scholarly journals Effect of difference in fixation methods of tendon graft and the microfracture procedure on tendon-bone junction healing

2021 ◽  
Author(s):  
Satoshi Nezu ◽  
Taichi Saito ◽  
Aki Yoshida ◽  
Shinji Narazaki ◽  
Yasunori Shimamura ◽  
...  
Keyword(s):  
Tendon Graft ◽  
Fixation Methods

scholarly journals Stiffness characteristics of hamstring tendon graft fixation methods at the femoral site

2004 ◽  
Vol 29 (1) ◽  
pp. 35-38 ◽  
Author(s):  
D. Benfield ◽  
D. D. Otto ◽  
K. M. Bagnall ◽  
V. J. Raso ◽  
W. Moussa ◽  
...  
Keyword(s):  
Hamstring Tendon ◽  
Tendon Graft ◽  
Graft Fixation ◽  
Hamstring Tendon Graft ◽  
Fixation Methods ◽  
Femoral Site ◽  
Stiffness Characteristics

scholarly journals Primary fixation strength of patellar fixation methods for medial patellofemoral ligament reconstruction in a porcine model

2020 ◽  
Vol 8 (5_suppl4) ◽  
pp. 2325967120S0031
Author(s):  
Stephan Reppenhagen ◽  
Manuel Weißenberger ◽  
Christiane Löffler ◽  
Thomas Barthel
Keyword(s):  
Medial Patellofemoral Ligament ◽  
Tendon Graft ◽  
Fixation Strength ◽  
Absorbable Suture ◽  
Yield Load ◽  
Fixation Methods ◽  
Native Tissue ◽  
Group 5 ◽  
Group 2 ◽  
Group 1

Aims and Objectives: The reconstruction of the medial patellofemoral ligament (MPFL) with autologous tendon grafts is an established method for stabilisation of the patella in case of recurrent instability. There are several operative techniques described in literature that differ i.a. in their patellar fixation methods. Techniques with transpatellar drilling show higher complication rates, the use of anchors or interference screws lead to additional costs. Soft tissue fixation methods have also been described but there is a lack of biomechanical data. The aim of this study is to test biomechanical properties of implantfree patellar fixation methods. Materials and Methods: We used a porcine patella model for biomechanical testing. From 60 domestic pigs patellae and extensor tendons were harvested and randomized to 6 test groups. One test group (n = 10) was used to measure primary stability of the native tissue. In the other five groups different patellar fixation methods were examined (n = 10). In two groups the free tendon graft was interlaced in a u-typed manner and fixed with absorbable suture USP 0 (group 1: fixation with four sutures, group 2: fixation with three parallel sutures). In two groups the free tendon graft was fixed with a transosseous suture USP 0 (group 3) and with non-absorbable suture USP 3 (group 4). In group 5 fixation was performed with a v-shaped osseous tunnel with 4,5 mm diameter. The groups were compared in relation to maximum fixation strength (Fmax), yield load, stiffness and elongation after 1000 cycles with loading force of 50 N. Testing was performed with a material testing machine (Zwick/Roell Z010, Ulm, Deutschland). For statistical analysis IBM SPSS Version 25 was applied. Differences between the groups were calculated with Kruskal-Wallis test. Significance level was < 0,05. Results: Implantfree fixation methods in the porcine model show particulately similar fixation strength compared to the native tissue (p < 0,05). The mean Fmax of the native tissue was measured with 252,1 ± 129,3 N. The highest Fmax were observed in group 1 and group 2 (321,8 ± 53,5 N and 242,0 ± 57,4 N). The other groups showed lower Fmax (p < 0.05). Yield load was 240,8 ± 129,7 N for the native tissue. The highest yield load was observed in group 1 (285,6 ± 72,2 N). The yield load in all other groups was lower. Stiffness of the native tissue was 45,42 ± 10,8 N/mm² and comparable to group 1 (45,08 ± 13,3 N/mm²) and group 2 (47,47 ± 10,2 N/mm²). Group 5 achieved the highest stiffness (61,42 ± 10,5 N/mm²). The lowest elongation was observed in group 5 (1,36 ± 0,4 mm). Group 1 showed elongation of 3,5 ± 0,7 mm, group 2 3 ± 0,5 mm, group 3 5,28 ± 1 mm and group 4 3,7 ± 0,8 mm. Conclusion: The examined implantfree patellar fixation methods differ significantly in their biomechanical properties (p < 0,05). Adequate Fmax compared to the native tissue could be observed. Soft tissue fixation of free tendon grafts for medial patellofemoral ligament reconstruction are reasonable alternatives for patellar fixation methods.

scholarly journals Tendon Graft—Ulna Fixation in Distal Radio-Ulnar Joint Stabilisation; Biomechanical Comparison of three Graft-Bone Fixation Methods

Hand ◽  
2009 ◽  
Vol 4 (3) ◽  
pp. 279-282 ◽  
Author(s):  
N. S. Kalson ◽  
C. P. Charalambous ◽  
E. S. Powell ◽  
A. Hearnden ◽  
J. K. Stanley
Keyword(s):  
Tendon Graft ◽  
Interference Screw ◽  
Bone Tunnel ◽  
Graft Fixation ◽  
Bone Anchor ◽  
Distal Ulna ◽  
Fixation Methods ◽  
Custom Made ◽  
Significant Difference ◽  
Interference Screw Fixation

A common distal radio-ulnar joint (DRUJ) stabilisation procedure uses a tendon graft running from the lip of the radial sigmoid notch to the ulnar fovea and through a bony tunnel to the ulnar shaft, before being wrapped round the distal ulna and sutured to itself. Such graft fixation can be challenging and requires a considerable tendon length. The graft length could be reduced by fixing the graft to the ulna using a bone anchor or interference screw. The aim of this study was to compare the strength of three distal ulna graft fixation methods (tendon wrapping and suturing, bone anchor and interference screw). Four human cadaveric ulnae were used. A tendon strip was run through a tunnel in the distal ulna and secured by: (1) wrapping round the shaft and suturing it to itself, (2) a bone anchor and (3) an interference screw in the bone tunnel. Load to failure was determined using a custom-made apparatus and an Instron machine. Maximum failure load was highest for the bone anchor fixation (99.3±23.7 N) followed by the suturing (96.2±12.1 N), and the interference screw fixation (46.9±5.6 N). There was no significant difference between the tendon suturing and bone anchor methods, but the tendon suturing was statistically significantly higher compared to the interference screw ( P=0.028). In performing anatomical stabilisation of the DRUJ fixation of the tendon graft to the distal ulna with a bone anchor provides the most secure fixation. This may make the stabilisation technique less demanding and require a smaller tendon graft.

Classification and Analysis of Scleral IOL Fixation Methods

2019 ◽  
Vol 30 (5) ◽  
pp. 49-54
Author(s):  
A.A. Kozhukhov ◽  
◽  
O.V. Unguryanov ◽  
A.D. Rumiantsev ◽  
◽  
...  
Keyword(s):  
Fixation Methods ◽  
Iol Fixation

scholarly journals The Prevalence and Patterns of Palmaris Longus Muscle Absence in an Iranian Population

2019 ◽  
Vol 9 (4) ◽  
pp. 279-282
Author(s):  
Mehdi Forouzesh ◽  
Abdolrazagh Barzegar ◽  
Fardin Fallah
Keyword(s):  
Gender Difference ◽  
Clinical Importance ◽  
Tendon Graft ◽  
Iranian Population ◽  
Geographical Variability ◽  
Palmaris Longus ◽  
Longus Muscle ◽  
Palmaris Longus Muscle ◽  
And Gender ◽  
Gender Specific

Palmaris Longus (PL) is a muscle of the forearm, i.e., not functionally necessary and does not exist in all people. It is a choice for tendon graft and investigating its prevalence is of clinical importance. During April-October 2009, 102 cadavers (78 males, 24 females) were bilaterally necropsied for PL exploration in Zanjan City, Iran. PL Absence (PLA) was observed in 37 (36.3%) cases (28 males, 9 females). PLA prevalence was similar in men (36%) and women (37.5%). Of PLA cases, 19 (51%) were unilateral (14 males, 5 females), and 18 (49%) were bilateral (14 males, 4 females). In conclusion, PLA prevalence of 36.3% in our population was similar to other studies conducted in Iran. We found no gender difference in PLA prevalence and its patterns. Due to geographical variability in PLA rate, future regional and national studies with more magnificent sample sizes are recommended to determine the prevalence and gender-specific patterns of PLA.

Biomechanical Evaluation of a New Fixation Method for Stabilization of Sagittal Split Ramus Osteotomy After Mandibular Advancement

2021 ◽  
Vol 6 ◽  
pp. 247275122110192
Author(s):  
Karel Kuik ◽  
Jean Pierre T. F. Ho ◽  
Cornelis Klop ◽  
Maurits H. T. de Ruiter ◽  
Cornelis J. Kleverlaan ◽  
...  
Keyword(s):  
Hybrid Method ◽  
In Vitro Study ◽  
Mandibular Advancement ◽  
Fixation Method ◽  
Common Procedure ◽  
Sagittal Split Ramus Osteotomy ◽  
Fixation Methods ◽  
Biomechanical Evaluation ◽  
Monocortical Screws

Study Design: Biomechanical in vitro study. Mandibular advancement after sagittal split ramus osteotomy (SSRO) is a common procedure in orthognathic surgery. Several fixation methods are used for stabilization of SSRO. Objective: The aim of this study was to compare a new fixation method (gridplate) with more contemporary applied methods of fixation. Material and Methods: In this study, 50 polyurethane hemimandibles with a prefabricated SSRO were used as specimens. All hemimandibles were advanced by 8 mm and divided into 5 groups with different fixation methods: (A) one 4-hole miniplate with 4 monocortical screws; (B) two 4-hole miniplates with 8 monocortical screws; (C) one 4-hole miniplate with 4 monocortical screws and 1 bicortical screw in the retromolar area (hybrid method); (D) 3 bicortical screws in an inverted-L pattern; and (E) one 8-hole gridplate with 8 monocortical screws. Loads in newtons were recorded at displacements of the mandibular incisive edge at 1 mm, 3 mm and 5 mm. Results: Fixation with 3 bicortical screws and the gridplate presented the most stability, followed by two 4-hole miniplates. Fixation with the hybrid method or the single miniplate showed the least stability. Conclusion: According to the results of this study, the 8-hole gridplate design appears a sufficient fixation method regarding stabilization of SSRO with larger mandibular advancement.

scholarly journals Distal radioulnar joint stabilization with open foveal reinsertion versus tendon graft reconstruction: an experimental study using radiostereometry

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Janni Kjærgaard Thillemann ◽  
Sepp De Raedt ◽  
Torben Bæk Hansen ◽  
Bo Munk ◽  
Maiken Stilling
Keyword(s):  
Experimental Study ◽  
Surgical Techniques ◽  
Distal Radioulnar Joint ◽  
Tendon Graft ◽  
Imaging Method ◽  
Radioulnar Joint ◽  
Clinical Recommendation ◽  
Surgical Methods ◽  
Custom Made ◽  
Stabilizing Effect

Abstract Purpose Symptomatic instability of the distal radioulnar joint (DRUJ) caused by lesion of the Triangular Fibrocartilage Complex (TFCC) can be treated with a number of surgical techniques. Clinical examination of DRUJ translation is subjective and limited by inter-observer variability. The aim of this study was to compare the stabilizing effect on DRUJ translation with two different surgical methods using the Piano-key test and a new precise low-dose, non-invasive radiostereometric imaging method (AutoRSA). Methods In a randomized experimental study we evaluated the DRUJ translation in ten human cadaver arms (8 males, mean age 78 years) after cutting the proximal and distal TFCC insertions, and after open surgical TFCC reinsertion (n = 5) or TFCC reconstruction using a palmaris longus tendon graft ad modum Adams (n = 5). The cadaver arms were mounted in a custom-made fixture for a standardized Piano-key test. Radiostereometric images were recorded and AutoRSA software was used for image analyses. Standardised anatomical axes and coordinate systems of the forearm computer tomography bone models were applied to estimate DRUJ translation after TFCC lesions and after surgical repair. Results The DRUJ translation after cutting the proximal and distal TFCC insertions was 2.48 mm (95% CI 1.61; 3.36). Foveal TFCC reinsertion reduced DRUJ translation by 1.78 mm (95% CI 0.82; 2.74, p = 0.007), while TFCC reconstruction reduced DRUJ translation by 1.01 mm (95% CI -1.58; 3.60, p = 0.17). Conclusion In conclusion, foveal TFCC reinsertion significantly decreased DRUJ translation while the stabilizing effect of Adams TFCC reconstruction was heterogeneous. This supports the clinical recommendation of TFCC reinsertion in patients suffering from symptomatic DRUJ instability due to acute fovea TFCC lesions.

PD-L1 Immunohistochemistry on Cell Block Preparations From Different Fixatives: A Pilot Study

2019 ◽  
Vol 152 (Supplement_1) ◽  
pp. S95-S95
Author(s):  
Victoria Costa ◽  
David Kim ◽  
Abha Goyal ◽  
Bing He ◽  
Yifang Liu ◽  
...  
Keyword(s):  
Pilot Study ◽  
Personalized Medicine ◽  
Cell Block ◽  
Fixation Methods ◽  
Tonsillar Tissue ◽  
Fixed Cell ◽  
Specific Fixation ◽  
Formalin Fixed

Abstract Objectives Immunohistochemistry especially for biomarkers such as PD-L1 in personalized medicine is increasingly being performed on cell blocks from cytopathology samples. We evaluated the effects of staining cell blocks (CBs) from different cytologic fixatives using four different commercially available PD-L1 antibody clones. Methods PD-L1 immunohistochemistry (IHC) using four different commercially available clones was performed on eight cell blocks processed from two different fixatives and also on eight formalin-fixed tissues. The clones used were 22C3 at 1:50 dilution and 1:100 dilution, SP263, SP142, and E1L3N. The cell block (CB) samples contained cells that strongly express PD-L1 and either fixed in CytoLyt (methanol-based fixative, n = 4) or CytoRich (ethanol-formalin-based fixative, n = 4). Formalin-fixed control tissues (tonsillar tissue, n = 4; stomach, n = 4) were also included. Results Expression for PD-L1 was noted on all the CytoRich fixed cell blocks (n = 4) for all four antibody clones, with the intensity and distribution of expression comparable to the formalin fixed tissues (n = 8). However, consistent absence of expression for PD-L1 was noted on all the CytoLyt fixed cell blocks (n = 4) for all four antibody clones. Conclusion The results of this pilot study demonstrate that PD-L1 IHC on cell blocks is feasible. However, there is a need to validate IHC protocols according to specific fixation methods.

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