Which of the following symptoms signifies limb girdle muscular dystrophy?

• A. Distal muscle weakness
• B. Proximal muscle weakness of pelvis and shoulder
• C. Rapid muscle atrophy
• D. Severe skeletal deformities

Answer: (B)

Limb girdle muscular dystrophy (LGMD) is characterized primarily by proximal muscle weakness, particularly affecting the muscles of the pelvis and shoulder girdle. This weakness manifests as difficulty with activities such as climbing stairs, lifting objects overhead, or rising from a seated position. The focus on proximal muscle involvement is crucial in distinguishing LGMD from other neuromuscular disorders.

In LGMD, the symptoms develop progressively and typically first present in the muscles closest to the torso, leading to significant disability over time, particularly in tasks requiring strength from the hip and shoulder areas. Hence, the description of proximal muscle weakness of the pelvis and shoulder accurately captures the defining feature of this condition.

The other options do not align with the classic presentation of limb girdle muscular dystrophy. Distal muscle weakness, for example, is more characteristic of other types of muscular dystrophies or neuromuscular conditions, as is rapid muscle atrophy and severe skeletal deformities, which may occur in other muscular dystrophies but are not signature symptoms of LGMD. Therefore, the emphasis on proximal weakness in the pelvis and shoulder region is what underscores the diagnosis of limb girdle muscular dystrophy.