Biomechanical Comparison of Cross-Pin and Endobutton-CL Femoral Fixation of a Flexor Tendon Graft for Anterior Cruciate Ligament Reconstruction-A Porcine Femur-Graft-Tibia Complex Study

Hsain Chung Shen, Jen Huei Chang, Chian-Her Lee, Pei Hung Shen, Tsu Te Yeh, Chia Chun Wu, Chun Lin Kuo

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Background: A stable fixation of the graft is imperative for early aggressive rehabilitation after anterior cruciate ligament (ACL) reconstruction. The suspension devices such as Endobutton-CL and Cross-pin system are common techniques of femoral fixation for the hamstring tendon graft and provide superior initial biomechanical properties than the screws system. It remains unclear how such implants perform under cyclic loading and initial pull-out strength. Materials and Methods: Cross-pin and Endobutton-CL femoral fixation devices were tested for initial fixation strength in porcine knee joints by cyclic loads following a load-to-failure test. The Cross-pin and Endobutton-CL were used for femoral fixation of a porcine profundus flexor digitorum tendon autograft in 20 porcine knees. Ten specimens of femoral-graft-tibia complex in each group were loaded cyclically to between 0 and 150 N at 1 Hz for 1000 cycles following a load-to-failure test at a rate of 150 mm/min. Results: The amount of total femur-graft-tibia complex graft displacement was significantly lower in the Cross-pin fixation group (5.37 ± 0.28 mm) than in Endobutton-CL fixation group (6.08 ± 0.61 mm: P <0.05). There were no significant differences in the maximal failure load, yield load, and stiffness between the Cross-pin and Endobutton-CL fixation groups. Conclusions: This biomechanical study reveals that the Endobutton-CL and Cross-pin femoral fixation devices have an equally strong and safe fixation for ACL reconstruction. However, the Cross-pin fixation has significantly less displacement of femur-graft-tibia complex than that of Endobutton-CL fixation in response to the cyclic loading test. It indicates that the Cross-pin fixation is more suitable for early aggressive rehabilitation following ACL reconstruction. Crown

Original languageEnglish
Pages (from-to)282-287
Number of pages6
JournalJournal of Surgical Research
Volume161
Issue number2
DOIs
Publication statusPublished - Jun 15 2010

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Anterior Cruciate Ligament Reconstruction
Thigh
Tibia
Tendons
Femur
Swine
Transplants
Equipment and Supplies
Rehabilitation
Autografts
Knee Joint
Crowns
Knee
Suspensions

Keywords

  • ACL reconstruction
  • biomechanical test
  • fixation
  • tendon graft

ASJC Scopus subject areas

  • Surgery

Cite this

Biomechanical Comparison of Cross-Pin and Endobutton-CL Femoral Fixation of a Flexor Tendon Graft for Anterior Cruciate Ligament Reconstruction-A Porcine Femur-Graft-Tibia Complex Study. / Shen, Hsain Chung; Chang, Jen Huei; Lee, Chian-Her; Shen, Pei Hung; Yeh, Tsu Te; Wu, Chia Chun; Kuo, Chun Lin.

In: Journal of Surgical Research, Vol. 161, No. 2, 15.06.2010, p. 282-287.

Research output: Contribution to journalArticle

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title = "Biomechanical Comparison of Cross-Pin and Endobutton-CL Femoral Fixation of a Flexor Tendon Graft for Anterior Cruciate Ligament Reconstruction-A Porcine Femur-Graft-Tibia Complex Study",
abstract = "Background: A stable fixation of the graft is imperative for early aggressive rehabilitation after anterior cruciate ligament (ACL) reconstruction. The suspension devices such as Endobutton-CL and Cross-pin system are common techniques of femoral fixation for the hamstring tendon graft and provide superior initial biomechanical properties than the screws system. It remains unclear how such implants perform under cyclic loading and initial pull-out strength. Materials and Methods: Cross-pin and Endobutton-CL femoral fixation devices were tested for initial fixation strength in porcine knee joints by cyclic loads following a load-to-failure test. The Cross-pin and Endobutton-CL were used for femoral fixation of a porcine profundus flexor digitorum tendon autograft in 20 porcine knees. Ten specimens of femoral-graft-tibia complex in each group were loaded cyclically to between 0 and 150 N at 1 Hz for 1000 cycles following a load-to-failure test at a rate of 150 mm/min. Results: The amount of total femur-graft-tibia complex graft displacement was significantly lower in the Cross-pin fixation group (5.37 ± 0.28 mm) than in Endobutton-CL fixation group (6.08 ± 0.61 mm: P <0.05). There were no significant differences in the maximal failure load, yield load, and stiffness between the Cross-pin and Endobutton-CL fixation groups. Conclusions: This biomechanical study reveals that the Endobutton-CL and Cross-pin femoral fixation devices have an equally strong and safe fixation for ACL reconstruction. However, the Cross-pin fixation has significantly less displacement of femur-graft-tibia complex than that of Endobutton-CL fixation in response to the cyclic loading test. It indicates that the Cross-pin fixation is more suitable for early aggressive rehabilitation following ACL reconstruction. Crown",
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AU - Shen, Hsain Chung

AU - Chang, Jen Huei

AU - Lee, Chian-Her

AU - Shen, Pei Hung

AU - Yeh, Tsu Te

AU - Wu, Chia Chun

AU - Kuo, Chun Lin

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N2 - Background: A stable fixation of the graft is imperative for early aggressive rehabilitation after anterior cruciate ligament (ACL) reconstruction. The suspension devices such as Endobutton-CL and Cross-pin system are common techniques of femoral fixation for the hamstring tendon graft and provide superior initial biomechanical properties than the screws system. It remains unclear how such implants perform under cyclic loading and initial pull-out strength. Materials and Methods: Cross-pin and Endobutton-CL femoral fixation devices were tested for initial fixation strength in porcine knee joints by cyclic loads following a load-to-failure test. The Cross-pin and Endobutton-CL were used for femoral fixation of a porcine profundus flexor digitorum tendon autograft in 20 porcine knees. Ten specimens of femoral-graft-tibia complex in each group were loaded cyclically to between 0 and 150 N at 1 Hz for 1000 cycles following a load-to-failure test at a rate of 150 mm/min. Results: The amount of total femur-graft-tibia complex graft displacement was significantly lower in the Cross-pin fixation group (5.37 ± 0.28 mm) than in Endobutton-CL fixation group (6.08 ± 0.61 mm: P <0.05). There were no significant differences in the maximal failure load, yield load, and stiffness between the Cross-pin and Endobutton-CL fixation groups. Conclusions: This biomechanical study reveals that the Endobutton-CL and Cross-pin femoral fixation devices have an equally strong and safe fixation for ACL reconstruction. However, the Cross-pin fixation has significantly less displacement of femur-graft-tibia complex than that of Endobutton-CL fixation in response to the cyclic loading test. It indicates that the Cross-pin fixation is more suitable for early aggressive rehabilitation following ACL reconstruction. Crown

AB - Background: A stable fixation of the graft is imperative for early aggressive rehabilitation after anterior cruciate ligament (ACL) reconstruction. The suspension devices such as Endobutton-CL and Cross-pin system are common techniques of femoral fixation for the hamstring tendon graft and provide superior initial biomechanical properties than the screws system. It remains unclear how such implants perform under cyclic loading and initial pull-out strength. Materials and Methods: Cross-pin and Endobutton-CL femoral fixation devices were tested for initial fixation strength in porcine knee joints by cyclic loads following a load-to-failure test. The Cross-pin and Endobutton-CL were used for femoral fixation of a porcine profundus flexor digitorum tendon autograft in 20 porcine knees. Ten specimens of femoral-graft-tibia complex in each group were loaded cyclically to between 0 and 150 N at 1 Hz for 1000 cycles following a load-to-failure test at a rate of 150 mm/min. Results: The amount of total femur-graft-tibia complex graft displacement was significantly lower in the Cross-pin fixation group (5.37 ± 0.28 mm) than in Endobutton-CL fixation group (6.08 ± 0.61 mm: P <0.05). There were no significant differences in the maximal failure load, yield load, and stiffness between the Cross-pin and Endobutton-CL fixation groups. Conclusions: This biomechanical study reveals that the Endobutton-CL and Cross-pin femoral fixation devices have an equally strong and safe fixation for ACL reconstruction. However, the Cross-pin fixation has significantly less displacement of femur-graft-tibia complex than that of Endobutton-CL fixation in response to the cyclic loading test. It indicates that the Cross-pin fixation is more suitable for early aggressive rehabilitation following ACL reconstruction. Crown

KW - ACL reconstruction

KW - biomechanical test

KW - fixation

KW - tendon graft

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