Ön Çapraz Bağ Rekonstrüksiyonunda Kemik Tendon İyileşmesi
Özet
Ön çapraz bağ (ÖÇB) yaralanmaları, diz ekleminin stabilizasyonunu bozarak sosyal ve ekonomik kayıplara yol açan, tünel içinde tendonun kemiğe iyileşme süreci nedeniyle rehabilitasyon aşamaları titizlikle yönetilmesi gereken önemli bir halk sağlığı sorunudur. Tedavide yaygın olarak tercih edilen kemik-patellar tendon-kemik (K-PT-K) otogreftleri, kemik blokları sayesinde tünel içinde daha kısa sürede iyileşerek erken rehabilitasyona imkan tanırken; hamstring tendon greftlerinde donör saha morbiditesi düşük olsa da tendon-kemik iyileşmesinin daha uzun sürmesi iyileşme sürecini geciktirmektedir. Tendon transferi sonrasında normal kemik-tendon iyileşmesi; ikinci haftada vasküler yapıların ve şekilli kan elemanlarının tünelde toplanmasıyla başlar, dördüncü haftada ince bir yeni kemik tabakasının oluşumuyla devam eder. Sekizinci haftada ara doku daha organize hale gelip kollajen fibriller artarken, on ikinci haftada olgunlaşan kollajen lifler kemik içinden başlayıp tendon içine kadar kesintisiz bir devamlılık sağlayarak kasın çekme yönünde dizilir. Yirmi altıncı haftaya gelindiğinde ise matürasyonunu sürdüren bu bağ dokusu yapısı, kemik-tendon bileşkesinin kopma eşiğini tendonun kendi direncini aşacak düzeyde yükseltir ve kemik-kemik kaynamasına benzer şekilde biyomekanik bütünlüğünü tamamlar.
Anterior cruciate ligament (ACL) injuries are a significant public health problem that disrupts knee joint stabilization, leading to social and economic losses, and requires meticulous management of rehabilitation phases due to the tendon-to-bone healing process within the bone tunnel. Bone-patellar tendon-bone (B-PT-B) autografts, widely preferred in treatment, allow for earlier rehabilitation by healing in a shorter time inside the tunnel thanks to their bone blocks; conversely, while hamstring tendon grafts offer lower donor site morbidity, their longer tendon-to-bone healing duration delays the recovery process. Normal bone-tendon healing after tendon transfer begins in the second week with the accumulation of vascular structures and formed blood elements in the tunnel, and continues in the fourth week with the formation of a thin new bone layer. In the eighth week, the interface tissue becomes more organized and collagen fibrils increase, while by the twelfth week, the maturing collagen fibers maintain continuity stretching from inside the bone into the tendon, aligning in the pulling direction of the muscle. By the twenty-sixth week, this connective tissue structure continuing its maturation raises the failure threshold of the bone-tendon junction to a level exceeding the tendon's own resistance, completing its biomechanical integrity much like normal bone-to-bone healing.
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