Table 1. Grade of Restriction of Daily Living Activities by Squeaking.
| Grade | Restriction of daily living activities |
|---|---|
| I (Mild) | Only sound exists without any discomfort |
| II (Moderate) | I. Intermittent sound |
| II. Patients deliberately restrict the motion not to make the sound in public | |
| II (Severe) | I. Continuous sound |
| II. Revision is considered seriously due to the sound |