The thigh has reduced ability to bend forward at the hip joint.
The most direct evidence for this condition is a measurement of your hip flexion recorded during a physical examination. A VA Compensation and Pension exam or records from your treating provider that document the specific degree to which flexion is limited are central to establishing which rating level applies. Multiple exam findings taken over time can be useful if your range of motion varies. Your doctor's notes describing pain, guarding, or muscle spasm that reduce motion may also be relevant. Statements from you or people who know you that describe how limited hip movement affects your ability to walk, climb stairs, sit for extended periods, or perform physical work can help show the practical impact of the restriction. The key is connecting the documented degree of flexion loss to the specific threshold — 45, 30, 20, or 10 degrees — that corresponds to each rating level.
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.