Damage or impairment to the ulna bone in the forearm.
To support a rating at any level, medical records showing how your ulna fracture healed are central. Imaging such as X-rays or CT scans can document whether the bone fused, where along the ulna the nonunion or malunion occurred, and whether there is bone loss of one inch or more or visible deformity or bad alignment.
For the higher ratings involving nonunion with false movement in the upper half, an examining provider's notes describing abnormal mobility at the fracture site, measurements of any bone gap, and observations of deformity are especially relevant. For a 40% or 30% rating, records that confirm bone loss of at least one inch and marked deformity carry particular weight.
For any rating level, statements from you or people who know you describing how the arm's weakness, instability, or deformity affects tasks at work or in daily life can help show the functional impact that corresponds to the clinical findings.
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.
