Tibia şaft kırığı

Özet

Tibia şaft kırıkları trafik kazaları ve yüksek enerjili mekanizmalar sonucu sık görülür; eksternal rotasyon kuvveti spiral kırık oluşumuyla ilişkilidir. BT, kompleks kırık morfolojisini ve grafide kuşkulu metafizer/eklem uzanımını haritalamada; distal spiral kırığa eşlik edebilecek arka malleol kırığını saptamada yararlıdır. Spiral tibia kırıklarında eşlik eden ayak bileği ve fibula yaralanmalarını saptamak amacıyla BT incelemesi distal eklem yüzlerini kapsayacak şekilde planlanmalıdır. Parçalı veya ekleme uzanan bileşenin atlanması hizalanma değerlendirmesini ve eşlik eden yaralanmaların tanınmasını güçleştirir.

Faz ve pencere

Kontrastsız tanısal

Tibia şaft kırığının morfolojisi ve eşlik eden ayak bileği çevresi kırıkları BT ile değerlendirilebilir.

Kemik algoritması tanısal

İnce kesitli multidetektör kemik pencere BT, spiral kırık hattının eklem yüzlerine uzanımını ve eşlik eden distal yaralanmaları tanımlamada temel yöntemdir.

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

BT bulguları

• Kırık seviyesi — proksimal, orta veya distal diyafiz olarak tibia boyunca yerini tarif et.
• Kırık morfolojisi — transvers, oblik, spiral veya parçalı hat ile kama fragmanını ayırt et.
• Deplasman ve hizalanma — kortikal basamak, translasyon, angulasyon, rotasyon ve kısalmayı çok düzlemli rekonstrüksiyonlarda değerlendir.
• Eklem uzanımı — özellikle distal diyafiz kırıklarında tibial plafond ve çevresindeki malleol yapılarıyla bağlantılı ince hattı ara.
• Eşlik eden fibula kırığı — aynı ya da farklı seviyedeki fibula kırığının varlığını, paternini ve tibia ile olan uzamsal ilişkisini kaydet.
• Yumuşak doku — hematom, belirgin ödem, açık yara ile ilişkili hava ve yabancı cisim varlığını incele.

Ölçütler ve sınıflamalar

AO/OTA 42 diyafiz sınıflaması

42A basit kırık (spiral, oblik veya transvers alt tip); 42B kama tipi; 42C çok parçalı tiptir. AO/OTA sınıflaması, kırığın morfolojisine göre basit (42A), kama (42B) veya çok parçalı (42C) olarak sınıflandırılmasını tanımlar.

Normalde

Normal diyafizde tibia korteksi kesintisiz ve düzgün kalınlıkta, medüller kanal ise kemik konturu içinde devamlı görünür; fibula tibianın posterolateralinde ayrı bir kemik olarak izlenir. Çok düzlemli BT ile kırık segmentlerinin eksenel hizası, rotasyon sapması, translasyonu ve kısa mesafe kaybı niceliksel olarak ölçülür.

Ayırıcı tanı

Tibia stres kırığı

kortekste sınırlı ince hat ve periostal/endosteal yeniden şekillenme görülür; akut travmatik deplasman beklenmez.

Tibial plato kırıkları, proksimal tibia metafizi ve eklem yüzünü içeren kompleks kırıklardır ve Schatzker sınıflamasına göre değerlendirilir.

Besleyici kanal

uzun kemiklerde travmatik kırık hattı ile karışabilen oblik radyolüsent hat oluşturur; tanısal eminlik için karşı taraf veya BT ile doğrulanmalıdır.

Patolojik kırık

kırık hattı öncesinde litik veya sklerotik odak, kortikal incelme ya da kemik dışı kitle eşlik edebilir.

Tuzaklar

• Tek aksiyel kesitte küçük görünen oblik hat, ardışık koronal ve sagittal görüntülerde uzun bir spiral kırık oluşturabilir.
• Distal diyafiz spiral kırığı, tibial plafond veya arka malleol uzanımı eşlik edebildiğinden ayak bileği seviyesine kadar izlenmelidir.
• Travma sonrası yumuşak doku amfizemi nekrotizan yumuşak doku enfeksiyonuna benzeyebilir; tek başına enfeksiyonu göstermez.

Kendini dene

1. Burulma sonrası tibia orta diyafizinde spiral kırık ve kama ara fragmanı görülüyor; redüksiyon sonrası iki ana fragman arasında kortikal temas sürüyor. En uygun AO/OTA morfoloji grubu hangisidir?

   • 42A basit
   • 42B kama
   • 42C çok parçalı
   • Tibial plato kırığı
   Cevabı göster

   42B kama. Kama ara fragmanı bulunan ve redüksiyon sonrası proksimal-distal ana fragmanlar arasında temasın sürdüğü örüntü 42B kama kırığıdır. 42A basit kırıkta ara fragman yoktur; 42C çok parçalı/kompleks kırık örüntüsüdür. Plato kırığı eklem metafizini tarif eder.

2. Distal tibia spiral kırığında eklem yüzüne uzanımın en iyi arandığı inceleme hangisidir?

   • Kontrastsız ince kesit BT
   • Arteriyel faz BT
   • Gecikmiş faz BT
   • HRCT
   Cevabı göster

   Kontrastsız ince kesit BT. Kontrastsız ince kesit kemik rekonstrüksiyonları kortikal hattı ve plafond uzanımını gösterir. Arteriyel ve gecikmiş fazlar kemik hattını göstermek için gerekli değildir; HRCT akciğer incelemesine özgüdür.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 12 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.