Abstract
Purpose
The purpose of this study was to evaluate the clinical outcomes of patients who were treated with an arthroscopic popliteus bypass (PB) technique, in cases of a posterolateral rotational instability (PLRI) and a concomitant posterior cruciate ligament (PCL) injury of the knee.
Methods
This was a retrospective case series in which 23 patients were clinically evaluated after a minimum of 2 years following arthroscopic PB and combined PCL reconstruction. Lysholm, Tegner and Knee Injury and Osteoarthritis Outcome scores as well as visual analog scales (VAS) for joint function and pain were evaluated. Posterior laxity was objectified with stress radiography and a Rolimeter examination. Rotational instability was graded with the dial test.
Results
23 patients were available for follow-up, 46.0 ± 13.6 months after surgery. The median time interval from the initial injury to the surgery was 6.0 (3.5;10.5) months. The postoperative Lysholm Score was 95.0 (49–100); the Tegner Score changed from 6.0 (3–10) before the injury to 5.0 (0–10) at the follow-up examination (p = 0.013). The side-to-side difference on stress radiography (SSD) of posterior translation changed from 10.4 (6.6–14.8) mm before the injury to 4.0 (0.2–5.7) mm postoperatively (p < 0.01). Rotational instability was reduced to grade A (82.6%) or B (17.4%) (IKDC). The Rolimeter SSD was 2.0 (0–3) mm at the follow-up examination. VAS Function 0 (0–5), VAS pain 0 (0–6).
Conclusions
The arthroscopic PB graft technique provided good-to-excellent clinical results in the mid-term follow-up in patients with type A PLRI and concomitant PCL injury. However, an exact differentiation of lateral, rotational and dorsal instabilities of posterolateral corner (PLC) injuries is crucial, for the correct choice of therapy, as cases with lateral instabilities require more complex reconstruction techniques. Arthroscopic posterolateral corner reconstruction is a safe procedure with a high success rate in the mid-term follow-up.
Level of evidence
IV.
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Abbreviations
- IKDC:
-
International Knee Documentation Committee
- KOOS:
-
Knee Injury and Osteoarthritis Outcome Score
- LCL:
-
Lateral collateral ligament
- PB:
-
Popliteus bypass
- PCL:
-
Posterior cruciate ligament
- PLC:
-
Posterolateral corner
- PLRI:
-
Posterolateral rotational instability
- PTT:
-
Posterior tibial translation
- SD:
-
Standard deviation
- SSD:
-
Side-to-side difference
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Acknowledgements
T.C.D. was supported by a research fellowship from Asklepios Clinic Group. The study was supported by albrecht© (Bernau, Germany). K.-H.F. received grants and is member of the Arthrex Advisory Board.
Funding
The study was supported by Albrecht® (Bernau, Germany).
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IRB approval was given by the ethics committee of the Medical Chamber Hamburg, Germany (ID PV 7068).
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T.C.D. was supported by a research fellowship from Asklepios Clinic Group. K.-H.F. received grants and is member of the Arthrex Advisory Board. The other authors declare to have no conflict of interest.
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Drenck, T.C., Frings, J., Preiss, A. et al. The treatment of posterolateral knee instability with combined arthroscopic popliteus bypass and PCL reconstruction provides good-to-excellent clinical results in the mid-term follow-up . Knee Surg Sports Traumatol Arthrosc 30, 1414–1422 (2022). https://doi.org/10.1007/s00167-021-06590-z
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DOI: https://doi.org/10.1007/s00167-021-06590-z