Related Experiment Video
Updated: Apr 4, 2026

Setup of Consumer Wearable Devices for Exposure and Health Monitoring in Population Studies
Published on: February 3, 2023
The SIGN Nail: Factors in a Successful Device for Low-Resource Settings
Billy Thomson Haonga1, Lewis G Zirkle
1*Muhimbili Orthopaedic Institute, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania; and †SIGN Fracture Care International, Richland, WA.
Abstract:
Surgeons in low-resource settings manage an increasing number of patients presenting with high-energy fractures. The number of surgeons and the operating time available are frequently not adequate to treat these fractures in a timely manner. A common cause of delay in treating fractures is waiting for the patient to accumulate sufficient funding to pay for the surgery, including the surgical implant. The donation of the SIGN intramedullary nail interlocking screw system obviates a major delay in timing of surgery. The SIGN intramedullary nail has been designed to be used in low-resource settings as it can be placed without fluoroscopy or electricity. The SIGN-trained surgeons are very skillful in hand reaming the canal, placing the nail, and interlocking screws without fluoroscopy. As more is learned about fracture healing, the SIGN system continues to evolve. The SIGN system is expanding to include deformity correction and soft tissue coverage.
Related Concept Videos
Factors Affecting Workability
Non-ohmic Devices
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
Short-distance Transport of Resources
Microenvironments
Factors Affecting Activity Coefficient
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
Design Consideration
The factor of safety is another key...
