Softening of the bones due to vitamin D deficiency or mineral loss.
Because your rating depends on the residuals of osteomalacia rather than the disease itself, the evidence that helps is whatever documents those lasting impairments. Medical records showing the nature and extent of any bone deformity, joint involvement, or structural changes are central. Physician examination findings that measure range of motion, document ankylosis, or describe functional loss of an affected limb or joint are directly relevant, because many musculoskeletal residuals are rated on those findings. Imaging such as X-rays or bone scans that show structural damage remaining after the condition is treated can support the picture. Statements from you or people who know you describing how the residuals affect your ability to work, walk, lift, or carry out daily tasks can also help show the real-world impact of whatever impairment is being rated. The closer the evidence ties to the specific measurements or findings required by the diagnostic code covering your residual, the more directly it speaks to the rating criteria.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.