The examiner must make a determination as to how pain could affect the functional use of your orthopedic condition. This is because if something hurts to bend a certain way, you are not likely to bend that way very often. This degree of functional loss must be considered when the VA assigns a rating for each service-connected condition.
Generally, if there is pain on movement for a service-connected condition, the VA will assign at least a 10% rating for that condition.