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1. Bone atrophy occurring in paraplegia is of an osteoporotic nature.2. There is close association of urinary calculi and soft-tissue ossifications with the excessive calcium mobilization from the bones.3. If calcium could be held in bone, urinary calculi, soft-tissue ossifications, and pathological fractures could be prevented.4. Pressure produces bone matrix, thus allowing the deposition of calcium.5. The only logical therapeutic agent which applies pressure intermittently is ambulation.