scholarly journals Tendon grafts with preserved muscle demonstrate similar biomechanical properties to tendon grafts stripped of muscular attachments: a biomechanical evaluation in a porcine model

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Luis Fernando Zukanovich Funchal ◽  
Diego Costa Astur ◽  
André Luiz Almeida Pizzolatti ◽  
Arthur Paiva Grimaldi ◽  
Andrew Esteban Jimenez ◽  
...  
Keyword(s):  
Muscle Tissue ◽  
Porcine Model ◽  
Testing Machine ◽  
Maximum Load ◽  
Biomechanical Properties ◽  
Tendon Graft ◽  
Flexor Digitorum Superficialis ◽  
Yield Load ◽  
Tendon Grafts ◽  
Flexor Digitorum

Abstract Purpose (1) To evaluate the biomechanical properties of a porcine flexor digitorum superficialis tendon graft with preserved muscle fibers and (2) to compare these results with the biomechanical properties of a porcine tendon graft after removal of associated muscle. Methods Eighty-two porcine forelegs were dissected and the flexor digitorum superficialis muscle tendons were harvested. The study comprised of two groups: Group 1 (G1), harvested tendon with preserved muscle tissue; and Group 2 (G2), harvested contralateral tendon with removal of all muscle tissue. Tests in both groups were conducted using an electro-mechanical material testing machine (Instron, model 23-5S, Instron Corp., Canton, MA, USA) with a 500 N force transducer. Yield load, stiffness, and maximum load were evaluated and compared between groups. Results The behavior of the autografts during the tests followed the same stretching, deformation, and failure patterns as those observed in human autografts subjected to axial strain. There were no significant differences in the comparison between groups for ultimate load to failure (p = 0.105), stiffness (p = 0.097), and energy (p = 0.761). Conclusion In this porcine model biomechanical study, using autograft tendon with preserved muscle showed no statistically significant differences for yield load, stiffness, or maximum load compared to autograft tendon without preserved muscle. The preservation of muscle on the autograft tendon did not compromise the mechanical properties of the autograft. Level of evidence Level III Controlled laboratory study

scholarly journals Biomechanical properties of a novel biodegradable magnesium-based interference screw

2016 ◽  
Vol 8 (2) ◽  
Author(s):  
Marco Ezechieli ◽  
Hanna Meyer ◽  
Arne Lucas ◽  
Patrick Helmecke ◽  
Christoph Becher ◽  
...  
Keyword(s):  
Cruciate Ligament ◽  
Testing Machine ◽  
Biomechanical Testing ◽  
Maximum Load ◽  
Biomechanical Properties ◽  
Interference Screw ◽  
Biomechanical Analysis ◽  
Interference Screws ◽  
Standard Implant ◽  
Biodegradable Magnesium

Magnesium-based interference screws may be an alternative in anterior/posterior cruciate ligament reconstruction. The well-known osteoconductive effects of biodegradable magnesium alloys may be useful. It was the purpose of this study to evaluate the biomechanical properties of a magnesium based interference screw and compare it to a standard implant. A MgYREZr-alloy interference screw and a standard implant (Milagro®; De Puy Mitek, Raynham, MA, USA) were used for graft fixation. Specimens were placed into a tensile loading fixation of a servohydraulic testing machine. Biomechanical analysis included pretensioning of the constructs at 20 N for 1 min following cyclic pretensioning of 20 cycles between 20 and 60 N. Biomechanical elongation was evaluated with cyclic loading of 1000 cycles between 50 and 200 N at 0.5 Hz. Maximum load to failure was 511.3±66.5 N for the Milagro® screw and 529.0±63.3 N for magnesium-based screw (ns, P=0.57). Elongations after preload, during cyclical loading and during failure load were not different between the groups (ns, P>0.05). Stiffness was 121.1±13.8 N/mm for the magnesiumbased screw and 144.1±18.4 for the Milagro® screw (ns, P=0.32). MgYREZr alloy interference screws show comparable results in biomechanical testing to standard implants and may be an alternative for anterior cruciate reconstruction in the future.

Comparative Study of Biomechanical Properties between Needled Suture and Needleless Suture in Multi-Strand Tendon Graft Model

2021 ◽  
Vol 104 (9) ◽  
pp. 1447-1451
Keyword(s):  
Testing Machine ◽  
Biomechanical Properties ◽  
Tendon Graft ◽  
Suture Technique ◽  
Biomechanical Study ◽  
Modes Of Failure ◽  
Tendon Elongation ◽  
Significant Difference ◽  
Load To Failure ◽  
Distraction Force

Objective: To compare the biomechanical properties of the Chinese finger (CF) suture, a needleless suture technique, with the baseball stitch (BS) suture, a needled suture technique, in a multi-strand model by using a 4-strand tendon model. Additionally, the BS was compared with the serial rolling hitch (RH), a locking needleless suture technique. Materials and Methods: 4-strand grafts, made from two 20-cm fresh porcine toe extensors, were used in all three groups. After the grafts were sutured, pretension was applied with a load of 100-N distraction force for five minutes. After the tendon elongation was measured before and after the pretension, the distraction force was continued until the constructed graft failed. Stress-strain relationship graphs were recorded by universal testing machine (UTM), distributing to the calculation of percentage on tendon elongation, stiffness, and load-to-failure. Results: The BS had significantly higher load of failure than the CF (p=0.001) but no significant difference when compared with the RH. Comparing between BS, CF, and RH, there were no significant difference in stiffness and percentage of tendon elongation. In modes of failure, there was evidence of knot slipping in CF in six of six cases and graft strangulation in RH in four of six cases. Conclusion: Multi-strand model BS, a needled suture, had a higher load to failure than CF, a needleless suture. Moreover, needleless sutures had serious modes of failure, which were knot slipping and strangulation of graft by the suture material. Therefore, needleless suture technique for multi-strand tendon graft preparation was not recommended. Keywords: Tendon preparation; Multi-Strand; Needled suture; Needleless suture; Chinese finger; Baseball stitch; Rolling Hitch; Biomechanical study; Graft elongation; Load to failure

scholarly journals Sternoclavicular Joint Reconstruction Fracture Risk Is Reduced With Straight Drill Tunnels and Optimized With Tendon Graft Suture Augmentation

2019 ◽  
Vol 7 (4) ◽  
pp. 232596711983826 ◽  
Author(s):  
Frank Martetschläger ◽  
Franziska Reifenschneider ◽  
Nicole Fischer ◽  
Coen A. Wijdicks ◽  
Peter J. Millett ◽  
...  
Keyword(s):  
Testing Machine ◽  
Primary Stability ◽  
Biomechanical Properties ◽  
Tendon Graft ◽  
Sternoclavicular Joint ◽  
Graft Material ◽  
Load To Failure ◽  
Posterior Translation ◽  
Drill Holes ◽  
Suture Tape

Background: Despite the rare entity of sternoclavicular joint (SCJ) instability, a variety of different reconstruction techniques for SCJ dislocations have been described. A technique with oblique drilling has been proposed to reduce intraoperative risks. Purpose: To biomechanically investigate different cerclage reconstruction techniques and the benefit of additional reinforcement using suture tape. Study Design: Controlled laboratory study. Methods: Reconstructed artificial bone specimens were mounted on a mechanical testing machine. They were subjected to anterior and posterior translation, analyzing ultimate strength, displacement, stiffness, and elongation. For stage 1, different angulations of the drill tunnels through the sternum and clavicle were compared. Straight drill tunnels from anterior to posterior were compared with 45° oblique drill tunnels. For stage 2, three different materials for cerclage reconstruction were compared: (1) suture tape alone (FT group), (2) tendon graft alone (tendon group), and (3) tendon graft with suture tape augmentation (tendon+FT group). Results: For the FT group, in the anterior and posterior directions, straight drill holes resulted in a significantly higher load to failure (936.9 ± 122.5 N) compared with oblique ones (434.5 ± 20.2 N) ( P < .0001). During cyclic testing, all specimens with straight drill holes survived the 5- to 550-N step, while all specimens with oblique ones failed during the 5- to 450-N step. Analyzing the graft material choice, the mean load to failure was 556.6 ± 174.3 N for the tendon group, 936.9 ± 122.5 N for the FT group, and 767.0 ± 110.7 N for the tendon+FT group ( P = .089). The stiffness of the tendon+FT group was significantly lower than that of the FT group and significantly higher than that of the tendon group. Conclusion: Oblique tunnel placement during SCJ reconstruction, while reducing the intraoperative risk, results in decreased primary stability of the construct. Tendon graft reconstruction with suture tape augmentation leads to enhanced stability and optimizes biomechanical properties of the construct. Clinical Relevance: The surgical technique with straight drill holes has superior initial biomechanical properties and may likewise produce superior clinical outcomes in the treatment of SCJ instability. Suture tape augmentation can provide additional stability to reconstruction procedures.

TREATMENT OF CONGENITAL SWAN NECK DEFORMITY WITH DYNAMIC TENODESIS OF PROXIMAL INTERPHALANGEAL JOINT

2001 ◽  
Vol 26 (2) ◽  
pp. 165-167 ◽  
Author(s):  
V. SMRÈKA ◽  
I. DYLEVSKÝ
Keyword(s):  
Tendon Transfer ◽  
Tendon Graft ◽  
Proximal Interphalangeal Joint ◽  
Interphalangeal Joint ◽  
Flexor Digitorum Superficialis ◽  
Middle Phalanx ◽  
Flexor Digitorum ◽  
Swan Neck Deformity

Congenital swan neck deformities in seven fingers of two patients were treated by transfer of the flexor digitorum superficialis tendon to a tendon graft which was attached the extensor aponeurosis over the middle phalanx. The tendon transfer is protected for at least 2 months by a modified Murphy splint.

Flexor Digitorum Superficialis Tendon Sling Volar Plate Reconstruction for Swan-Neck Deformity in the Spastic Finger

2017 ◽  
Vol 22 (02) ◽  
pp. 251-254
Author(s):  
Y.L. Tan ◽  
F.C. Yong
Keyword(s):  
Tendon Graft ◽  
Proximal Interphalangeal Joint ◽  
Volar Plate ◽  
Safe Procedure ◽  
Flexor Digitorum Superficialis ◽  
Reconstruction Procedure ◽  
Sling Procedure ◽  
Flexor Digitorum ◽  
Plate Reconstruction ◽  
Swan Neck Deformity

The condition of proximal interphalangeal joint (PIPJ) locking in hyperextension may occur in the athetoid or spastic hand with moderate or severe swan-neck deformity at the ‘opening’ phase of prehension. The patient’s complaints are of complete or incomplete locking that may require passive assistance to initiate PIPJ flexion. Surgical procedures to overcome this include rerouting the lateral band, stabilisation or reconstruction procedure for the volar instability of the PIPJ, etc. Volar stabilisation may be achieved by Flexor digitorum superficialis (FDS) tenodesis procedures or criss-cross tendon graft for volar plate reconstruction. We report a case of successful stabilisation using the criss-cross tendon sling procedure for volar plate reconstruction using a slip of the FDS tendon instead of a free tendon graft. This is a simple and safe procedure that effectively corrects the swan-neck deformity and improves the prehension function in the hand.

The Length Of Flexor Tendon Grafts

HAND ◽  
1978 ◽  
Vol os-10 (1) ◽  
pp. 48-51 ◽  
Author(s):  
B. J. Mayou ◽  
S. H. Harrison
Keyword(s):  
Flexor Tendon ◽  
Standard Technique ◽  
Tendon Graft ◽  
Flexor Digitorum Profundus ◽  
Lumbrical Muscle ◽  
Tendon Grafts ◽  
Flexor Digitorum ◽  
Flexor Digitorum Profundus Tendon

Summary The distance between the origin of the lumbrical muscle and the insertion of the flexor digitorum profundus tendon was measured at surgery in forty-eight patients. It was found that this distance was predictable and could be estimated without measurement prior to operation. A standard technique of flexor tendon grafting is described where this distance equals the length of the tendon graft.

Early Active Mobilization of Tendon Grafts Using Mesh Reinforced Suture Techniques

1995 ◽  
Vol 20 (3) ◽  
pp. 301-307 ◽  
Author(s):  
K. L. SILFVERSKIÖLD ◽  
E. J. MAY
Keyword(s):  
Alcohol Intoxication ◽  
Tendon Graft ◽  
Proximal Interphalangeal Joint ◽  
Flexor Digitorum Profundus ◽  
Longus Tendon ◽  
Palmaris Longus ◽  
Active Mobilization ◽  
Palmaris Longus Tendon ◽  
Tendon Grafts ◽  
Flexor Digitorum

The flexor digitorum profundus tendon in 11 digits with division of both flexor tendons in zone 2 was reconstructed with a palmaris longus tendon graft in a two-stage procedure. The distal and proximal fixation of the graft was reinforced with a polyester mesh sleeve placed around the ends of the graft during stage 1. All digits were mobilized with a combination of active extension and active and passive flexion within 3 days of the second stage. There were three ruptures, one due to faulty technique and two due to falls on outstretched hands during alcohol intoxication and football. Excluding the ruptures, the mean active composite distal and proximal interphalangeal joint range of motion 6 weeks and 6 months post-operatively was 141° and 136° respectively. The results indicate that palmaris longus tendon grafts can survive and heal during early active mobilization, with few or no adhesions of functional significance. The techniques described here represent one possible approach to the safe implementation of early active mobilization after tendon grafting procedures.

Biomechanical comparison of pin and nitinol bone staple fixation to pin and tension band wire fixation for the stabilization of canine olecranon osteotomies

2017 ◽  
Vol 30 (05) ◽  
pp. 324-330 ◽  
Author(s):  
Chris Christou ◽  
Craig Bailey ◽  
Chris Tan ◽  
John Culvenor ◽  
Tian Wang ◽  
...  
Keyword(s):  
Clinical Investigation ◽  
Maximum Load ◽  
Biomechanical Properties ◽  
Axial Displacement ◽  
Tension Band ◽  
Yield Load ◽  
Tension Band Wire ◽  
Wire Fixation ◽  
Load To Failure ◽  
Staple Fixation

SummaryObjective: To compare the initial biomechanical properties of olecranon osteotomies stabilized with intramedullary pins and a Nitinol bone staple to osteotomies stabilized with pin and tension band wire fixation.Study design: Ex vivo mechanical evaluation on cadaveric bones.Material and methods: Ten pairs of cadaveric forelimbs from skeletally mature Greyhounds with an olecranon osteotomy stabilized with either a pin and Nitinol bone staple or a pin and tension band wire. A single load to failure was applied to each specimen through the triceps tendon. Biomechanical properties were compared based on stiffness, yield load, and maximum load to failure and load at 2 mm of axial displacement.Results: Specimens stabilized with the bone staple were biomechanically superior in all the variables tested. There was significantly greater stiffness (118.0 ± 25.9 N/mm versus 70.1 ± 40.4 N/mm; p = 0.005), yield load (319.0 ± 99.8 N versus 238.0 ± 42.5 N; p = 0.03), maximum load sustained (385.0 ± 99.2 N versus 287.0 ± 37.4 N; p = 0.009), and load at 2 mm of axial displacement (218.0 ± 51.5 N versus 138.0 ± 48.7 N; p = 0.002) in specimens stabilized with pins and a Nitinol bone staple than specimens stabilized with pin and tension band wire fixation.Clinical significance: The pin and Nitinol bone staple construct provides a biomechanically superior alternative to pin and tension band wire fixation for stabilization of olecranon osteotomies, and its use warrants further clinical investigation.Supplementary material for this article is available at https://doi.org/10.3415/VCOT-17-02-0025

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