| PENS | Percutaneous electrical nerve stimulation |
| KOA | Knee osteoarthritis |
| TENS | Transcutaneous electrical nerve stimulation |
| WOMAC | Western Ontario and McMaster Universities Osteoarthritis Index |
| VAS | Visual Analogue Scale |
| CPGS | Chronic Pain Grading Scale |
| PPT | Pressure Pain Threshold |
| CPM | Conditioned Pain Modulation |
| TSP | Temporal Summation of Pain |
| TUG | Timed Up and Go |
| SPPB | Short Physical Performance Battery |
| STAI | State-Trait Anxiety Inventory |
| BDI-II | Beck Depression Inventory-II |
| PCS | Pain Catastrophizing Scale |
| TSK-11 | Tampa Scale for Kinesiophobia |
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