Sternal Synchondroses

synchondroses sternales

The sternal synchondroses are the cartilaginous joints between the sternebrae that partially persist in the adult sternum, representing the developmental fusion sites between the originally segmented sternal bars.

Region: Chest

Biomechanics

Function & Actions

Provide the structural continuity of the mature sternum, may act as stress absorbers during impact, and represent the anatomical basis of sternal dehiscence patterns after median sternotomy.

Clinical Relevance

Clinical Notes

Sternal dehiscence after median sternotomy (a serious post-CABG complication occurring in 1-3%) propagates through residual synchondrosis planes if not fully wired. Infected sternal synchondrosis requires debridement and reconstruction with pectoralis or rectus flaps. Congenital sternal clefts result from failure of midline fusion of the sternal bars.

Pathology

Common Injuries & Conditions

Sternal Dehiscence After Sternotomy

Failure of sternal wire approximation propagating through residual synchondrosis planes producing mediastinitis and sternal instability, requiring rewiring and flap closure.

Congenital Sternal Cleft

Developmental failure of midline sternal synchondrosis producing a visible cardiac pulsation beneath thin skin, repaired in infancy with sternal reconstruction.