Introduction
Materials and methods
The Swedish National Knee Ligament Register
Investigated variables
Outcome measures
Ethics
Statistical analysis
Results
Cohort (n = 17,682) | ||
---|---|---|
% | Number | |
Gender | ||
Male | 56.6 | 10,013 |
Female | 43.4 | 7669 |
Age at index ACL reconstruction (years) | ||
13–15 | 7.4 | 1300 |
16–20 | 28.7 | 5057 |
21–25 | 20.7 | 3667 |
26–30 | 14.2 | 2513 |
31–35 | 10.0 | 1777 |
36–49 | 18.9 | 3350 |
Meniscus injury present (medial and/or lateral) at index surgery | ||
Yes | 43.8 | 7743 |
No | 56.2 | 9939 |
Cartilage injury present at index surgery | ||
Yes | 26.0 | 4598 |
No | 74.0 | 13,084 |
Meniscus and/or cartilage injury at index surgery | ||
Yes | 54.8 | 9685 |
No | 45.2 | 7997 |
Contralateral ACL reconstruction cohort (n = 526) | |||||
---|---|---|---|---|---|
% |
N
| Hazard rate | 95% CI |
P value | |
Gender | |||||
Malea
| 49.4 | 260 | 1.337 | 1.127–1.586 |
0.001
|
Female | 50.6 | 266 | |||
Age at index ACL reconstruction (years) | |||||
13–15 | 16.7 | 88 | 2.771 | 1.456–5.272 |
0.002
|
16–20 | 43.7 | 230 | 1.230 | 0.689–2.197 | n.s. |
21–25 | 16.7 | 88 | 0.752 | 0.394–1.441 | n.s. |
26–30 | 8.2 | 43 | 0.491 | 0.229–1.054 | n.s. |
31–35 | 6.1 | 32 | 0.532 | 0.232–1.220 | n.s. |
36–49a
| 8.6 | 45 | |||
Meniscus injury present (medial and/or lateral) at index surgery | |||||
Yes | 45.1 | 237 | 1.086 | 0.914–1.289 | n.s. |
Noa
| 54.9 | 289 | |||
Cartilage injury present at index surgery | |||||
Yes | 22.4 | 118 | 0.765 | 0.623–0.939 |
0.010
|
Noa
| 77.6 | 408 |
Gender
Age at index ACL reconstruction
Meniscus injury and cartilage injury
Surgical technique
Group | HR | Adjusted HRa
| |||||||
---|---|---|---|---|---|---|---|---|---|
HR | 95% CI |
P value | HR | 95% CI |
P value | ||||
Comparison group | No. of eventsb
| Reference group | No. of eventsb
| ||||||
TP reference (n = 6685) |
n = 153 | TP anatomic (n = 4036) |
n = 99 | 1.159 | 0.899–1.493 | 0.254 | 1.147 | 0.890–1.478 | n.s. |
TT non-anatomic (n = 1296) |
n = 54 | 0.957 | 0.686–1.337 | 0.789 | 0.951 | 0.681–1.329 | n.s. | ||
TT anatomic (n = 2158) |
n = 96 | 1.241 | 0.936–1.645 | 0.134 | 1.226 | 0.925–1.626 | n.s. | ||
TT partial-anatomic (n = 1516) |
n = 55 | 0.828 | 0.594–1.154 | 0.265 | 0.859 | 0.617–1.198 | n.s. | ||
All landmarks (n = 9397) |
n = 246 | No landmarks (n = 831) |
n = 41 | 1.144 | 0.815–1.604 | 0.437 | 1.152 | 0.821–1.617 | n.s. |
Both footprints (n = 14,236) |
n = 401 | No footprints (n = 1270) |
n = 53 | 1.226 | 0.918–1.637 | 0.167 | 1.250 | 0.936–1.669 | n.s. |
Both ridges (n = 10,576) |
n = 276 | No ridges (n = 3173) |
n = 111 | 1.157 | 0.925–1.446 | 0.201 | 1.145 | 0.915–1.432 | n.s. |
TP Drilling (n = 12,440) |
n = 314 | TT Drilling (n = 5109) |
n = 208 | 1.034 | 0.866–1.236 | 0.709 | 1.034 | 0.865–1.236 | n.s. |