| CACP | Camptodactyl-arthropathy-coxa vara-pericarditis |
| ROS | Reactive oxygen species |
| COF | Coefficient of friction |
| OA | Osteoarthritis |
| IA | Intra-articular |
| HSL | Human synoviocyte lubricin (PRG4) |
| PN | Peroxynitrite |
| O−2 | Superoxide |
| NO | Nitric oxide |
| mRNA | Messenger RNA |
| ONOO− | Peroxynitrite |
| −OH | Hydroxyl radical |
| DAPI | 4,6-Diamidino-2-phenylindole, dihydrochloride |
| EDTA | Ethylenediaminetetraacetic acid |
| EGTA | Ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid |
| PMSF | Phenylmethylsulfonyl fluoride |
| H&E | Hematoxylin and eosin |
| Prg4 | Murine lubricin gene |
| PRG4 | Purified lubricin protein (Proteoglycan 4) |