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    Failure risks in anatomic single-bundle anterior cruciate ligament reconstruction via the outside-in tunnel technique using a hamstring autograft
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    Anterior cruciate ligament reconstruction is one of the most commonly performed procedures in orthopaedics, with more than 125,000 performed in the United States per year. There are several reconstruction graft choices that can be used to reconstruct the native anterior cruciate ligament, with autograft hamstring tendons being one of the most commonly used. Preparation of a hamstring autograft varies depending on patient characteristics and physician preference. The purpose of this Technical Note is to describe in detail different variants of hamstring graft preparation techniques that are commonly used in practice.
    Hamstring muscles
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    Background The intent of double-bundle anterior cruciate ligament reconstruction is to reproduce the normal anterior cruciate ligament anatomy and improve knee joint rotational stability. However, no consensus has been reached on the advantages of this technique over the single-bundle technique. Hypothesis We hypothesized that double-bundle anterior cruciate ligament reconstruction could provide better intraoperative stability and clinical outcome than single-bundle reconstruction. Type of study: Cohort study; Level of evidence, 2. Methods Forty patients with anterior cruciate ligament injury in one knee were recruited; 20 were allocated to a double-bundle anterior cruciate ligament reconstruction group and 20 to a single-bundle anterior cruciate ligament reconstruction group. Intraoperative stabilities at 30° of knee flexion were compared between the 2 groups using a navigation system. Clinical outcomes including Lysholm knee scores, Tegner activity scores, Lachman and pivot-shift test results, and radiographic stabilities were also compared between the 2 groups after a minimum of 2 years of follow-up. Results Intraoperative anterior and rotational stabilities after anterior cruciate ligament reconstruction in the double-bundle group were significantly better than those in single-bundle group (P = .020 and P < .001, respectively). Nineteen patients (95%) in each group were available at a minimum 2-year follow-up. Clinical outcomes including Lysholm knee and Tegner activity scores were similar in the 2 groups at 2-year follow-up (P > .05). Furthermore, stability results of the Lachman and pivot-shift tests, and radiologic findings at 2-year follow-up failed to reveal any significant intergroup differences (P > .05). Conclusion Although double-bundle anterior cruciate ligament reconstruction produces better intraoperative stabilities than single-bundle anterior cruciate ligament reconstruction, the 2 modalities were found to be similar in terms of clinical outcomes and postoperative stabilities after a minimum of 2 years of follow-up.
    Lachman test
    Pivot-shift test
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    Day-case anterior cruciate ligament reconstruction has the potential benefit of reduced hospital stay and reduced cost of care. The goal of this preliminary report was to compare the outcome of day-case arthroscopic anterior cruciate ligament reconstruction with those of in-patient care in terms of pain control and short-term functional outcome.This was a prospective comparative study involving patients who had anterior cruciate ligament reconstruction performed in our unit between January 2019 to July 2021 for isolated anterior cruciate ligament rupture. The patients were offered the option of in-patient and day-case anterior cruciate ligament reconstruction. All cases were isolated anterior cruciate ligament ruptures with no other ligament injury.A total of twenty-one-day case and twenty-five in-patient anterior cruciate ligament reconstruction were managed during the period of the study. The median numeric pain scores at day 2 and 7 in the day case group was 8.0 (IQR=2.0) and 5.0 (IQR= 3.0) respectively and in-patient group was 7.0 (IQR =1.5) and 4.0 (IQR= 2.0) respectively. The international knee documentation score (IKDC) at 6 months in the day case and in-patient groups were 68.6 (IQR= 9.3) and 67.2 (IQR= 25.0) respectively. The Mann-Whitney U test indicated that patients who had ACL reconstruction on in-patient care basis had statistically significant lower visual analogue scale pain scores on the second (z=-2.58, P = 0.01) and seventh (z=-3.41 P = 0.001) post-operative days compared to patients who had ACL reconstruction on day case basis. There was no statistically significant difference in the median IKDC scores of both groups at 6 months. The cost of care in the day case group was 40% lower than those of the in-patient group.Although the cost of care in the day case group appeared lower as compared to the in-patient group, the day case group had higher post-operative pain scores compared to the in-patient group. Although the post-operative functional scores were similar in both groups, this was not statistically significant.
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    Anterior cruciate ligament graft orientation has been proposed as a potential mechanism for failure of single-bundle anterior cruciate ligament reconstruction and has been considered important in the restoration of normal ambulatory knee mechanics.To evaluate the possibility that patients adapt their mechanics of walking to the orientation of the anterior cruciate ligament graft. This was determined by testing the hypothesis that peak external knee flexion moment (net quadriceps moment) during walking in patients with anterior cruciate ligament reconstruction is correlated with coronal and sagittal anterior cruciate ligament graft orientations.Cross-sectional study; Level of evidence, 3.Gait analysis was performed to assess dynamic knee function during walking in 17 subjects with unilateral anterior cruciate ligament reconstructions. Magnetic resonance imaging was used to measure coronal and sagittal anterior cruciate ligament graft orientations.A negative correlation was observed between peak external knee flexion moment during walking and coronal angle of the anterior cruciate ligament graft (1.0 m/s walking speed, r = -0.87, P < .001; 1.3 m/s, r = -0.66, P = .004; 1.6 m/s, r = -0.24, P > .05); no correlation was found with the sagittal graft angle (1.0 m/s walking speed, r = 0.21, P > .05; 1.3 m/s, r = 0.20, P > .05; 1.6 m/s, r = 0.13, P > .05).The negative correlation between peak external knee flexion moment during walking and the coronal angle of the anterior cruciate ligament graft indicates that as the anterior cruciate ligament graft is placed in a more vertical coronal orientation, patients reduce their net quadriceps usage during walking.This finding supports the hypothesis that graft placement plays a critical role in the restoration of normal ambulatory mechanics after anterior cruciate ligament reconstruction and thus could provide a partial explanation for the increased incidence of premature osteoarthritis at long-term follow-up in patients with anterior cruciate ligament reconstruction.
    Knee flexion
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    Background Anatomic double-bundle reconstruction has been thought to better simulate the anterior cruciate ligament anatomy. It is, however, a technically challenging procedure, associated with longer operation time and higher cost. Hypothesis Double-bundle anterior cruciate ligament reconstruction using a single femoral and tibial tunnel can closely reproduce intact knee kinematics. Study Design Controlled laboratory study. Methods Eight fresh-frozen human cadaveric knee specimens were tested using a robotic testing system to investigate the kinematic response of the knee joint under an anterior tibial load (130 N), simulated quadriceps load (400 N), and combined torques (5 N·m valgus and 5 N·m internal tibial torques) at 0°, 15°, 30°, 60°, and 90° of flexion. Each knee was tested sequentially under 4 conditions: (1) anterior cruciate ligament intact, (2) anterior cruciate ligament deficient, (3) single-bundle anterior cruciate ligament reconstruction using quadrupled hamstring tendon, and (4) single-tunnel—double-bundle anterior cruciate ligament reconstruction using the same tunnels and quadrupled hamstring tendon graft as in the single-bundle anterior cruciate ligament reconstruction. Results Single-tunnel—double-bundle anterior cruciate ligament reconstruction more closely restored the intact knee kinematics than single-bundle anterior cruciate ligament reconstruction at low flexion angles (≤30°) under the anterior tibial load and simulated muscle load (P < .05). However, single-tunnel—double-bundle anterior cruciate ligament reconstruction overconstrained the knee joint at high flexion angles (≥60°) under the anterior tibial load and at 0° and 30° of flexion under combined torques. Conclusion This double-bundle anterior cruciate ligament reconstruction using a single tunnel can better restore anterior tibial translations to the intact level compared with single-bundle anterior cruciate ligament reconstruction at low flexion angles, but it overconstrained the knee joint at high flexion angles. Clinical Relevance This technique could be an alternative for both single-bundle and double-tunnel—double-bundle anterior cruciate ligament reconstructions to reproduce intact knee kinematics and native anterior cruciate ligament anatomy.
    Cadaveric spasm
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    Surgical management of the anterior cruciate ligament-deficient knee has evolved from primary repair to extracapsular augmentation to anterior cruciate ligament reconstruction using biologic tissue grafts. The technique of anterior cruciate ligament reconstruction has improved over the last few decades with the aid of knowledge gained from basic science and clinical research. The biology and biomechanics of anterior cruciate ligament reconstruction were analyzed in the previously published first part of this article. In this second part, current operative concepts of anterior cruciate ligament reconstruction as well as clinical correlations are discussed. The latest information regarding anterior cruciate ligament reconstruction is presented with a goal of demonstrating the correlation between the application of basic science knowledge and the improvement of clinical outcomes.
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    Anterior cruciate ligament reconstruction is performed as an outpatient procedure in selected cases. Whether it can be safely performed on a routine basis in day clinic remains unclear. Our hypothesis was that routinely performing outpatient anterior cruciate ligament reconstruction would be equally safe as compared to inpatient procedures. A cohort of 355 patients who underwent outpatient primary reconstruction was analysed at an average follow-up of 3.8 years. Four patients (1.1%) could not be discharged or were readmitted within 24 hours. The 1-month readmission rate was 1.4%. The overall complication rate was 12.1% (43 cases) of which 4.2% (15 patients) occurred within the first 30 days. Performing anterior cruciate ligament reconstructions routinely in day clinic is associated with almost negligible readmission rates and has similar complication rates as for standard in-hospital anterior cruciate ligament reconstructions. Outpatient anterior cruciate ligament reconstructions can therefore be safely performed without specific preoperative patient selection protocols.
    Outpatient clinic
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    Hamstring as a graft was very common in anterior cruciate ligament reconstruction surgery. Usually the hamstring muscles needed to be taken out and then woven to be used.In order to investigate whether it was beneficial for patients to preserve the transpedicular insertion of hamstring when using the hamstring as a graft for anterior cruciate ligament reconstruction.This was a retrospective study. Patients with anterior cruciate ligament injury who underwent surgery in a large hospital from January 2015 to May 2021 were included in the study. These patients underwent anterior cruciate ligament reconstruction assisted by arthroscopic. Autologous hamstring muscles were used as grafts. The tibial insertion of the hamstring were preserved during the operation were included in the observation group. The remaining patients were included in the control group. The knee joint function and operation of the two groups were compared.A total of 97 patients were included in the study. There was no statistical difference between the two groups in general data including gender, age and surgical side. All the patients' operations were successfully completed there was no significant difference in the operation time between the two groups. All patients were followed up for at least 1 year. No patients had complications such as wound infection and graft failure at the last follow-up. There was no significant difference between the two groups in Lysholm score and IKDC score before operation. Similarly, there was no significant difference between the two groups in Lysholm score and IKDC score 3 months after operation. However, the Lysholm score and IKDC score of the two groups 1 year after operation were statistically different, and the patients in the observation group had higher Lysholm score and IKDC score. After comparing the MRI images of the knee of the two groups 3 months after operation through the MRI evaluation system, compared with the patients in the control group, the patients in the observation group have higher scores, and the difference was statistically significant.In the knee arthroscopic assisted anterior cruciate ligament reconstruction using the hamstring as a graft, the tibial insertion of the hamstring can be preserved, which can make the patient have better function after the operation. This kind of operation leads to the increase of operation time and operation risk.
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    Arthrometry has an established role in the measurement of knee laxity in anterior cruciate ligament injury and following reconstruction. The role of routine intraoperative arthrometry in anterior cruciate ligament reconstruction is poorly defined, and this study was designed to test the hypothesis that intraoperative arthrometry provides an objective method of documenting successful knee stabilisation following anterior cruciate ligament reconstruction. A consecutive cohort of 100 patients with unilateral isolated anterior cruciate ligament disruption were prospectively evaluated using a Rolimeter arthrometer. A maximal manual force method was utilised by a single examiner. This allowed for side-to-side comparisons with the uninjured contralateral knee. Analysis of tibial translation was recorded preoperatively with patients both awake and asleep, intraoperatively following anterior cruciate ligament reconstruction, and postoperatively at 2 weeks and 3 months. Statistical analysis was performed using Spearman's correlation coefficients. Intraoperative arthrometry of anterior cruciate ligament reconstructed knees revealed statistically significant correlation with measurements of uninjured knees (p < 0.0001). These findings were reproducible at 2 weeks (p < 0.0001) and at 3 months (p = 0.0002). Based on our findings, we conclude that intraoperative arthrometry can be simple and provide reproducible results. It is a useful method of immediately and objectively documenting successful anterior cruciate ligament reconstruction.
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