Abstract
Purpose
To analyse possible associations between the preoperative pivot shift (PS) test and both patient and injury characteristics in anterior cruciate ligament (ACL)-injured knees, considering previously neglected meniscal injuries such as ramp and root tears. The hypothesis was that a preoperative grade III PS was associated with the amount of intra-articular soft-tissue damage and chronicity of the injury.
Methods
The cohort involved 376 patients who underwent primary ACL reconstruction (239 males/137 females; median age 26). Patients were examined under anesthesia before surgery, using the PS test. During arthroscopy, intra-articular soft-tissue damage of the injured knee was classified as: (1) partial ACL tear; (2) complete isolated ACL tear; (3) complete ACL tear with one meniscus tear; and (4) complete ACL and bimeniscal tears. Chi-square and Mann–Whitney U tests were used to evaluate whether sex, age, body mass index, sport at injury, mechanism of injury, time from injury and intra-articular damage (structural damage of ACL and menisci) were associated with a grade III PS. Intra-articular damage was further analyzed for two sub-cohorts: acute (time from injury ≤ 6 months) and chronic injuries (> 6 months).
Results
A grade III PS test was observed in 26% of patients. A significant association with PS grading was shown for age, time from injury and intra-articular soft-tissue damage (p < 0.05). Further analyses showed that grade III PS was associated with intra-articular damage in chronic injuries only (p < 0.01). In complete ACL and bimeniscal tears, grade III PS was more frequent in chronic (53%) than in acute knee injuries (26%; p < 0.01). Patients with chronic complete ACL and bimeniscal tears had a grade III PS 3.3 [1.3–8.2] times more often than patients in the acute sub-cohort.
Conclusion
In ACL-injured patients, a preoperative grade III PS was mainly associated with a higher amount of intra-articular soft-tissue damage and chronicity of the injury. Patients with complete chronic ACL injuries and bimeniscal tears were more likely to have a preoperative grade III PS than their acute counterparts. This suggests that grade III PS may be an early sign of knee decompensation of dynamic rotational knee laxity in chronic ACL-injured knees with bimeniscal lesions.
Level of evidence
Level III.
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Abbreviations
- ACL:
-
Anterior cruciate ligament
- BMI:
-
Body mass index
- CI:
-
Confidence interval
- IRB:
-
Institutional Review Board
- IQR:
-
Inter quartile range
- LM:
-
Lateral meniscus
- MM:
-
Medial meniscus
- MRI:
-
Magnetic Resonance Imaging
- ns:
-
Not significant
- PS:
-
Pivot shift
- TFI:
-
Time from injury
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Investigation performed at Sports Clinic, Centre Hospitalier de Luxembourg–Clinique d’Eich, Luxembourg.
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Magosch, A., Jacquet, C., Nührenbörger, C. et al. Grade III pivot shift as an early sign of knee decompensation in chronic ACL-injured knees with bimeniscal tears. Knee Surg Sports Traumatol Arthrosc 30, 1611–1619 (2022). https://doi.org/10.1007/s00167-021-06673-x
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DOI: https://doi.org/10.1007/s00167-021-06673-x