Table 3.
Knee pathology at arthroscopy
| Variables | Patients with knee OA (n = 269) | Patients without knee OA (n = 351) | p-value |
|---|---|---|---|
| Type of surgery, n (%) | < 0.001 | ||
| Resection | 269 (100) | 311 (89) | |
| Repair | 0 (0) | 33 (9) | |
| Both | 0 (0) | 7 (2) | |
| Meniscal tissue quality, n (%) | < 0.001 | ||
| Non-degenerative | 0 (0) | 245 (70) | |
| Degenerative | 269 (100) | 86 (24) | |
| Undetermined | 0 (0) | 20 (6) | |
| Compartment, n (%) | 0.07 | ||
| Medial | 208 (77) | 253 (72) | |
| Lateral | 35 (13) | 70 (20) | |
| Both | 26 (10) | 28 (8) | |
| Tear pattern, n (%) | < 0.001 | ||
| Longitudinal-vertical a | 16 (6) | 101 (29) | |
| Horizontal | 27 (10) | 15 (4) | |
| Radial | 16 (6) | 25 (7) | |
| Vertical flap | 65 (24) | 77 (22) | |
| Horizontal flap | 11 (4) | 18 (5) | |
| Complex | 107 (40) | 68 (19) | |
| Root tear | 1 (0) | 1 (0) | |
| More than 1 tear pattern | 26 (10) | 46 (13) | |
| Radial location b, n (%) | 0.3 | ||
| Posterior | 192 (71) | 214 (62) | |
| Posterior + mid-body | 38 (14) | 65 (19) | |
| Posterior + anterior | 1 (1) | 1 (0) | |
| Mid-body | 19 (7) | 35 (10) | |
| Anterior + mid-body | 3 (1) | 6 (2) | |
| Anterior | 9 (3) | 11 (3) | |
| All | 7 (3) | 15 (4) | |
| ICRS cartilage grade, n (%) | |||
| Medial compartment | < 0.001 | ||
| Grade 0 | 6 (2) | 172 (49) | |
| Grade 1 | 58 (22) | 88 (25) | |
| Grade 2 | 68 (25) | 48 (14) | |
| Grade 3 | 103 (38) | 36 (10) | |
| Grade 4 | 34 (13) | 7 (2) | |
| Lateral compartment | < 0.001 | ||
| Grade 0 | 48 (18) | 215 (61) | |
| Grade 1 | 106 (39) | 100 (28) | |
| Grade 2 | 67 (25) | 25 (7) | |
| Grade 3 | 36 (13) | 9 (3) | |
| Grade 4 | 12 (5) | 2 (1) | |
| Patellofemoral compartment | < 0.001 | ||
| Grade 0 | 24 (9) | 204 (58) | |
| Grade 1 | 82 (30) | 85 (24) | |
| Grade 2 | 70 (26) | 34 (10) | |
| Grade 3 | 66 (25) | 23 (7) | |
| Grade 4 | 27 (10) | 5 (1) |
OA: osteoarthritis; ICRS: International Cartilage Repair Society.
a
Extension is a bucket handle tear.
b
Missing data for patients without OA (n = 4).