The most common manifestation of osteoporosis is:

Answer is A (Compression fracture of the spine) : It most commonly presents as backache of varying degrees of severity. This backache is due to spontaneous fracture or collapse of veebra. Osteoporosis is defined as a reduction of bone mass or density, sufficient to increase the risk offracture. Osteoporosis is usually asymptomatic until fracture occurs (but serum Calcium is normal Q). Serum parathyroid hormone, 25-(OH) D2, Calcium, Phosphorus and Alkaline phosphatase are usually normal.