Some common geriatric bone disorders include:

1. Osteoporosis: This is a condition characterized by low bone density and increased risk of fractures. It is common in older adults, especially postmenopausal women, due to hormonal changes and decreased bone reabsorption.

2. Osteoarthritis: This is a degenerative joint disease that affects the cartilage and bones in joints, causing pain, stiffness, and reduced range of motion. Aging and wear and tear on joints over time contribute to the development of osteoarthritis.

3. Sarcopenia: It means muscle weakness which occurs in old age. Like bones become weak, muscles also become weak because of a decrease in sex hormones and less physical activity.

4. Rheumatoid arthritis: This is an autoimmune disease that primarily affects the joints. It causes chronic inflammation, joint pain, swelling, and stiffness in affected individuals. While it can occur at any age, it is more commonly diagnosed in older adults.

5. Osteomalacia: This is a disorder characterized by softening of the bones due to a deficiency of vitamin D or calcium in older adults. It can lead to bone pain, fractures, and muscle weakness.

6. Bone fractures: Older adults are more susceptible to fractures due to age-related changes in bone density, muscle weakness, and a higher risk of falls. Common fractures in the elderly include hip fractures, vertebral fractures, and wrist fractures.