The thigh has reduced ability to straighten at the hip joint.
To support a 10% rating, the records need to show that extension of your thigh is limited to 5 degrees or less. A VA or private examination that measures and records the actual degrees of thigh extension is the most direct form of evidence. Goniometric readings documenting that endpoint are particularly useful. Imaging such as X-rays may help explain why motion is restricted, but the measured range of motion itself is what the rating turns on. Statements from you or people who know you describing how the limited motion affects your ability to walk, climb stairs, or perform physical tasks at work can help give context to the clinical findings, but those statements support the overall picture rather than substitute for the measured degree of extension.
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.
