The question asks to identify the postural deformity related to a 'hump'. Postural deformities are deviations from the normal body posture. Let's look at the options provided and see how they relate to the term 'hump'.

Based on the descriptions, the term 'hump' is most directly associated with an excessive rounding of the upper back. This specific postural deformity is medically known as Kyphosis, and in common language, it is often described as having a 'hump' or being 'hunchbacked'.

Understanding Rounded Upper Back and Hump

A rounded upper back, also known as thoracic kyphosis, refers to an increased curve in the thoracic region of the spine. While a certain degree of curvature is natural in this area, an exaggerated curve leads to the appearance of a hump.

• A pronounced rounded upper back is a common postural deformity.
• It can be caused by various factors including poor posture, age, certain medical conditions, and congenital issues.
• The visible sign is the rounded shape or 'hump' on the upper part of the back.

Comparing Options and Identifying the Hump-Related Deformity

Let's re-examine the options in the context of a 'hump':

• Side-spine (Scoliosis) involves sideways bending, not the forward rounding that creates a hump.
• Rounded upper back is precisely the description of the deformity where a hump is present.
• Hollow back (Lordosis) is the opposite curvature (inward) usually in the lower back.
• Breaking knee affects the knee joint, completely unrelated to spinal curvature and a hump.

Therefore, the postural deformity directly related to a hump is a rounded upper back.