Özet
Aksiyel yükün eklem yüzüne aktarılması, lateral veya daha seyrek medial plato altında trabeküler impaksiyon ve yüzey çökmesi oluşturabilir. Kontrastsız BT, subkondral plağın basamaklandığı alanı, çökme dağılımını ve eşlik eden kortikal split ya da posterior kolon uzanımını gösterir. Depresyonun gerçek eklem yüzüyle ilişkisi çok düzlemli rekonstrüksiyonlarda daha anlaşılır; yumuşak doku penceresi hemartroz içindeki yağ-kan seviyesini ortaya çıkarabilir. Tibia platosu kırıklarında posterior eklem yüzü çökmesi gözden kaçabilir ve bu bulgunun sıklığı olduğundan düşük tahmin edilebilir.
Okuma sırası
- Subkondral plato yüzeyi. Koronal BT görüntüsünde plato eklem yüzündeki depresyonun yerini belirleyin.
- Eklem yüzü basamağı. Depresyonun yeri ve derinliği, koronal düzlemde sağlam komşu plato yüzeyiyle karşılaştırılarak ve çok düzlemli BT ile doğrulanır.
- Depresyonun posterior sınırı. Aksiyel ve sagittal görüntülere geçip impaksiyonun ön-arka uzunluğunu ve posterior kortekse uzanıp uzanmadığını belirleyin.
- Eşlik eden kırıklar ve suprapatellar reses. Son taramada periferik split, tibial eminens veya fibula başı kırığını ve suprapatellar yağ-kan seviyesini ayrı ayrı arayın.
Bu konu için açık lisanslı ve doğrulanmış bir olgu görüntüsü henüz bulunamadı.
Faz ve pencere
- Kontrastsız tanısal
- BT, plato depresyonunu ve posterolateral korteks bütünlüğünü değerlendirmede kullanılabilir.
Önerilen pencereler G genişlik, M merkez; değerler Hounsfield birimi (HU)
- KemikG 1800 / M +400
- Yumuşak dokuG 400 / M +40
BT bulguları
- Depresyon kırıklarında çöken eklem yüzünün altında subkondral kemik defekti bulunabilir.
- Artiküler basamak — normal pürüzsüz plato konturu fokal çökme ile kesilir; koronal düzlem medial-lateral yükseklik farkını gösterir.
- Depresyonun sınırları — çökmüş yüzeyin anterior-posterior yayılımı aksiyel ve sagittal rekonstrüksiyonlarla belirlenir.
- Split eşliği — periferik kortikal ayrışma, impakte eklem yüzü fragmanının yanında ikinci bileşen olarak bulunabilir.
- Posterior uzanım — çöken alan arka kondil veya posterior kortekse ulaşabilir ve tek koronal görüntüde küçümsenebilir.
- Lipohemartroz — suprapatellar kesede yağ-kan seviyelenmesi intraartiküler kemik yaralanmasını destekler.
- Kondiler eşlikçiler — diğer plato, tibial eminens ve fibula başında ayrı kırık ya da avulsiyon aranır.
Ölçütler ve sınıflamalar
- Schatzker
- BT’de gizli lateral kortikal split ve posterior/kolon uzanımı ortaya çıkabileceğinden, tip etiketine ek olarak depresyonun yerini ve split/arka kolon morfolojisini ayrıca tarif edin.
Normalde
Tibia platosu depresyonunun kapsamı BT'nin aksiyel, koronal ve sagittal kesitlerinde değerlendirilebilir. Depresyonun derinliği BT ölçümlerinde hesaplanabilir.
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 s0685; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.
Ayırıcı tanı
- Lateral split kırığı
- dış korteksten eklem yüzüne uzanan ayrık kondiler kama, depresyondan bağımsız olarak seçilir.
- Subkondral skleroz
- yaygın veya kronik yoğunluk artışı oluşturur; akut plato kontur basamağı ve hemartroz eşlik etmeyebilir.
- Osteokondral yaralanma
- eklem kıkırdağı ile altındaki subkondral kemik birlikte etkilenebilir.
- Tibial plato stres/insufficiency kırığı
- eklem altı ince kırık hattı ve trabeküler değişiklik yapabilir; travmatik kondiler parçalanma olmayabilir.
Tuzaklar
- Schatzker tip IV kırıklarında posterior eklem yüzü depresyonu görülebilir ve sıklığı olduğundan düşük tahmin edilebilir; bu nedenle posterior eklem yüzünü BT’de özellikle değerlendirin.
- Kemik penceresinde belirgin olmayan eklem içi yağ-kan seviyesi, yalnız eklem efüzyonu sanılabilir; yumuşak doku penceresinde sıvı katmanlarını kontrol edin.
- Plato çökme kırığında eklem yüzü depresyonunu ve posterolateral korteks bütünlüğünü BT’de birlikte değerlendirin; korteks sağlam olabilir ya da kırık olabilir.
Kendini dene
Schatzker tip IV kırıklarının BT morfoloji çalışmasında eklem yüzü depresyonu için hangi ölçüm yapılmıştır?
Cevabı göster
Eklem yüzü depresyonunun derinliği. BT morfoloji çalışmasında eklem yüzü depresyon derinliği hesaplanmıştır.
Plato kırığı olan hastada suprapatellar kesede yağın kan üzerinde katmanlandığı görülüyor. Bu bulgu en iyi neyi destekler?
Cevabı göster
İntraartiküler kırık. Eklem içindeki yağ-kan seviyelenmesi lipohemartrozdur ve kemik iliği yağı eklem boşluğuna geçtiği için intraartiküler kırığı destekler. Baker kisti posterior yumuşak doku koleksiyonudur; tendon yırtığı veya ekstraartiküler hematom böyle katman oluşturmaz.
İlgili konular
Kaynaklar
Bu sayfadaki 34 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 6 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.