Table 2.
Baseline data for the included cohort and the patients lost to follow-up
| Category | Variable (N) | Level | Overall Cohort (n=1761) n (%) or median (25th–75th) | Lost to Follow-up @ 2 yrs (n=231) n (%) or median (25th–75th) | Lost to Follow-up @ 6 yrs (n=255) n (%) or median (25th–75th) |
|---|---|---|---|---|---|
| Patient demographics | Sex | Male | 980 (56%) | 146 (63%) | 169 (66%) |
| Female | 781 (44%) | 85 (37%) | 86 (34%) | ||
| Age | Continuous | 23 years (17–35) | 22 years (17–30) | 22 years (17–32) | |
| BMI | Continuous | 24.8 kg/m2 (22.3–27.9) | 25.4 kg/m2 (22.9–29.2) | 26.4 kg/m2 (23.2–29.9) | |
| Smoking status | Current | 167 (10%) | 32 (15%) | 44 (18%) | |
| Quit smoking (>6 months) | 172 (10%) | 15 (7%) | 16 (6%) | ||
| Never smoker | 1354 (80%) | 171 (78%) | 186 (76%) | ||
| Education level | Continuous | 14.0 years (11.0–16.0) | 13.0 years (11.0–16.0) | 12.0 years (10.0–16.0) | |
| Main sport | Basketball | 393 (23%) | 61 (27%) | 69 (27%) | |
| Football | 191 (11%) | 38 (17%) | 35 (14%) | ||
| Soccer | 230 (13%) | 17 (7%) | 20 (8%) | ||
| Other | 793 (46%) | 99 (43%) | 106 (42%) | ||
| None | 134 (8%) | 14 (6%) | 22 (9%) | ||
| Patient Reported Outcomes (PRO) | Marx activity | Baseline | 12 (8–16) | 13 (9–16) | 13 (8–16) |
| 2 Years | 9 (4–13) | N/A | 8 (1–12) | ||
| KOOS symptoms | Baseline | 68 (57–82) | 68 (50–79) | 68 (50–82) | |
| KOOS pain | Baseline | 75 (64–89) | 69 (58–86) | 72 (58–86) | |
| KOOS ADL | Baseline | 88 (74–96) | 83 (68–94) | 82 (65–94) | |
| KOOS Sports & rec | Baseline | 50 (30–75) | 50 (25–75) | 50 (25–75) | |
| KOOS QoL | Baseline | 38 (25–50) | 31 (19–50) | 31 (19–44) | |
| WOMAC stiffness | Baseline | 75 (62–88) | 75 (50–88) | 75 (50–88) | |
| WOMAC pain | Baseline | 90 (75–95) | 85 (70–95) | 85 (65–95) | |
| Surgical/Injury factors | Previous meniscal pathology | No | 1632 (93%) | 210 (91%) | 230 (90%) |
| Yes | 129 (7%) | 21 (9%) | 25 (10%) | ||
| Previous articular cartilage pathology | No | 1739 (99%) | 228 (99%) | 249 (98%) | |
| Yes | 22 (1%) | 3 (1%) | 6 (2%) | ||
| Graft type | Allograft (BTB) | 121 (7%) | 16 (7%) | 27 (11%) | |
| Allograft (soft tissue) | 299 (17%) | 39 (17%) | 35 (14%) | ||
| Autograft (BTB) | 832 (47%) | 116 (51%) | 120 (47%) | ||
| Autograft (soft tissue) | 509 (29%) | 60 (26%) | 73 (29%) | ||
| Medial meniscus treatment | Normal/none | 1106 (63%) | 149 (65%) | 173 (68%) | |
| Tear/no treatment | 94 (5%) | 10 (4%) | 10 (4%) | ||
| Repair | 229 (13%) | 39 (17%) | 35 (14%) | ||
| Partial excision | 317 (18%) | 33 (14%) | 37 (15%) | ||
| Other | 15 (1%) | 0 (0%) | 0 (0%) | ||
| Lateral meniscus treatment | Normal/none | 927 (53%) | 118 (51%) | 127 (50%) | |
| Tear/no treatment | 197 (11%) | 25 (11%) | 25 (10%) | ||
| Repair | 128 (7%) | 16 (7%) | 22 (9%) | ||
| Partial excision | 497 (28%) | 72 (31%) | 80 (31%) | ||
| Other | 12 (1%) | 0 (0%) | 1 (<1%) | ||
| Medial femoral condyle | Normal/grade 1 | 1381 (78%) | 189 (82%) | 202 (79%) | |
| Grade 2 | 225 (13%) | 30 (13%) | 31 (12%) | ||
| Grade 3 | 117 (7%) | 8 (3%) | 15 (6%) | ||
| Grade 4 | 38 (2%) | 4 (2%) | 7 (3%) | ||
| Lateral femoral condyle | Normal/grade 1 | 1498 (85%) | 197 (85%) | 209 (82%) | |
| Grade 2 | 186 (11%) | 24 (10%) | 32 (13%) | ||
| Grade 3 | 59 (3%) | 10 (4%) | 11 (4%) | ||
| Grade 4 | 18 (1%) | 0 (0%) | 3 (1%) | ||
| Medial tibial plateau | Normal/grade 1 | 1694 (96%) | 228 (99%) | 250 (99%) | |
| Grade 2 | 45 (3%) | 1 (<1%) | 1 (<1%) | ||
| Grades 3–4 | 22 (1%) | 0 (0%) | 0 (0%) | ||
| Lateral tibial plateau | Normal/grade 1 | 1611 (91%) | 215 (94%) | 230 (92%) | |
| Grade 2 | 122 (7%) | 13 (6%) | 20 (8%) | ||
| Grades 3–4 | 28 (2%) | 0 (0%) | 0 (0%) | ||
| Patella | Normal/grade 1 | 1470 (83%) | 199 (90%) | 213 (88%) | |
| Grade 2 | 181 (10%) | 21 (10%) | 29 (12%) | ||
| Grades 3–4 | 110 (6%) | 0 (0%) | 0 (0%) | ||
| Trochlea | Normal/grade 1 | 1641 (93%) | 219 (96%) | 238 (96%) | |
| Grade 2 | 82 (5%) | 10 (4%) | 11 (4%) | ||
| Grades 3–4 | 38 (2%) | 0 (0%) | 0 (0%) |