A non-cancerous growth or tumor in the bone.
Because the rating is based on functional loss rather than the tumor diagnosis itself, the most helpful evidence is anything that documents what the tumor has done to how your bones and joints work. Imaging such as X-rays or MRI reports can show the location and size of the tumor and any bone involvement. Examination findings that measure range of motion, document ankylosis, or describe instability are directly tied to the criteria used in analogous codes. If a joint was surgically replaced, operative reports and records of your recovery period support the prosthetic implant rating levels. If motion is restricted, goniometric measurements taken during a VA or private examination capture the degree of limitation. Statements from you or people who know you describing difficulty with physical tasks at work or in daily life help show how the functional loss affects you in practice.
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.