The Open Orthopaedics Journal




ISSN: 1874-3250 ― Volume 13, 2019
RESEARCH ARTICLE

Anatomic Outside-In Reconstruction of the Anterior Cruciate Ligament Using Femoral Fixation with Metallic Interference Screw and Surgical Staples (Agrafe) in the Tibia: An Effective Low-Cost Technique



Ariel de Lima Diego1, 2, *, de Vasconcelos, Stemberg Martins1, 3, Leite, José Alberto Dias2, Pinto, Dilamar Moreira1, Teixeira, Rogério Beltrão1, de Léo, Álvaro Coelho1, Silveira, Leonardo de Lima1, 3, Gonçalves, Romeu Krause1, Gonçalves, Marcelo Carvalho Krause1, de Vasconcelos, Ana Carolina Leite1, Filho, Carlos Frederico Dias Costa1, de Lima, Lana Lacerda2
1 ITORK - Institute of Traumatology and Orthopedics Romeu Krause, Recife - PE, 50070-490, Brazil
2 Universidade Federal do Ceará, Fortaleza, CE Brazil
3 Hospital Armindo Moura Moreno, PE Brazil

Abstract

Background:

An anterior cruciate ligament (ACL) rupture is a frequent injury, with short and long-term consequences if left untreated. With a view to benefitting as many patients as possible and preventing future complications, we created a low-cost ligament reconstruction technique.

Method:

The present article describes an anatomic ACL reconstruction technique.

Results:

The technique involves single-band reconstruction, using flexors tendon graft, outside-in tunnel perforation, femoral fixation with metal interference screw and surgical staples (Agrafe) in the longitudinal position.

Conclusion:

We present a simple, easy-to-reproduce technique that, when executed on patients with good bone quality, primarily in the tibia, is effective and inexpensive, favoring its large scale application.

Keywords: Reconstruction, Anterior Cruciate Ligament, Low-cost, Interference Screw, Surgical Staple, Agrafe.


Article Information


Identifiers and Pagination:

Year: 2017
Volume: 11
First Page: 1154
Last Page: 1164
Publisher Id: TOORTHJ-11-1154
DOI: 10.2174/1874325001711011154

Article History:

Received Date: 12/07/2017
Revision Received Date: 02/08/2017
Acceptance Date: 12/09/2017
Electronic publication date: 31/10/2017
Collection year: 2017`

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© 2017 Diego et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the Av. Jõao da Escóssia 1300, casa 124. Cond Sun Ville. Bairro Nova Betânia. Mossoró Rio Grande do Norte 59607-330, Brazil; +55 (84)98776-2449; E-mails: arieldelima.diego@gmail.com, russas@hotmail.com





1. INTRODUCTION

Anterior cruciate ligament (ACL) rupture is one of the most common sports-related orthopedic injuries, with an annual incidence of 35 per 100,000 individuals [1Gianotti SM, Marshall SW, Hume PA, Bunt L, et al. Incidence of anterior cruciate ligament injury and other knee ligament injuries: a national population-based study. Journal of Science and Medicine in Sport 2009; 12(6): 622-7. ISSN 1440-2440
[http://dx.doi.org/10.1016/j.jsams.2008.07.005]
].

An ACL rupture can be extremely damaging in young athletes. Even in non-athletes, an untreated ACL injury can evolve into osteoarthritis of the knee in around 50% of cases in approximately 12 years, which is particularly disastrous since most of these patients are young [2Li RT, Lorenz S, Xu Y, Harner CD, Fu FH, Irrgang JJ, et al. Predictors of radiographic knee osteoarthritis after anterior cruciate ligament reconstruction. The American journal of sports medicine 2011; 39(12): 2595-603. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546511424720]
, 3Lohmander LS, Ostenberg A, Englund M, Roos H, et al. High prevalence of knee osteoarthritis, pain, and functional limitations in female soccer players twelve years after anterior cruciate ligament injury. Arthritis and Rheumatism 2004; 50(10): 3145-52. ISSN 1529-0131
[http://dx.doi.org/10.1002/art.20589]
]. Because of its high incidence, ACL rupture can be considered a public health problem, access to ligament reconstruction being essential to better serve the general public [4Mather RC III, Koenig L, Kocher MS, et al. Societal and economic impact of anterior cruciate ligament tears. J Bone Joint Surg Am 2013; 95(19): 1751-9.
[http://dx.doi.org/10.2106/JBJS.L.01705] [PMID: 24088967]
].

Generally, it is important to devise new, primarily inexpensive and effective ACL reconstruction techniques in order to preserve short and long-term knee function [5Fu FH, van Eck CF, Tashman S, Irrgang JJ, Moreland MS, et al. Anatomic anterior cruciate ligament reconstruction: a changing paradigm. Knee Surgery, Sports Traumatology, Arthroscopy 2015; 23(3): 640-8. ISSN 0942-2056
[http://dx.doi.org/10.1007/s00167-014-3209-9]
, 6Farshad M, Gerber C, Meyer DC, Schwab A, Blank PR, Szucs T, et al. Reconstruction versus conservative treatment after rupture of the anterior cruciate ligament: cost effectiveness analysis. BMC health services research 2011; 11(1): 317. ISSN 1472-6963
[http://dx.doi.org/10.1186/1472-6963-11-317]
]. Among the main factors for the high cost of the surgery in question is the choice of graft fixation material [7Archibald-Seiffer N, Jacobs JC Jr, Saad C, Jevsevar DS, Shea KG, et al. Review of anterior cruciate ligament reconstruction cost variance within a regional health care system. The American journal of sports medicine 2015; 43(6): 1408-12. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546515579184]
]. Initial fixation maintains the graft in position during biological incorporation, which takes around 12 weeks [8Mayr HO, Stoehr A, Dietrich M, et al. Graft-dependent differences in the ligamentization process of anterior cruciate ligament grafts in a sheep trial. Knee Surgery, Sports Traumatology, Arthroscopy 2012; 20(5): 947-56. ISSN 0942-2056
[http://dx.doi.org/10.1007/s00167-011-1678-7]
]. A number of fixation techniques have been used to achieve this [9Herickhoff PK, Safran MR, Yung P, Chan Kai-Ming, et al. Pros and Cons of Different ACL Graft Fixation Devices. Controversies in the Technical Aspects of ACL Reconstruction 2017; 277-88.
[http://dx.doi.org/10.1007/978-3-662-52742-9_26]
].

In the femur, fixation can be by compression (ex: interference screws), expansion (resulting from the introduction of one or two pins transverse to the femoral tunnel, bending the graft and fixing it due to pressure against the wall) or suspension (obtained cortically, with anchors or a button) [10Kousa P, Järvinen TL, Vihavainen M, Kannus P, Järvinen M, et al. The fixation strength of six hamstring tendon graft fixation devices in anterior cruciate ligament reconstruction. The American journal of sports medicine 2003; 31(2): 174-81. ISSN 0363-5465]. In the tibia, in addition to fixation by compression and expansion like the femur, cortical anchoring (ex: staples and screws) and hybrid types that use more than one fixation method simultaneously, can also be used [10Kousa P, Järvinen TL, Vihavainen M, Kannus P, Järvinen M, et al. The fixation strength of six hamstring tendon graft fixation devices in anterior cruciate ligament reconstruction. The American journal of sports medicine 2003; 31(2): 174-81. ISSN 0363-5465, 11Robert H, Seil R, Chotel F, Bonnard C, et al. Les différentes techniques de reconstruction du ligament croisé antérieur sur le genou en croissance. Revue de Chirurgie Orthopédique et Réparatrice de l'Appareil Moteur 2007; 93(6): 122-7. ISSN 0035-1040
[http://dx.doi.org/10.1016/S0035-1040(07)92724-5]
].

The aim of the present study is to describe an effective, low-cost ACL reconstruction technique, in which we performed single-band anatomic reconstruction using flexors tendon graft, outside-in tunnel perforation, femoral fixation with metallic interference screw and tibial fixation with surgical staple (Agrafe) in the longitudinal position, anchoring the graft loop (Fig. 1).

Fig. (1)
Metallic interference screw and surgical staple (Agrafe).


Fig. (2)
Patient's position.


2. TECHNIQUE

Patients are submitted to regional or general anesthesia and placed in the dorsal decubitus position, with legs hanging over the edge of the operating table and 90° knee flexion (Fig. 2). An oversleeve is used to produce ischemia, preceded by emptying with the help of an Esmarch band. A 4 cm long oblique incision is made anteromedially to the anterior tibial tuberosity to remove the semitendinosus and gracilis tendons and to construct the tibial tunnel using the outside-in technique (Fig. 3).

Fig. (3)
Incision for removal of the flexors graft.


Fig. (4)
Quadruple flexor tendon graft.


The tendons are harvested with a standard tendon stripper and prepared on an auxiliary table. The ends of the grafts are sutured with a polyester thread. The two tendons are placed side by side and folded in half, so that the four sutured ends are on one side and a loop on the other, forming a quadruple flexor tendon graft (Figs. 4 and 5).

The joint is explored arthroscopically, using an anterolateral portal for the arthroscope and an anteromedial portal for the instruments, and the medial wall of the lateral femoral condyle is prepared using a shaver and curette. Both femoral and tibial tunnels are created in an outside-in manner using a generic guide for anatomic ACL reconstruction. In the femur, we use a guide with angulation of 75º, and in the tibia, a guide of 55º and tunnel creationare preceded by the placement of guidewires (Fig. 6).

Fig. (5)
Quadruple flexor tendon graft.


Fig. (6)
Outside-in guide.


In the femoral tunnel, the arthroscope is inserted through the anteromedial portal and the guide into the anterolateral portal. Whenever possible, bony landmarks are identified, such as the bifurcate ridge and the resident’s ridge, which helps determine the femoral footprint of the ACL. The center of the tunnel is established in the region of the anteromedial ACL band, posterior to the resident’s ridge, approximately at the point between the anterior 2/3 and posterior 1/3 at the largest diameter of the condylar wall in the sagittal plane and between the superior 1/3 and inferior 2/3 of the height of the condylar wall (Fig. 7).

After identifying the center of the tunnel, the 75º guide, at the anterolateral portal, is inclined superiorly at 60º in the coronal plane and anteriorly at 30º in the sagittal plane. The entry point of the guidewire is marked on the skin and a 2cm incision is made, followed by dieresis up to the cortical bone. With the help of the guide 75º, a guidewire is placed, exiting at a point identified with the intra-articular tip of the femoral guide (Fig. 8).

Fig. (7)
The center of the femoral tunnel.


Fig. (8)
Femoral tunnel.


In the tibial tunnel, the arthroscope returns to the anterolateral portal and the guide 55º through the anteromedial portal. The guide is placed in the center of the native ACL footprint, medial and posterior to the anterior horn of the lateral meniscus. It is positioned so that the guidewire penetrates the anteromedial cortex of the tibia in the region where the incision was made to remove the flexor tendon grafts, with approximate medial inclination of 30º in the coronal plane (Fig. 9). After the tibial and femoral guidewires are inserted, knee flexion-extension is performed under arthroscopy in order to identify possible incorrect positioning of the tunnels (Fig. 10).

Fig. (9)
Tibial tunnel.


Both tunnels are then completed using a drill with the same diameter as the graft.

The graft is introduced from the caudal to the cranial, such that the loop is in the tibia and the 4 ends sutured with polyester in the femur (Fig. 11). The loop is fixed to the tibial cortex with a surgical staple (Agrafe), so that one of the “legs” of the staple is inside the loop, functioning as a post (Fig. 12), with the staple in the longitudinal position, approximately parallel to the tibial tunnel (Fig. 13). The graft is tensioned through the exit of the femoral tunnel and fixed using metallic interference screw with the same diameter as the tunnel and the maximum length that it allows (Fig. 14).

Fig. (10)
Knee flexion-extension.


Fig. (11)
Introduction of the graft.


Fig. (12)
Tibial fixation with Agrafe in the longitudinal position, anchoring the graft loop.


Fig. (13)
Tibial fixation with Agrafe in the longitudinal position, anchoring the graft loop.


Fig. (14)
Femoral fixation with metallic interference screw.


We retest flexion-extension in order to determine whether there was any blockage or loss of range of motion, and if none is detected, the incision is closed, sterile dressing is applied and no drains are used (Fig. 15).

Fig. (15)
Postoperative radiography.


3. DISCUSSION

Given that ACL rupture is a public health problem, effective low-cost techniques are important to reach a larger number of patients [12Mather Iii RC, Hettrich CM, Dunn WR, et al. Cost-effectiveness analysis of early reconstruction versus rehabilitation and delayed reconstruction for anterior cruciate ligament tears. The American journal of sports medicine 2014; 42(7): 1583-91. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546514530866]
].

In 2015, Archibald-Seiffer et al. computed the average cost, in USD, of ACL reconstruction [7Archibald-Seiffer N, Jacobs JC Jr, Saad C, Jevsevar DS, Shea KG, et al. Review of anterior cruciate ligament reconstruction cost variance within a regional health care system. The American journal of sports medicine 2015; 43(6): 1408-12. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546515579184]
]. The total cost ranged from USD 392.80 to 4670.31, with an average of USD 2039.09. The cost of tibial fixation varied between USD 95.00 and 760.00 (average of 293.52) and femoral fixation oscillated according to the technique and material used, and is less costly with the use of interference screws than button fixation [7Archibald-Seiffer N, Jacobs JC Jr, Saad C, Jevsevar DS, Shea KG, et al. Review of anterior cruciate ligament reconstruction cost variance within a regional health care system. The American journal of sports medicine 2015; 43(6): 1408-12. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546515579184]
].

With respect to the material used in interference screws, there is no statistically significant difference between clinical results in patients with metallic or bioabsorbable screws. However, the cost of using metallic screws is much lower, making them feasible for use on a large scale [13Debieux P, Franciozi CE, Lenza M, et al. Bioabsorbable versus metallic interference screws for graft fixation in anterior cruciate ligament reconstruction. Cochrane Database of Systematic Reviews 2012; (4):
[http://dx.doi.org/10.1002/14651858.CD009772]
-15Papalia R, Vasta S, D'Adamio S, Giacalone A, Maffulli N, Denaro V, et al. Metallic or bioabsorbable interference screw for graft fixation in anterior cruciate ligament (ACL) reconstruction? British medical bulletin 2013; 109(1): 19-29. ISSN 1471-8391].

Tibial fixation with surgical staples (Agrafe) is widely used as an adjuvant to another type of fixation, primarily in patients with open physes. However, in this case staples are used in the transverse position [16Lemaitre G, Salle de Chou E, Pineau V, et al. ACL reconstruction in children: a transphyseal technique. Orthopaedics and Traumatology: Surgery and Research 2014; 100(4): S261-5. ISSN 1877-0568
[http://dx.doi.org/10.1016/j.otsr.2014.03.001]
, 17Cohen M, Ferretti M, Quarteiro M, et al. Transphyseal anterior cruciate ligament reconstruction in patients with open physes. Arthroscopy: The Journal of Arthroscopic and Related Surgery 2009; 25(8): 831-8. ISSN 0749-8063
[http://dx.doi.org/10.1016/j.arthro.2009.01.015]
]. In the technique we describe, staple is placed longitudinally, using one of the “legs” to anchor the graft loop (Fig. 16). Thus, we use only one screw in the femur and only one staple in the tibia, reducing the total cost of the implants [7Archibald-Seiffer N, Jacobs JC Jr, Saad C, Jevsevar DS, Shea KG, et al. Review of anterior cruciate ligament reconstruction cost variance within a regional health care system. The American journal of sports medicine 2015; 43(6): 1408-12. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546515579184]
]. However, like the other fixation techniques using cortical anchoring, tibial fixation with surgical staple is indicated for patients with good cortical bone [10Kousa P, Järvinen TL, Vihavainen M, Kannus P, Järvinen M, et al. The fixation strength of six hamstring tendon graft fixation devices in anterior cruciate ligament reconstruction. The American journal of sports medicine 2003; 31(2): 174-81. ISSN 0363-5465, 11Robert H, Seil R, Chotel F, Bonnard C, et al. Les différentes techniques de reconstruction du ligament croisé antérieur sur le genou en croissance. Revue de Chirurgie Orthopédique et Réparatrice de l'Appareil Moteur 2007; 93(6): 122-7. ISSN 0035-1040
[http://dx.doi.org/10.1016/S0035-1040(07)92724-5]
]. In relation to the graft, Núñez et al. reported that single-band anatomic reconstruction using semitendinosus and gracilis tendons is around 20% cheaper than double-band reconstruction [18Núñez M, Sastre S, Núñez E, Lozano L, Nicodemo C, Segur JM, et al. Health-related quality of life and direct costs in patients with anterior cruciate ligament injury: single-bundle versus double-bundle reconstruction in a low-demand cohort—a randomized trial with 2 years of follow-up. Arthroscopy: The Journal of Arthroscopic and Related Surgery 2012; 28(7): 929-35. ISSN 0749-8063].

Fig. (16)
One of the “legs” of the Agrafe is inside the graft loop, functioning as a post.


In regard to the tunnel-drilling technique, Cournapeau et al. demonstrated that the all-inside procedure is 17.6% more expensive than the standard technique (tunnel perforated outside to inside in the tibia and the femur) [19Cournapeau J, Klouche S, Hardy P. Material costs of anterior cruciate ligament reconstruction with hamstring tendons by two different techniques. Orthopaedics and Traumatology: Surgery and Research 2013; 99(2): 196-201. ISSN 1877-0568
[http://dx.doi.org/10.1016/j.otsr.2012.10.013]
].

In 2014, Mall et al. conducted an epidemiological study to determine the incidence of ACL reconstruction in the United States [20Mall NA, Chalmers PN, Moric M, et al. Incidence and trends of anterior cruciate ligament reconstruction in the United States. The American journal of sports medicine 2014; 42(10): 2363-70. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546514542796]
]. The authors called attention to the growing number of ACL ruptures (especially in women, individuals younger than 20 years of age and adults over the age of 40), underscoring the importance of further research and measures to reduce costs, in order to reach the largest number of patients possible and prevent future complications [20Mall NA, Chalmers PN, Moric M, et al. Incidence and trends of anterior cruciate ligament reconstruction in the United States. The American journal of sports medicine 2014; 42(10): 2363-70. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546514542796]
]. We emphasize that this is not an unprecedented technique. There are similar techniques. However, we intend to disclose it because of its importance.

In Brazil, this technique was widely divulged by the authors Pinto and Vasconcelos. Our team has already performed more than 400 ACL reconstructions with this technique. In the future we intend to publish the results in the long term.

CONCLUSION

Due to the increasing number of ACL injuries, low-cost reconstruction techniques are essential. In the present study we present a simple, easy-to-reproduce technique that is effective and inexpensive when applied to patients with good bone quality, primarily in the tibia, making it feasible for large-scale use.

ETHICS APPROVAL AND CONSENT TO PARTICIPATE

This article does not contain any studies with human participants or animals performed by any of the authors.

HUMAN AND ANIMAL RIGHTS

No Animals/Humans were used for studies that are base of this research.

CONSENT FOR PUBLICATION

Not applicable.

CONFLICT OF INTEREST

The authors declare no conflict of interest, financial or otherwise.

ACKNOWLEDGEMENTS

Declared none.

REFERENCES

[1] Gianotti SM, Marshall SW, Hume PA, Bunt L, et al. Incidence of anterior cruciate ligament injury and other knee ligament injuries: a national population-based study. Journal of Science and Medicine in Sport 2009; 12(6): 622-7. ISSN 1440-2440
[http://dx.doi.org/10.1016/j.jsams.2008.07.005]
[2] Li RT, Lorenz S, Xu Y, Harner CD, Fu FH, Irrgang JJ, et al. Predictors of radiographic knee osteoarthritis after anterior cruciate ligament reconstruction. The American journal of sports medicine 2011; 39(12): 2595-603. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546511424720]
[3] Lohmander LS, Ostenberg A, Englund M, Roos H, et al. High prevalence of knee osteoarthritis, pain, and functional limitations in female soccer players twelve years after anterior cruciate ligament injury. Arthritis and Rheumatism 2004; 50(10): 3145-52. ISSN 1529-0131
[http://dx.doi.org/10.1002/art.20589]
[4] Mather RC III, Koenig L, Kocher MS, et al. Societal and economic impact of anterior cruciate ligament tears. J Bone Joint Surg Am 2013; 95(19): 1751-9.
[http://dx.doi.org/10.2106/JBJS.L.01705] [PMID: 24088967]
[5] Fu FH, van Eck CF, Tashman S, Irrgang JJ, Moreland MS, et al. Anatomic anterior cruciate ligament reconstruction: a changing paradigm. Knee Surgery, Sports Traumatology, Arthroscopy 2015; 23(3): 640-8. ISSN 0942-2056
[http://dx.doi.org/10.1007/s00167-014-3209-9]
[6] Farshad M, Gerber C, Meyer DC, Schwab A, Blank PR, Szucs T, et al. Reconstruction versus conservative treatment after rupture of the anterior cruciate ligament: cost effectiveness analysis. BMC health services research 2011; 11(1): 317. ISSN 1472-6963
[http://dx.doi.org/10.1186/1472-6963-11-317]
[7] Archibald-Seiffer N, Jacobs JC Jr, Saad C, Jevsevar DS, Shea KG, et al. Review of anterior cruciate ligament reconstruction cost variance within a regional health care system. The American journal of sports medicine 2015; 43(6): 1408-12. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546515579184]
[8] Mayr HO, Stoehr A, Dietrich M, et al. Graft-dependent differences in the ligamentization process of anterior cruciate ligament grafts in a sheep trial. Knee Surgery, Sports Traumatology, Arthroscopy 2012; 20(5): 947-56. ISSN 0942-2056
[http://dx.doi.org/10.1007/s00167-011-1678-7]
[9] Herickhoff PK, Safran MR, Yung P, Chan Kai-Ming, et al. Pros and Cons of Different ACL Graft Fixation Devices. Controversies in the Technical Aspects of ACL Reconstruction 2017; 277-88.
[http://dx.doi.org/10.1007/978-3-662-52742-9_26]
[10] Kousa P, Järvinen TL, Vihavainen M, Kannus P, Järvinen M, et al. The fixation strength of six hamstring tendon graft fixation devices in anterior cruciate ligament reconstruction. The American journal of sports medicine 2003; 31(2): 174-81. ISSN 0363-5465
[11] Robert H, Seil R, Chotel F, Bonnard C, et al. Les différentes techniques de reconstruction du ligament croisé antérieur sur le genou en croissance. Revue de Chirurgie Orthopédique et Réparatrice de l'Appareil Moteur 2007; 93(6): 122-7. ISSN 0035-1040
[http://dx.doi.org/10.1016/S0035-1040(07)92724-5]
[12] Mather Iii RC, Hettrich CM, Dunn WR, et al. Cost-effectiveness analysis of early reconstruction versus rehabilitation and delayed reconstruction for anterior cruciate ligament tears. The American journal of sports medicine 2014; 42(7): 1583-91. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546514530866]
[13] Debieux P, Franciozi CE, Lenza M, et al. Bioabsorbable versus metallic interference screws for graft fixation in anterior cruciate ligament reconstruction. Cochrane Database of Systematic Reviews 2012; (4):
[http://dx.doi.org/10.1002/14651858.CD009772]
[14] Mascarenhas R, Saltzman BM, Sayegh ET, et al. Bioabsorbable versus metallic interference screws in anterior cruciate ligament reconstruction: a systematic review of overlapping meta-analyses. Arthroscopy: The Journal of Arthroscopic and Related Surgery 2015; 31(3): 561-8. ISSN 0749-8063
[http://dx.doi.org/10.1016/j.arthro.2014.11.011]
[15] Papalia R, Vasta S, D'Adamio S, Giacalone A, Maffulli N, Denaro V, et al. Metallic or bioabsorbable interference screw for graft fixation in anterior cruciate ligament (ACL) reconstruction? British medical bulletin 2013; 109(1): 19-29. ISSN 1471-8391
[16] Lemaitre G, Salle de Chou E, Pineau V, et al. ACL reconstruction in children: a transphyseal technique. Orthopaedics and Traumatology: Surgery and Research 2014; 100(4): S261-5. ISSN 1877-0568
[http://dx.doi.org/10.1016/j.otsr.2014.03.001]
[17] Cohen M, Ferretti M, Quarteiro M, et al. Transphyseal anterior cruciate ligament reconstruction in patients with open physes. Arthroscopy: The Journal of Arthroscopic and Related Surgery 2009; 25(8): 831-8. ISSN 0749-8063
[http://dx.doi.org/10.1016/j.arthro.2009.01.015]
[18] Núñez M, Sastre S, Núñez E, Lozano L, Nicodemo C, Segur JM, et al. Health-related quality of life and direct costs in patients with anterior cruciate ligament injury: single-bundle versus double-bundle reconstruction in a low-demand cohort—a randomized trial with 2 years of follow-up. Arthroscopy: The Journal of Arthroscopic and Related Surgery 2012; 28(7): 929-35. ISSN 0749-8063
[19] Cournapeau J, Klouche S, Hardy P. Material costs of anterior cruciate ligament reconstruction with hamstring tendons by two different techniques. Orthopaedics and Traumatology: Surgery and Research 2013; 99(2): 196-201. ISSN 1877-0568
[http://dx.doi.org/10.1016/j.otsr.2012.10.013]
[20] Mall NA, Chalmers PN, Moric M, et al. Incidence and trends of anterior cruciate ligament reconstruction in the United States. The American journal of sports medicine 2014; 42(10): 2363-70. ISSN 0363-5465
[http://dx.doi.org/10.1177/0363546514542796]

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Sean L. Kitson
(Almac Sciences, Northern Ireland)

"In principle, all scientific journals should have open access, as should be science itself. Open access journals are very helpful for students, researchers and the general public including people from institutions which do not have library or cannot afford to subscribe scientific journals. The articles are high standard and cover a wide area."


Hubert Wolterbeek
(Delft University of Technology, The Netherlands)

"The widest possible diffusion of information is critical for the advancement of science. In this perspective, open access journals are instrumental in fostering researches and achievements."


Alessandro Laviano
(Sapienza - University of Rome, Italy)

"Open access journals are very useful for all scientists as they can have quick information in the different fields of science."


Philippe Hernigou
(Paris University, France)

"There are many scientists who can not afford the rather expensive subscriptions to scientific journals. Open access journals offer a good alternative for free access to good quality scientific information."


Fidel Toldrá
(Instituto de Agroquimica y Tecnologia de Alimentos, Spain)

"Open access journals have become a fundamental tool for students, researchers, patients and the general public. Many people from institutions which do not have library or cannot afford to subscribe scientific journals benefit of them on a daily basis. The articles are among the best and cover most scientific areas."


M. Bendandi
(University Clinic of Navarre, Spain)

"These journals provide researchers with a platform for rapid, open access scientific communication. The articles are of high quality and broad scope."


Peter Chiba
(University of Vienna, Austria)

"Open access journals are probably one of the most important contributions to promote and diffuse science worldwide."


Jaime Sampaio
(University of Trás-os-Montes e Alto Douro, Portugal)

"Open access journals make up a new and rather revolutionary way to scientific publication. This option opens several quite interesting possibilities to disseminate openly and freely new knowledge and even to facilitate interpersonal communication among scientists."


Eduardo A. Castro
(INIFTA, Argentina)

"Open access journals are freely available online throughout the world, for you to read, download, copy, distribute, and use. The articles published in the open access journals are high quality and cover a wide range of fields."


Kenji Hashimoto
(Chiba University, Japan)

"Open Access journals offer an innovative and efficient way of publication for academics and professionals in a wide range of disciplines. The papers published are of high quality after rigorous peer review and they are Indexed in: major international databases. I read Open Access journals to keep abreast of the recent development in my field of study."


Daniel Shek
(Chinese University of Hong Kong, Hong Kong)

"It is a modern trend for publishers to establish open access journals. Researchers, faculty members, and students will be greatly benefited by the new journals of Bentham Science Publishers Ltd. in this category."


Jih Ru Hwu
(National Central University, Taiwan)


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