Table 4.
Alignment classification of arthritic adult population based on the CPAK classification system
| Side | Varus (n = 400) | Neutral (n = 88) | Valgus (n = 12) | |||
|---|---|---|---|---|---|---|
| Right | Left | Right | Left | Right | Left | |
| Number | 196 | 204 | 48 | 40 | 6 | 6 |
| mHKA | – 11.92 (4.60) | – 12.55 (4.71) | – 2.37 (4.26) | – 5.12 (5.18) | 8.66 (6.74) | 8.83 (5.34) |
| aHKA | – 8.41(3.70) | – 8.80 (3.72) | – 0.22 (1.30) | – 0.8 (1.15) | 6 (3.16) | 4.5(1.22) |
| JLO | 172.74 (4.68) |
174.45 (4.92) |
172.81 (4.94) | 174.05 (4.54) | 167 (8) | 178.5 (4.18) |
| mLDFA | 90.58 (2.89) | 91.62 (3.19) | 86.52 (2.55) | 93 (0) | 80.5 (3.39) | 87 (2.52) |
| mMPTA | 82.16 (3.07) | 82.82 (2.97) | 86.29 (2.55) | 86.62 (2.36) | 86.5 (5.04) | 91.5 (1.76) |
| CPAK Classification-based phenotypes | |
|---|---|
| CPAK 1 | 294 (58.8%) |
| CPAK 2 | 69 (13.8%) |
| CPAK 3 | 7 (1.4%) |
| CPAK 4 | 91 (18.2%) |
| CPAK 5 | 17 (3.4%) |
| CPAK 6 | 5 (1%) |
| CPAK 7 | 14 (2.8%) |
| CPAK 8 | 3 (0.6%) |
| CPAK 9 | 0 (0%) |
mLDFA mechanical lateral distal femoral angle, mMPTA mechanical medial proximal tibial angle, aHKA arithmetic HKA