From the Research
The apex of thoracic kyphosis is typically located at the T6-T7 vertebral level. This represents the point of maximum posterior curvature in the normal thoracic spine. The thoracic spine naturally has a kyphotic curve (convex posteriorly) that ranges from approximately 20 to 45 degrees in adults. This normal curvature serves important biomechanical functions, including maintaining balance, absorbing shock, and distributing mechanical stress throughout the spine.
Key Points
- The apex at T6-T7 corresponds to the middle portion of the thoracic spine, which consists of 12 vertebrae total.
- This location is significant clinically because excessive kyphosis (hyperkyphosis) or reduced kyphosis (hypokyphosis) at this level can lead to postural abnormalities, pain, and potential neurological complications.
- Understanding the normal apex location helps clinicians properly assess spinal alignment and diagnose conditions like Scheuermann's kyphosis or age-related hyperkyphosis.
Evidence
The study by 1 found that the apex of kyphosis was located at T6-T7, which is consistent with the typical location of the apex of thoracic kyphosis. Although another study by 2 suggested that the apex of thoracic kyphosis is located around T8 and T9 vertebra, depending on the spinal morphotype according to Roussouly classification, the most recent and highest quality study 1 prioritizes the location at T6-T7.
Clinical Implications
The location of the apex of thoracic kyphosis is crucial in diagnosing and managing spinal conditions. Clinicians should be aware of the normal location of the apex and its significance in maintaining proper spinal alignment and preventing potential complications.