scholarly journals Proximal Adductor Avulsion: A Biomechanical Comparison of Suture Anchor Repair Techniques

2019 ◽  
Vol 7 (7_suppl5) ◽  
pp. 2325967119S0042
Author(s):  
Elan J. Golan ◽  
Nicholas Yohe ◽  
Ernest M. J. Schilders ◽  
Srino Bharam
Keyword(s):  
Suture Anchor ◽  
Musculotendinous Junction ◽  
Anchor Group ◽  
Pull Out ◽  
Acute Injuries ◽  
Load To Failure ◽  
Collection Data ◽  
Fresh Frozen ◽  
Biomechanical Comparison ◽  
Repair Techniques

Objectives: Acute avulsion of the proximal fibrocartilaginous origin of the adductor longus (AL) is an injury mostly occurring in individuals that perform cutting and rapid lateral movements such as in hockey, soccer, and rugby. Especially in competitive athletes, recent trends have advocated for surgical repair of these acute injuries. However, while multiple repair configurations have been proposed, the current literature lacks biomechanical data to guide surgical technique. Therefore, the purpose of this study was to determine load-to-failure values for two proximal adductor repair techniques and to compare their strength to that of a native, uninjured proximal adductor tendon. Methods: Seventeen cadaveric fresh frozen pelvic specimens were dissected to preserve the proximal adductor tendon and the fibrocartilage attachment to the pubis. The specimens were then divided into three groups: an intact AL tendon(baseline control), and ‘torn’ tendons repaired with either a 2-suture anchor or 4-suture anchor technique. Once repaired, specimens were cyclically loaded on a custom jig to simulate a maximal effort soccer-style kick. Testing endpoints included suture anchor pull-out, loss of clamp fixation, or catastrophic tendon failure. To control for individual differences, values were reported both in terms of gross force and as load-to-displacement ratios. Following collection, data from each of the three groups were recorded and analyzed via Kruskal-Wallis and multiple comparison tests. Results: The mean load to failure for the 4-anchor group was 83.74±19.28 N, which was significantly greater than for either the intact (25.43±3.46 N, p <0.05) or 2-anchor repair (20.58±1.33 N, p <0.001) conditions. All intact and 4-anchor repair specimens failed via disruption distal to the adductor’s musculotendinous junction, with no failure at the bone-anchor interface noted in either of these groups. In contrast, 80% of 2-anchor repairs failed at the bone to anchor interface. In this group, following initial pullout, failure of a secondary anchor occurred with 41.4% less force than for the index failure (p < 0.001). Conclusion: This study provides biomechanical data which identifies a 4-anchor repair as being much more resistant to surgical-site failure than a 2-anchor construct. Further, the 4-anchor group failed at the same anatomic location as the intact adductor group, suggesting that a 4-anchor construct results in a repair that acts similar to an uninjured control. Based on this finding, a 4-anchor repair construct should be preferentially used in proximal adductor repair whenever clinically feasible. [Figure: see text][Figure: see text]

scholarly journals Biomechanical Comparison of a Prepared Thick Fresh Frozen Irradiated Fascia Lata Allograft to the Native Superior Capsule (212)

2021 ◽  
Vol 9 (10_suppl5) ◽  
pp. 2325967121S0032
Author(s):  
Nicholas Debellis ◽  
John Manning ◽  
James Tibone ◽  
Michelle McGarry ◽  
Gregory Adamson ◽  
...  
Keyword(s):  
Ultimate Load ◽  
Fascia Lata ◽  
Cadaveric Specimen ◽  
Yield Load ◽  
Total Displacement ◽  
Pull Out ◽  
Significant Difference ◽  
Load To Failure ◽  
Fresh Frozen ◽  
Biomechanical Comparison

Objectives: Superior Capsule Reconstruction (SCR) has been described as treatment option for irreparable tears of the superior rotator cuff. Reported outcomes on the success of the surgery have been variable, with graft choice seeming to be one of the most important factors. Fascia Lata (FL) allograft has been proposed as a potential option as it provides adequate graft thickness while avoiding the morbidity of an autograft harvest. The purpose of this study was to compare the biomechanical characteristics of an SCR with FL allograft (FL-SCR) to a native superior capsule in a cadaveric specimen. Methods: Eight cadaver shoulder specimens were used. Each specimen was tested with a custom shoulder system twice. Initial testing was performed after the specimen was dissected of all soft tissue except for the native superior capsule. Subsequent testing was performed after FL-SCR was done. All allografts were fresh frozen and irradiated. Capsule and graft dimensions were recorded before testing. Biomechanical values recorded were cyclic and load to failure for both the native capsule and FL-SCR, and fixation displacement for the SCR-FL construct. A Paired T-test was performed to compare the biomechanical values of the native superior capsule to the FL-SCR. Results: The mean thickness of the NSC was 2.4 ± 0.6 mm and 7.4 ± 1.2mm for the FL graft. The native superior capsule had an average linear stiffness of 94.5 ± 20.4 N/mm, yield load of 386.9 ± 63.6 N, ultimate load of 444.9 ± 67.7 N and energy absorbed of 1418.4 ± 248.8 N-mm. The FL-SCR construct had an average linear stiffness of 28.0 ± 1.6 N/mm, yield load of 123.8 ± 54.3 N, ultimate load of 369.0 ± 43.4 N and energy absorbed of 5021.2 ± 755.1 N-mm. Comparing the two groups there was a statistically significant difference for stiffness (P = 0.013), yield load (P = 0.03) and energy absorbed (P = 0.003). There was no statistically significant difference between ultimate load. The total displacement of the FL-SCR fixation was 5.8 ± 0.6 mm after 1 cycle, 8.5 ± 0.7 mm after 30 cycles, 11.4 ± 1.8 mm at the yield load and 29.5 ± 1.8 mm at the ultimate load. For the failure mode, 8/8 NSC specimens failed at the mid-substance. The FL-SCR, 3/8 specimens failed at the suture tendon interface and 4/8 had medial anchor pull out. Conclusions: Performing SCR with FL allograft in a cadaver model creates a construct that is sufficiently strong enough to withstand normal physiologic loading of the shoulder, although it does not fully re-create the biomechanical characteristics of a native shoulder superior capsule.

The Addition of a Krackow Rip Stop Suture Augment After Achilles Tendon Debridement for Insertional Achilles Tendinopathy: A Biomechanical Study

2021 ◽  
pp. 193864002110336
Author(s):  
LT Thomas J. Kelsey ◽  
LT Kyle W. Mombell ◽  
CDR Todd A. Fellars
Keyword(s):  
Achilles Tendon ◽  
Suture Anchor ◽  
Maximum Load ◽  
Achilles Tendinopathy ◽  
Catastrophic Failure ◽  
Double Row ◽  
Average Load ◽  
Load To Failure ◽  
Insertional Achilles Tendinopathy ◽  
Repair Techniques

Background In the operative treatment of insertional Achilles tendinopathy, the Achilles tendon is often released from its insertion to allow for adequate debridement of pathologic tissue. The use of a double row suture anchor construct has become increasingly favorable among surgeons after Achilles tendon debridement. This study hypothesized that the addition of a Krackow rip stop suture augment to the double row suture anchor construct would increase the repair’s maximum load to failure. A biomechanically stronger repair would potentially decrease the risk of catastrophic failure with early weight-bearing or accidental forced dorsiflexion after operative management for insertional Achilles tendinopathy. Methods Fourteen cadaveric specimens were used to compare the 2 repair techniques. Achilles tendons were debrided and repaired using either a double row suture anchor with and without the additional Krackow rip stop suture augment. The 2 repair techniques were compared using an axial-torsion testing system to measure average load to failure. Results The average load to failure for the double row suture anchor repair alone was 152.00 N. The average load to failure for the tendons with the double row suture anchor with the Krackow rip stop augment was 383.08 N. An independent-samples Mann-Whitney U-test was conducted and the suture anchor plus Krackow augment group had a significantly higher load to failure ( P = .011, Mann-Whitney U = 5.00, n1 = n2 = 7, P < .05, 2-tailed). Conclusion This study confirmed that the addition of a Krakow rip stop augment to the double row suture anchor is able to increase the maximum load to failure when compared to the double row suture anchor alone. These results suggest the potential of this added technique to decrease the risk of catastrophic failure.

Rotator Cuff Repair: An Ex Vivo Analysis of Suture Anchor Repair Techniques on Initial Load to Failure

2005 ◽  
Vol 21 (10) ◽  
pp. 1236-1241 ◽  
Author(s):  
Craig A. Cummins ◽  
Richard C. Appleyard ◽  
Sabrina Strickland ◽  
Pieter-Stijn Haen ◽  
Shiyi Chen ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Rotator Cuff Repair ◽  
Suture Anchor ◽  
Ex Vivo ◽  
Initial Load ◽  
Load To Failure ◽  
Cuff Repair ◽  
Suture Anchor Repair ◽  
Repair Techniques

scholarly journals A BIOMECHANICAL COMPARISON OF SUTURE ANCHOR VS. INTERFERENCE SCREW TECHNIQUE FOR PATELLAR FIXATION FOR MEDIAL PATELLOFEMORAL LIGAMENT RECONSTRUCTION

2019 ◽  
Vol 7 (3_suppl) ◽  
pp. 2325967119S0010
Author(s):  
Dragomi Mijic ◽  
Sanar Yokhana ◽  
Kunal Kalra
Keyword(s):  
Repeated Measures ◽  
Medial Patellofemoral Ligament ◽  
Suture Anchor ◽  
Interference Screw ◽  
T Test ◽  
Mpfl Reconstruction ◽  
Initial Stiffness ◽  
Significant Difference ◽  
Load To Failure ◽  
Fresh Frozen

Background: There are numerous techniques for MPFL reconstruction, however, one single technique has not been proven to be superior to another. Suture anchor reconstruction has been shown to provide stable fixation while decreasing the risk of patellar fracture. The aim of the study was to compare the stiffness and clinical load to failure of two common MPFL reconstruction techniques. Our hypothesis was that there would be no significant difference in the stiffness and the clinical load to failure between the suture anchor and interference screw reconstructions. Methods: Eight pairs of fresh frozen cadaveric knees were randomized into two groups undergoing MPFL reconstruction using either a suture anchor technique (n=8) or an interference screw technique (n=8). Testing was performed at 0, 30, 60, and 90 degrees of flexion for the native knee, transected medial structures, and reconstructed MPFL. Next, the reconstructed MPFL specimens were tested until failure in 0 degrees of flexion. T test, One-Way ANOVA, and repeated measures of ANOVA were used for statistical analysis, P values less than 0.05 were considered significant. Results: The average stiffness for the suture anchor and interference screw reconstructions was 12.02 ± 3.96 N/mm and 14.21 ± 4.20 N/mm, respectively (t test, p = 0.27), while average clinical load to failure was 256.57 ± 54.1 N and 237.81 ± 23.82 N, respectively (t test, p = 0.38). There was no significant difference in stiffness between the suture anchor and interference screw techniques at 0, 30, and 60 degrees of flexion. Conclusions: The suture anchor and interference screw reconstruction techniques produce comparable stiffness for sub-failure testing at 0 and 30 degrees of flexion. For testing to failure, the initial stiffness for both reconstruction techniques have been shown to be concordant with previously published values for the native MPFL. Both reconstruction techniques provide greater ultimate failure loads than those reported for the native MPFL in previous studies. Clinical Relevance: Suture anchor reconstruction described in our study provides another reliable option for the reconstruction of the medial patellofemoral ligament. [Figure: see text]

scholarly journals Biomechanical Comparison of Flexor Digitorum Profundus Avulsion Repair

2019 ◽  
Vol 08 (04) ◽  
pp. 312-316 ◽  
Author(s):  
Jill G. Putnam ◽  
Damon Adamany
Keyword(s):  
Suture Anchor ◽  
Tendon Repair ◽  
Maximum Load ◽  
Flexor Digitorum Profundus ◽  
Anchor Group ◽  
Load To Failure ◽  
Group 3 ◽  
Group 2 ◽  
Flexor Digitorum ◽  
Group 1

Purpose Multiple repair techniques have been investigated for flexor digitorum profundus (FDP) tendon avulsions. The purpose of this study is to compare the biomechanical characteristics of a new fully threaded titanium suture anchor with previously examined fixation techniques. Methods Repair of FDP tendon avulsions was performed in 18 fresh-frozen cadavers using one of three implants: Nano Corkscrew FT 1.7 mm suture anchor (Group 1; Arthrex, Inc., Naples, FL; n = 6), Mitek Micro 1.3 mm suture anchor (Group 2; Mitek Surgical Products, Westwood, MA; n = 6), or pullout suture button fixation (Group 3; n = 6). Constructs were preloaded before testing load to failure. For each trial, elongation at 20 N and maximum load, mean load to failure, stiffness, and failure mechanism were recorded. Results Load to failure occurred in all trials. Mean load to failure was significantly greater for Group 1 (61.6 ± 18.9 N) compared to Group 2 (42.5 ± 4.2 N; p < 0.05) and Group 3 (41.6 N ± 8.0 N; p < 0.05). Stiffness was significantly greater in Groups 1 and 2 compared to Group 3 (6.9 ± 2.2 N/mm vs. 6.1 ± 0.8 N/mm vs. 3.1 N/mm ± 0.5 N/mm, respectively, p < 0.01). Mechanism of failure differed between the groups: Group 1 broke at the anchor in two trials and tore through the tendon in three trials, Group 2's suture universally broke at the anchor, and Group 3's trials mainly failed at the button. Conclusions The Nano Corkscrew anchor (Group 1) has a significantly higher load to failure when compared with the other techniques. The higher load to failure of the corkscrew anchor provides a secure method for flexor tendon repair in zone I. Clinical Relevance A fully threaded titanium suture anchor used for FDP tendon avulsion injuries is likely to withstand early active range of motion protocols.

Biomechanical Comparison of Patellar Tendon Repairs in a Cadaver Model: An Evaluation of Gap Formation at the Repair Site with Cyclic Loading

2002 ◽  
Vol 30 (4) ◽  
pp. 469-473 ◽  
Author(s):  
Richard V. Ravalin ◽  
Augustus D. Mazzocca ◽  
John C. Grady-Benson ◽  
Carl W. Nissen ◽  
Doug J. Adams
Keyword(s):  
Patellar Tendon ◽  
Tendon Repair ◽  
Early Mobilization ◽  
Suture Repair ◽  
Gap Formation ◽  
Repair Site ◽  
Fresh Frozen ◽  
Biomechanical Comparison ◽  
Drill Holes ◽  
Repair Techniques

Background Ruptures of the patellar tendon are rare injuries. Surgical treatment for this injury is mandatory. Hypothesis Gap formation does not differ between the three patellar tendon repair techniques. Study Design Controlled laboratory study. Methods Twelve fresh-frozen cadaveric knees were used to compare three techniques of patellar tendon repairs. The standard suture repair used two Krackow sutures placed in the avulsed patellar tendon, passed through transpatellar drill holes, and secured with the knee in 30° of flexion. In the second group, suture repair was augmented with a No. 5 Ethibond suture. In the third group, suture repair was augmented with a 2.0 Dall-Miles cable. Testing was performed with the specimens mounted to a custom knee jig with the tibia free, simulating the knee moment of a 70-kg person. Each knee was then cycled 250 times at 0.25 Hz. Results Gap formation across the standard suture repair averaged 7.3 mm; across the suture augmentation and cable augmentation groups it averaged 4.9 mm and 3.5 mm, respectively. Conclusions Augmentation of patellar tendon avulsions can decrease gap formation at the repair site, allowing early mobilization. Clinical Relevance Gap formation seen in repair without augmentation could lead to clinical failure with resultant patella alta and extensor mechanism lag.

scholarly journals Biomechanical Comparison of Different Volar Screw Placements for Horizontal Oblique Scaphoid Fractures

2020 ◽  
Vol 10 (23) ◽  
pp. 8592
Author(s):  
Ting-Sheng Lin ◽  
Ching-Hou Ma ◽  
Chin-Hsien Wu ◽  
Cheng-Yo Yen ◽  
I-Ming Jou ◽  
...  
Keyword(s):  
Clinical Investigation ◽  
Biomechanical Model ◽  
Screw Placement ◽  
Fixation Strength ◽  
Volar Approach ◽  
Scaphoid Fractures ◽  
Group I ◽  
Load To Failure ◽  
Fresh Frozen ◽  
Biomechanical Comparison

Recently, some surgeons reported that most scaphoid waist fractures were horizontal oblique and not transverse in orientation. Therefore, this cadaveric study aimed to biomechanically compare fixation strength between central and eccentric screw placements for the volar fixation of this most common scaphoid waist fracture. Eight matched pairs of fresh-frozen forearm cadaver specimens were prepared for testing and randomly assigned to two groups: group I specimens were fixed by screws in a central placement, and group II specimens were fixed by screws in an eccentric placement. Horizontal oblique osteotomy was performed along the scaphoid waist. Then, each specimen was placed under the increasing load of a pneumatically driven plunger. We recorded stiffness, load to failure, and failure mechanisms between the central and eccentric screw placement groups. Stiffness was higher in central screw placement (74.1 N/mm) than in eccentric screw placement (29.39 N/mm). The median loads to failure in groups I and II were 54.14 and 26.22 N, respectively. In this biomechanical model, we demonstrated that central screw placement is superior to eccentric placement in terms of fixation strength. However, further clinical investigation is warranted to evaluate whether the different screw placements for volar approach of horizontal oblique scaphoid fractures affect the clinical outcomes.

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