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Stability of structures

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...

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Related Experiment Video

Updated: Feb 22, 2026

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Comparing Fixation Stability of Rotationally Unstable Proximal Phalanx Fractures: A Biomechanical Study.

Francine Zeng¹, Jordan Bauer¹, Rohan Rajan¹

¹Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, USA.

Hand (New York, N.Y.)

|February 20, 2026

Summary

This summary is machine-generated.

For proximal phalanx fractures, single and dual intramedullary screws (IMS) showed similar biomechanical stability to interfragmentary screws. These fixation methods resist displacement during early motion, offering comparable stability for unstable fracture patterns.

Keywords:

biomechanics fracture fixation intramedullary proximal phalanx stability

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Published on: August 17, 2017

Area of Science:

Orthopedic surgery
Biomechanics
Hand surgery

Background:

Proximal phalanx fractures are common upper extremity injuries requiring surgical fixation for unstable patterns.
Intramedullary screw (IMS) fixation is a minimally invasive technique with potential benefits over traditional methods.
The rotational stability of IMS in unstable fracture patterns needs further investigation.

Purpose of the Study:

To compare the biomechanical stability of single IMS, dual crossing IMS, and two interfragmentary cortical screw constructs.
To evaluate resistance to rotational displacement and overall stability in short oblique proximal phalanx fractures.

Main Methods:

Eleven cadaveric hands with induced proximal phalanx fractures were used.
Fractures were treated with single IMS, dual crossing IMS, or two cortical screws.
Constructs underwent simulated postoperative flexion-extension, with angular rotation and displacement measured.

Main Results:

No significant differences in angular rotation or displacement were observed among the three fixation constructs.
None of the specimens exhibited clinically significant displacement (>2 mm) after simulated motion.

Conclusions:

Single IMS, dual IMS, and interfragmentary screws provide comparable biomechanical stability.
These constructs effectively resist displacement during simulated early postoperative range of motion for proximal phalanx fractures.