatlarını değerlendirmede yararlıdır; erken kemik iliği değişiklikleri için MRG daha duyarlıdır. BT'nin negatif olması erken kemik iliği değişikliklerini dışlamaz; MRG bu değişiklikleri göstermede daha duyarlıdır.

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

BT bulguları

İnce kortikal kesinti — femur boynunun superior veya inferior korteksinde kısa çizgisel açıklık.
Trabeküler impaksiyon — boyun trabeküllerinde fokal yoğunlaşma ve ince çizgisel deformasyon.
Subkapital kırık hattı — femur başı-boyun bileşkesinin hemen altında kesinti veya basamaklanma.
Sklerotik iyileşme bandı — özellikle gecikmiş/yetersizlik tipi kırıkta boyun içinde sınırlı yoğun çizgi.
Hafif deplasman — femur başı-boyun ekseninde açılanma, kortikal basamak veya kırık aralığı.
Eşlik eden eklem efüzyonu — kapsül distansiyonu olabilir; tek başına kırık kanıtı değildir.
MRG gerektiren BT-negatif durum — klinik şüphe sürerken belirgin kortikal hat görülmemesi kırığı dışlamaz; ödem ve trabeküler yaralanma MRG'de değerlendirilir.

Normalde

Normal femur boynunda superior ve inferior korteks kesintisizdir; trabeküler yapı baş-boyun ekseninde düzenli ve kırık basamağı olmaksızın izlenir. Aynı koronal eğik düzeyde karşı taraf korteksini referans alıp fokal çizgisel yoğunlaşma, kontur kırılması ve boyun eksenindeki açılanmayı arayın.

Normal BT ile kıyasla

Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.

Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s1256; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Femur boyun stres kırığı: tekrarlayan yüklenme bağlamında superior tensiyon veya inferior kompresyon tarafında gelişir.
Femur başı osteonekrozu: subkondral baş bölgesinde sklerotik sınır ve kontur çökmesi olabilir; boyun korteksinde çizgisel kırık beklenmez.
Osteoartrit: eklem aralığı daralması, osteofit ve subkondral kistler kronik eklem kenarlarında bulunur.
Normal trabeküler varyant: çizgiler karşı tarafta da benzer sürer ve kortikal kesinti/deformasyon yapmaz.
Yetersizlik tipi sakral/pelvik kırık: iliak kemik ya da sakrumda bulunur, femur boyun korteksi korunur.

Tuzaklar

BT'de kırık hattı görünmüyor diye devam eden kalça ağrısını açıklamasız bırakmayın; meta-analizlerde yalancı negatif BT bildirilmiştir ve persistan şüphede MRG gereklidir.
Sklerotik çizgi ve kalüs oluşumu kırığın kronikleştiğini düşündürebilir; akut ödemi ayırt etmek için MRG ödem bulgularını da değerlendirmelidir.
Küçük boyun impaksiyonunu yalnız aksiyel planda aramayın; femur boynuna paralel koronal eğik rekonstrüksiyon çizgiyi daha görünür kılabilir.

Kendini dene

Düşme sonrası grafi ve BT'de belirgin kırık yok; hasta yük veremiyor ve femur boynu üzerinde hassas. Hangi inceleme kemik iliği ödemini göstermek için uygundur?
Cevabı göster
Kalça MRG. MRG, BT’de görünmeyebilen kemik iliği ödemi ve subkortikal kırık hatlarını gösterir; erken evrede kemik iliği ve subkortikal değişiklikleri en belirgin biçimde ortaya koyan ve ayırıcı tanıda yüksek özgüllük sağlayan ilk tercih görüntülemedir. Kontrastlı BT ve anjiyografi bu soruyu çözmez; ultrason kemik iliğini değerlendiremez.
Zayıflamış kemikte olağan yük altında gelişen kırık hangi adla tanımlanır?
Cevabı göster
Yetersizlik kırığı. Yetersizlik kırığı, osteoporoz gibi nedenlerle zayıflamış kemikte gelişir; yorgunluk kırığı ise sağlıklı kemiğe tekrarlayan yük binmesiyle oluşur.

İlgili konular

Femur boyun stres kırığı

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 10 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.