Table 2.
Frequency of Unilateral versus Bilateral Outcomes Among People with or without Accelerated, Typical or No Knee Osteoarthritis (KOA)
| Person-based Outcome | Laterality of Outcome | n (%) |
|---|---|---|
| Phase 1: Year 1- Year 5 (n = 715) | ||
| Accelerated KOA (n = 25) | Unilateral (contralateral = Typical KOA) | 9 (36%) |
| Unilateral (contralateral = No KOA) | 9 (36%) | |
| Bilateral | 7 (28%) | |
| Typical KOA (n = 93) | Unilateral | 64 (69%) |
| Bilateral | 29 (31%) | |
| No KOA (n = 597) | Unilateral | 0 (0%) |
| Bilateral | 597 (100%) | |
| Phase 2: Year 5- Year 10 (n = 574) | ||
| Accelerated KOA (n = 18) | Unilateral (contralateral = Typical KOA) | 5 (28%) |
| Unilateral (contralateral = No KOA) | 4 (22%) | |
| Bilateral | 9 (50%) | |
| Typical KOA (n = 169) | Unilateral | 83 (49%) |
| Bilateral | 86 (51%) | |
| No KOA (n = 387) | Unilateral | 0 (0%) |
| Bilateral | 387 (100%) | |
| Phase 3: Year 10 - Year 15 (n = 377) | ||
| Accelerated KOA (n = 20) | Unilateral (contralateral = Typical KOA) | 3 (15%) |
| Unilateral (contralateral = No KOA) | 11 (55%) | |
| Bilateral | 6 (30%) | |
| Typical KOA (n = 83) | Unilateral | 51 (61%) |
| Bilateral | 32 (39%) | |
| No KOA (n = 274) | Unilateral | 0 (0%) |
| Bilateral | 274 (100%) | |
Reported percentage is based on the number within each row divided by the number of people with that outcome (i.e., AKOA, Typical KOA, or No KOA)