Interlocking Pin
Interlocking Pin - Related Videos
01:21
Euler's Formula for Pin-Ended Columns
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2024
In structural engineering, the stability of columns under compressive axial loads is a critical consideration, described as buckling. A typical example involves a column PQ, which is pin-connected at both ends and subjected to a centric axial load F applied at one end, with a reaction force of F' = -F at the other end. Here, it is crucial to understand that when an applied load exceeds the critical load, buckling occurs as the system becomes unstable. To calculate the critical load, envision...
03:57
Transverse Fracture of the Mouse Femur with Stabilizing Pin
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Cited by 3 •
2021
This protocol describes a method to perform fractures on adult mice and monitor the healing process.
10:39
Reconfigurable Microfluidic Channel with Pin-discretized Sidewalls
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2018
A microfluidic channel with deformable sidewalls offers flow control, particle handling, channel dimension customization and other reconfigurations while in use. We describe a method for fabricating a microfluidic channel with sidewalls made of an array of pins that allows their shape to change.
07:41
An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice
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Cited by 10 •
2016
This protocol describes an osteosynthesis technique using an intramedullary locking nail for standardized fixation of femur osteotomies, which can be used to analyze normal and defective bone healing in mice.
10:09
Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
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Cited by 19 •
2014
One constraint of preclinical research in the field of bone repair is the lack of experimental control over the local mechanical environment within a healing bone lesion. We report the design and use of an external fixator for bone repair with the ability to change fixator stiffness in vivo.
FAQs
The pin creates a transverse connection between the bone and the intramedullary nail. That connection limits rotational movement, shortening, and displacement that could compromise maintained fracture alignment. By controlling these three modes of instability simultaneously, interlocking fixation helps preserve the structural relationship of the injured long bone while healing progresses.
The pin adds transverse restraint to the intramedullary nail construct. Nail placement within the medullary canal establishes the implant’s internal position, while the pin links the implant to the surrounding bone and limits rotation, shortening, and displacement. This combined arrangement gives the fixation a defined role in maintaining alignment and sharing mechanical loads during healing.
Unstable or comminuted fractures are more likely to require control of alignment under changing mechanical conditions. Adding transverse fixation addresses rotation, shortening, and displacement at the nail-bone interface. For femoral and tibial injuries, this can provide the structural control needed to support healing and permit rehabilitation while preserving the limb’s configuration.
Correct positioning helps preserve both limb length and alignment as the fracture heals. Because the pin restrains shortening and displacement, its placement directly affects whether the bone remains in the intended relationship to the implant. This is particularly important during rehabilitation, when the stabilized limb must maintain its structural configuration while mechanical loads are shared.
First, the intramedullary nail is placed within the medullary canal. The interlocking pin is then passed transversely through both the bone and the nail. This sequence allows the pin to connect the already positioned implant with the surrounding bone, establishing restraint against rotation, shortening, and displacement that supports fracture stabilization.
Its use is relevant when a long-bone fracture is unstable or comminuted and requires structural control during healing. The approach is described for injuries involving the femur and tibia, where limiting rotation, shortening, and displacement can support fracture management and provide stability as the patient progresses through rehabilitation.
The fixation can help maintain limb length and alignment during healing while supporting structural stability through rehabilitation. Its value is therefore assessed not only by initial fracture stabilization, but also by whether the injured long bone remains appropriately positioned as recovery proceeds. These outcomes are central to trauma surgery and broader fracture management.