The purpose of this study is to find out if standing and/or standing with vibration works for the treatment of osteoporosis for people with a spinal cord injury.

Inclusion Criteria:

• Traumatic spinal cord injury of greater than 12 months.
• Osteopenia or osteoporosis of the hip.

Exclusion Criteria:

• Pregnant or lactating females.
• Nonunion lower extremity fracture within the last 6 months.
• Bilateral hip or knee flexion contractures.
• Bilateral lower extremity total hip or knee replacement.
• Heterotopic ossification of the hip or knee.
• Concurrent treatment with a bisphosphonate.