scholarly journals Knee laxity in anterolateral complex injuries versus medial meniscus posterior horn injuries in anterior cruciate ligament injured knees: A cadaveric study

2020 ◽  
Vol 106 (5) ◽  
pp. 945-955
Author(s):  
Ji Hyun Ahn ◽  
In Jun Koh ◽  
Michelle H. McGarry ◽  
Nilay A. Patel ◽  
Charles C. Lin ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Medial Meniscus ◽  
Cruciate Ligament ◽  
Knee Laxity ◽  
Posterior Horn ◽  
Cadaveric Study ◽  
Anterolateral Complex ◽  
Anterior Cruciate ◽  
Complex Injuries

Effects of Partial and Total Meniscectomy on Kinematics of the Knee: A Magnetic Resonance Imaging Study

2003 ◽  
Author(s):  
Jiang Yao ◽  
Jason C. Snibbe ◽  
Michael D. Maloney ◽  
Amy L. Lerner
Keyword(s):  
Anterior Cruciate Ligament ◽  
Magnetic Resonance ◽  
Medial Meniscus ◽  
Cruciate Ligament ◽  
Knee Kinematics ◽  
Imaging Study ◽  
Posterior Horn ◽  
Clear Understanding ◽  
Chronic Instability ◽  
Anterior Cruciate

Meniscal injuries frequently occur in combination with anterior cruciate ligament (ACL) tears. Tears in the menisci that occur acutely with ACL injury are located either medially or laterally, but in ACL deficient knees chronic instability most commonly leads to meniscal tears in the posterior horn of medial meniscus (Smith & Barrett, 2001). Levy et al. (1982) suggested that medial meniscus might act as a mechanical wedge preventing tibial anterior translation due to its firm attachment to the tibia at the posterior horn. Previous biomechanical studies infer the role of the meniscus through measurements of alternations in forces or knee motions (Shoemaker & Markolf, 1986; Allen, 2000), however no study has provided clear images of the motion or deformation of the meniscus itself. The objective of this study was to investigate the effects of anterior cruciate ligament resection, as well as partial and complete meniscectomies on knee kinematics in response to anterior loading. Application of loads during magnetic resonance (MR) imaging allows us to visualize the motion and deformation of the menisci, and therefore obtain a more clear understanding of its role in knee stability.

Medial Meniscus Resection Increases and Medial Meniscus Repair Preserves Anterior Knee Laxity: A Cohort Study of 4497 Patients With Primary Anterior Cruciate Ligament Reconstruction

2017 ◽  
Vol 46 (2) ◽  
pp. 357-362 ◽  
Author(s):  
Riccardo Cristiani ◽  
Erik Rönnblad ◽  
Björn Engström ◽  
Magnus Forssblad ◽  
Anders Stålman
Keyword(s):  
Anterior Cruciate Ligament ◽  
Ligament Reconstruction ◽  
Medial Meniscus ◽  
Cruciate Ligament ◽  
Knee Laxity ◽  
Meniscus Repair ◽  
Cruciate Ligament Reconstruction ◽  
Resection Group ◽  
Anterior Cruciate ◽  
Postoperative Knee

Background: There are still controversies regarding the effects on knee laxity of additional meniscus resection or repair in the setting of anterior cruciate ligament reconstruction (ACLR). Hypothesis/Purpose: The purpose was to determine the effects on knee laxity of resection or repair of medial meniscus (MM) or lateral meniscus (LM) injuries in the ACLR knee. The hypothesis was that patients with an additional meniscus resection would have significantly increased postoperative knee laxity versus that of an isolated ACLR, whereas patients with meniscus repair would have laxity comparable to that of an isolated ACLR. Study Design: Cohort study; Level of evidence, 3. Methods: The KT-1000 arthrometer, with an anterior tibial load of 134 N, was used to evaluate knee laxity preoperatively and at 6-month postoperative follow-up for a total of 4497 patients with primary hamstring tendon ACLR. Patients with isolated ACLR or ACLR with additional MM resection, MM repair, LM resection, LM repair, or MM plus LM resection were compared, with the isolated ACLR group as a control. Results: All patients showed a significant reduction of knee laxity preoperatively (3.6 ± 3.1 mm) to postoperatively (1.9 ± 2.2 mm) ( P < 0.0001). Patients who had an ACLR with either an MM resection (2.2 ± 2.55 mm) or MM + LM resection (2.35 ± 2.30 mm) showed significant increased postoperative knee laxity versus isolated ACLR (1.74 mm ± 2.11 mm) ( P < 0.05), whereas patients with MM repair (1.69 ± 2.37 mm) did not show significantly different knee laxity when compared with the control group ( P > 0.05). LM resection or repair did not significantly affect knee laxity. Significantly more surgical failures, defined as side-to-side difference >5 mm, were found in the ACLR + MM resection group and the ACLR + MM + LM resection group. Conclusion: In ACLR, additional MM resection increased whereas MM repair preserved knee laxity in comparison with the ACLR knee with intact menisci. Neither LM resection or LM repair showed a significant effect on knee laxity. Surgeons should make every effort to repair the meniscus whenever possible to avoid the residual postoperative laxity present in the meniscus-deficient knee.

Altered Knee Laxity and Stiffness in Response to a Soccer Match Simulation in Players Returning to Sport Within 12 Months After Anterior Cruciate Ligament Reconstruction

2021 ◽  
pp. 036354652110130
Author(s):  
Stefano Nuccio ◽  
Luciana Labanca ◽  
Jacopo Emanuele Rocchi ◽  
Pier Paolo Mariani ◽  
Paola Sbriccoli ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Cruciate Ligament ◽  
Return To Sport ◽  
Knee Laxity ◽  
Activity Level ◽  
Soccer Players ◽  
Control Group ◽  
Soccer Match ◽  
Anterior Cruciate ◽  
Anterior Knee

Background: The acute effects of exercise on anterior knee laxity (AKL) and anterior knee stiffness (AKS) have been documented in healthy participants, but only limited evidence has been provided for athletes cleared to return to sports after anterior cruciate ligament (ACL) reconstruction (ACLR). Purpose/Hypothesis: The purpose was to determine if 45 minutes of a soccer match simulation lead to acute changes in AKL and AKS in soccer players returning to sport within 12 months after ACLR. We hypothesized that the reconstructed knee of the ACLR group would exhibit an altered response to sport-specific exercise. Study Design: Controlled laboratory study. Methods: A total of 13 soccer players cleared to return to sport after ACLR and 13 healthy control soccer players matched for age, physical activity level, limb dominance, and anthropometric characteristics were recruited. To assess the effects of a standardized soccer match simulation (Soccer Aerobic Field Test [SAFT45]) on AKL and AKS, an arthrometric evaluation was carried out bilaterally before and immediately after SAFT45. To conduct a comprehensive examination of the force-displacement curve, the absolute and side-to-side difference (SSD) values of both AKL and AKS were extracted at 67, 134, and 200 N. Results: The ACLR and control groups showed similar AKL and AKS at baseline ( P > .05). In response to SAFT45, laxity increased bilaterally at all force levels by 14% to 17% only in the control group ( P < .025). Similarly, AKS at 134 and 200 N decreased in response to SAFT45 only in the control group (10.5% and 20.5%, respectively; P < .025). After SAFT45, the ACLR group had 1.9 and 2.5 times higher SSDs of AKS at 67 and 134 N compared with the control group, respectively ( P < .025), as well as a 1.9 times higher SSD of AKS at 134 N compared with baseline ( P = .014). Conclusion: Soccer players at the time of return to sport after ACLR showed an altered mechanical response to a sport-specific match simulation consisting of bilaterally unchanged AKL and AKS. Clinical Relevance: Soccer players showing altered AKL and AKS in response to exercise after ACLR may not be ready to sustain their preinjury levels of sport, thus potentially increasing the risk of second ACL injuries.

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