A biomechanical comparison of shape memory compression staples and mechanical compression staples: compression or distraction?

Farr, David; Karim, Amer; Lutz, M.J.; Calder, James D.

doi:10.1007/s00167-009-0887-9

Cited by 13 publications

(6 citation statements)

References 12 publications

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“…While a number of other studies have evaluated the biomechanical properties of different fixation methods for the Lapidus arthrodesis ( 3 , 5 , 9 , 17 , 18 , 21 – 28 ), variations in models and testing methods make meaningful comparison difficult. When comparing the rigidity of crossed-screw constructs with locking plates in a cadaveric study, Gruber et al ( 21 ) reported peak loads in four-point bending of 110.8 and 120.4 N, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Other studies have demonstrated the compressive properties and recovery behavior of SMA staples in different models. Using a small load cell fitted between two perspex blocks, Farr et al ( 17 ) reported a peak contact force of 35 N generated by a 20 × 20 Memotech SMA staple. A similar result was recorded by Shibuya et al ( 11 ) using a pressure sensor in a sawbones calcaneus model.…”

Section: Discussionmentioning

confidence: 99%

“…Due to their superelastic and shape memory characteristics, SMA staples have the ability elastically recover from large deformations, which may occur in vivo , imparting a dynamic compressive capability not possible in conventional mechanical staples. This has been demonstrated in a number of in vitro biomechanical studies which have reported that SMA staples generate a greater compression across a simulated osteotomy compared to mechanical staples ( 11 , 17 ), and resist permanent deformation, fully recovering their shape following loading ( 18 ).…”

Section: Introductionmentioning

confidence: 87%

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Evaluation of Nitinol Staples for the Lapidus Arthrodesis in a Reproducible Biomechanical Model

et al. 2015

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While the Lapidus procedure is a widely accepted technique for treatment of hallux valgus, the optimal fixation method to maintain joint stability remains controversial. The purpose of this study is to evaluate the biomechanical properties of new shape memory alloy (SMA) staples arranged in different configurations in a repeatable first tarsometatarsal arthrodesis model. Ten sawbones models of the whole foot (n = 5 per group) were reconstructed using a single dorsal staple or two staples in a delta configuration. Each construct was mechanically tested non-destructively in dorsal four-point bending, medial four-point bending, dorsal three-point bending, and plantar cantilever bending with the staples activated at 37°C. The peak load (newton), stiffness (newton per millimeter), and plantar gapping (millimeter) were determined for each test. Pressure sensors were used to measure the contact force and area of the joint footprint in each group. There was a statistically significant increase in peak load in the two staple constructs compared to the single staple constructs for all testing modalities with P values range from 0.016 to 0.000. Stiffness also increased significantly in all tests except dorsal four-point bending. Pressure sensor readings showed a significantly higher contact force at time zero (P = 0.037) and contact area following loading in the two staple constructs (P = 0.045). Both groups completely recovered any plantar gapping following unloading and restored their initial contact footprint. The biomechanical integrity and repeatability of the models was demonstrated with no construct failures due to hardware or model breakdown. SMA staples provide fixation with the ability to dynamically apply and maintain compression across a simulated arthrodesis following a range of loading conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 87%

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Evaluation of Nitinol Staples for the Lapidus Arthrodesis in a Reproducible Biomechanical Model

et al. 2015

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“…Once placed into bone, the warmer body temperature causes the staple tines to compress to a more rigid, closed position and maintain uniform compression. 17 Given the potential advantages of staple fixation treatment in SLIL injuries and the successful application of Nitinol staple fixation for other orthopedic procedures, we aimed to investigate the use of Nitinol staple fixation in the treatment of acute SLIL injuries using a cadaver model. The purpose of this study was to compare scaphoid and lunate motion in normal wrists to motion after SLIL fixation using the traditional K-wire fixation technique and 2-tine Nitinol staple fixation.…”

mentioning

confidence: 99%

“…Once placed into bone, the warmer body temperature causes the staple tines to compress to a more rigid, closed position and maintain uniform compression. 17 …”

mentioning

confidence: 99%

Motion and Strength Analysis of 2-Tine Staple and K-Wire Fixation in Scapholunate Ligament Stabilization in a Cadaver Model

Hess

Archual

Burnett

et al. 2021

Journal of Hand Surgery Global Online

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Previous studies have demonstrated the benefits of 2-and 4-tine staple fixation in scapholunate interosseous ligament (SLIL) reconstruction, including improved rotational control and avoidance of the articular surface. This study compared scaphoid and lunate kinematics after SLIL fixation with traditional Kirschner wire (K-wire) fixation or 2-tine staple fixation. Methods: Eight fresh frozen cadaver arms with normal scapholunate (SL) intervals were included. Infrared motion capture was used to assess kinematics between the scaphoid and lunate as the wrists were moved through a simulated dart-throw motion. Kinematic data were recorded for each wrist in 4 states: SLIL intact, SLIL sectioned, K-wire fixation across SL interval and scaphocapitate joint, and 2-tine Nitinol staple fixation across SL interval. Strength of the SL staple fixation was evaluated using an axial load machine to assess load to failure of the staple construct. Results: Range of motion of the scaphoid and lunate with SLIL intact and SLIL sectioned were similar. Kwire fixation across the SL interval significantly decreased the overall wrist range of motion as well as scaphoid and lunate motion in all planes except for scaphoid flexion. Conversely, scaphoid and lunate motion after staple fixation was similar to that in normal wrists, except for a significant decrease in scaphoid extension. Under axial load simulating a ground-level fall, 3 of 8 arms demonstrated no failure, and none of the failures was due to direct failure of the 2-tine staple. Conclusions: This study demonstrates 2-tine staple fixation across the SL interval is effective in providing initial stability and maintaining physiologic motion of the scaphoid and lunate compared with K-wire fixation after SLIL injury. Clinical relevance: This study demonstrates an alternate technique for the stabilization of the SL interval in repair of acute SLIL injuries using 2-tine staple fixation, which maintains near physiologic motion of the scaphoid and lunate after SLIL injury.

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Pseudoelastic NiTiNOL in Orthopaedic Applications

Safranski

Dupont

Gall

2020

Shap. Mem. Superelasticity

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A biomechanical comparison of shape memory compression staples and mechanical compression staples: compression or distraction?

Cited by 13 publications

References 12 publications

Evaluation of Nitinol Staples for the Lapidus Arthrodesis in a Reproducible Biomechanical Model

Evaluation of Nitinol Staples for the Lapidus Arthrodesis in a Reproducible Biomechanical Model

Motion and Strength Analysis of 2-Tine Staple and K-Wire Fixation in Scapholunate Ligament Stabilization in a Cadaver Model

Pseudoelastic NiTiNOL in Orthopaedic Applications

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