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Frictional Forces on Screws

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Related Experiment Video

Updated: Apr 30, 2026

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Published on: June 6, 2025

Blade versus Screw Complication Risk for Intertrochanteric Fracture Fixation.

Arielle Richey Levine¹, James L Cross, Trevan Klug

¹Department of Orthopaedics & Rehabilitation, Yale School of Medicine, New Haven, CT, USA.

Journal of Orthopaedic Trauma

|April 28, 2026

Summary

This summary is machine-generated.

The choice between a blade or screw for cephalomedullary nails in intertrochanteric fractures did not significantly impact bony complications or reoperation rates. Proper fracture reduction, however, was strongly linked to better outcomes.

Keywords:

Complication Geriatric Hip Fracture Hip Fracture Service Intertrochanteric Hip Fracture Reoperation

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Published on: January 6, 2023

Area of Science:

Orthopedic Surgery
Trauma Surgery
Biomedical Engineering

Background:

Intertrochanteric femur fractures are common, particularly in elderly patients.
Cephalomedullary nails (CMN) are a standard treatment for these fractures.
Fixation of the proximal femur within the CMN can be achieved using either a blade or a screw, with potential implications for stability and complications.

Purpose of the Study:

To compare the incidence of bony complications and reoperation rates between blade and screw fixation in CMN for intertrochanteric fractures.
To identify factors influencing outcomes in these patients.

Main Methods:

Retrospective cohort study involving 1,078 patients with intertrochanteric fractures (OTA/AO 31A) treated with CMN.
Patients were divided into groups based on blade or screw fixation.
Propensity matching and stratification by fracture stability were employed for comparative analysis.

Main Results:

No statistically significant difference in overall complications (5.7% blade vs. 5.4% screw) or reoperations (5.2% blade vs. 3.7% screw) was observed between the blade and screw groups.
This finding remained consistent when stratifying patients by fracture instability.
Logistic regression identified adequate fracture reduction parameters and patient characteristics (BMI, ASA status, smoking, fracture stability) as significant predictors of complications and reoperation, not the implant type.

Conclusions:

The choice between a blade or screw for proximal femur fixation in CMN for intertrochanteric fractures is not associated with significant differences in bony complications or reoperation rates.
Malreduction emerged as a critical factor correlating with adverse outcomes, underscoring the importance of achieving adequate reduction during surgery.