Final answer:
A very late indication of developmental dysplasia of the hip is a limp or waddling walk. This symptom occurs as DDH progresses in toddlers and children who have not been treated. Early diagnosis is critical to prevent complications like arthritis and to ensure proper joint function.
Step-by-step explanation:
Developmental dysplasia of the hip (DDH) is a condition where the hip joint has not formed normally, which can lead to issues with joint stability and motion. The question pertains specifically to a very late indication or symptom of DDH, which suggests that the student is seeking to understand the progressive or advanced signs of the condition.
In the context of DDH, an early symptom might include uneven leg lengths or asymmetrical thigh folds. However, a very late indication of developmental dysplasia of the hip would be more severe and obvious signs such as an atypical gait pattern. In particular, the limp or waddling walk is often seen in toddlers and young children who have untreated or undiagnosed DDH, as the dysplasia progresses over time without intervention.
It is essential for DDH to be diagnosed and treated as early as possible to reduce the risk of long-term arthritis and to improve the function and stability of the hip joint. In contrast to the symptoms listed from the reference information regarding early onset disease, a very late sign like limping is more directly attributable to the mechanical joint issues in DDH rather than the early general symptoms.