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Part of Humeral Fracture Fixation
Parent Humeral Fracture Fixation

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This module applies user-centered, reproducible, and accessible design choices to maximize adoption in resource-constrained settings.

Design for Extreme Accessibility in Low Resource Settings[edit | edit source]

User-Centered Design[edit | edit source]

Medical officers are fully trained, non-specialist physicians who have not received any exposure to orthopedic surgery outside of their undergraduate medical education. Surgeons who are not orthopedic specialists have received formal advanced training in their surgical specialty but have not been trained to perform external fixation procedures for humeral fracture patients.

The placement of an external fixator is one of the 44 essential surgical procedures identified by the World Bank.[1] This module teaches modular external fixation because this procedure offers the greatest freedom in fracture management and maximum patient safety when performed by practitioners who are not orthopedic specialists in resource-constrained settings. The advantages of training non-orthopedic specialists to perform modular external fixation over uniplanar external fixation are that modular external fixationː

  • is the preferred method for the temporary stabilization of open humeral fractures
  • requires less experience and surgical skill
  • permits the practitioner to freely place pins at suitable sites to avoid nerves, vessels, and traumatized soft tissues
  • does not require intraoperative X-rays and,
  • allows for subsequent definitive fixation.[2]

Medical officers in low-resource settings may not have access to direct fluoroscopy. Modular external fixation of an open humeral fracture is a procedure that can be quickly applied without image intensification and adjusted afterwards.[2]

Practitioners in resource-constrained settings may not have access to orthopedic surgical drills for training. This module recommends a cost-saving ISO 13485 compliant orthopedic surgical drill that is designed for LMICs and permits back-to-back surgeries with a single power drill.[3]

Learners require access to high quality, standardized simulators and training. This module gives surgical practitioners in LMICs access to open-source, affordable, high fidelity, locally reproducible 3D printed bone simulation models for both basic and advanced training that are comparable to state-of-the-art, quality-tested artificial bone products that are available in high income countries.[4][5]

Learners need access to safe simulation training. All of the 3D printed bone models have a vise attachment to allow the user to secure the model inside a standard vise clamp to maximize learner safety during simulation training. Learners will be obtaining vise clamps locally and these devices can vary in size. We designed the height of the vise attachment of the Humeral Shaft Transverse Fracture Simulator to 6.0 cm in order to maximize compatibility with different sizes of locally available vise clamps.

Based on our user testing, we chose not to include the Plunge Depth Measurement for the Humeral Shaft Transverse Fracture Simulator. The rationale for these design choices is becauseː

  • the likelihood of perforating the far cortex and plunging is very low with the manual advancement of the Schanz screw into the far cortex
  • the transparent cellophane allows the learner to visually inspect and confirm that the self-drilling Schanz screws did not perforate the far cortex
  • plunge detection has not been shown to confer long-term learning benefits in reducing plunge
  • we want to avoid fostering dependence on augmented feedback ("anti-skills") since the learner will not have augmented feedback during the actual procedure, and
  • this increases simulator fidelity, reduces simulator costs, simplifies the simulator build, and minimizes simulator assembly time for the learner.[6][7]

Medical officers and surgeons who are not orthopedic specialists in LMICs have busy work schedules and typically do not have a technical background. We tailored the design of the surgical training module prototype to meet their training needs by:

  • Providing high fidelity 3D printed bone models for both basic and advanced simulation training that are designed to substantially simplify the simulator build, minimize the simulator assembly time, and accelerate the learning process for greater convenience for the learner
  • Adding detailed instructions on how to input the customized settings for the 3D printed bone models into a 3D slicing program in case the user was not familiar with using advanced 3D slicer settings, and
  • Designing the Humeral Shaft Transverse Fracture Simulator to be easy and quick to assemble and not require any tools, specialized equipment, technical expertise, or time-consuming preparation to build, install, operate and maintain these simulators within the intended place of use.

Over 4 billion people do not have access to the Internet.[8] The penetration of high-speed Internet connectivity (broadband, 3G, or better mobile connections) is less than 30% in rural regions.[9] In 2020, only 46% of the population in sub Saharan Africa owned a mobile phone and smartphones made up only 48% of total mobile connections in sub Saharan Africa.[10][11] In 2021, nearly 711 million people were in extreme poverty, which is defined as living on less than $1.90 per day.[12] To promote adoption of this surgical training module in low resource settings, we:

  • Designed the non-3D printed simulator components to be made using low cost, locally available materials and supplies
  • Developed an Appropedia module which does not require the downloading of a mobile app, creation of an account, inputting of a username and password, or paying journal or other subscription fees to access the training content
  • Provided step-by-step instructions and labelled images (instead of only videos) and published our self-assessment frameworks directly in Appropedia so the module content can be available in multiple languages and exported for offline access
  • Created self-assessment frameworks that only require taking photos and not videos which allows learners to use any cellphone with a camera and not only smartphones.

Reproducible Design[edit | edit source]

3D printing technology empowers the local, reliable, and automated manufacturing of high fidelity bone simulation models to permit high quality, standardized simulation training around the world. All of the module's bone simulation model files and print settings are open-source and available on Appropedia, can be locally reproduced on open-source, open filament desktop 3D printers using low-cost, biorenewable plastic, and are designed to be ready for use right out of the 3D printer.[13][14][15][16][17][18][19][20][21] These high fidelity 3D printed bone models are designed to substantially simplify the simulator build, minimize the simulator assembly time, and accelerate the learning process for greater convenience for the learner.

On-site access to a 3D printer is not required for the learner. Only one 3D printer is required within a country. The open-source 3D files can be downloaded by any 3D printing organization anywhere.[22] The 3D printed simulation models can be picked up by the learner or delivered anywhere across the country by motorcycles, all-terrain vehicles, trucks, or airplanes within 1-2 days.[23]

This module does not require access to teachers, animal bones, artificial bones or human cadaveric bones, and uses locally available hardware and materials, and locally made, high fidelity bone simulation models for modular external fixation procedure skills training.

When possible, the surgical hardware and equipment are reusable to minimize the use of consumables and maximize their lifespan in the place of use.

The primary risk to reproducibility of this surgical training module is access to affordable orthopedic surgical hardware for training. We have developed local and international partnerships to deliver modular external fixation kits, and surgical drills with autoclavable covers on demand and at minimal cost for up to 82,055 medical officers and surgeons across Nigeria who are not orthopedic specialists.[3][23][24][25][26]

The total cost of Humeral Shaft Transverse Fracture Simulator consumables per learner is $23.77 USD. The total cost of purchasing the reusable supplies in Nigeria for the Humeral Shaft Transverse Fracture Simulator for Modular External Fixation for an Open Humeral Shaft Transverse Fracture Training is $36.40 USD. This Humeral Shaft Transverse Fracture Simulator cost calculation does not cover shipping, delivery or orthopedic surgical hardware, supplies, and equipment costs.

2022 Learner Costs for Supplies Locally Purchased in Nigeria for the Humeral Shaft Transverse Fracture Simulator for Modular External Fixation for an Open Humeral Shaft Transverse Fracture Training
Item Quantity Purchase Cost in USD Consumable or Resuable
3D Printed Adult Male Humeral Bone Model #1 (manufactured locally by a 3D printing company in Nigeria[22]) 1 $11.65 (includes filament and production costs)[27] Consumable
3D Printed Adult Male Humeral Bone Model #2 (manufactured locally by a 3D printing company in Nigeria[22]) 1 $11.32 (includes filament and production costs)[27] Consumable
2-in-1 Table Vise Clamp[28] 2 $34.00 Reusable
Cellophane One 40.0 cm by 100.0 cm strip $0.80 Consumable
Protractor 1 $2.40 Reusable
Cellphone Camera 1 Readily available in place of use Reusable

No tools, specialized equipment, technical expertise, or time-consuming preparation is required to build, install, operate and maintain the Humeral Shaft Transverse Fracture Simulator within the intended place of use.

Our high fidelity simulators offer significant value for money in comparison to existing approaches such as artificial bones and human cadaveric bones.

The costs of the 3D Printed Adult Humeral Bone Models will vary depending on the region's 3D printing organizations, and locally available brands of filament.

In Canada, a 1.0 kg roll of white PLA costs $17.95 CAD which is equal to about 1.4¢ USD per gram.[29][30] The Humeral Shaft Transverse Fracture Simulator (3D Printed Adult Male Humeral Bone Models #1 and #2) weighs 281 grams and the total filament cost in Canada is $3.93 USD.

In Nigeria, one 750 gram roll of Ultimaker White PLA filament (Shore Hardness 83D) costs €33 Euros which is equal to about 5¢ USD per gram.[31][32] In 2022, the 3D Printed Adult Male Humeral Bone Models #1 and #2 produced by a local 3D printing business in Nigeria at 100% scale is $11.65 and $11.32 USD (not including local taxes or shipping costs).[27]

The benefits of 3D printing the Humeral Shaft Transverse Fracture Simulator (3D Printed Adult Humeral Bone Models #1 and #2) locally in Nigeria are that the purchase cost is over 10 times cheaper and the production time is over 163 times faster than purchasing a comparable artificial bone product that is imported from abroad, and the purchase cost is over 3 times cheaper than acquiring a human cadaveric humerus prepared by a local university anatomy lab.[4][27][33] By purchasing locally made 3D printed bone models for modular external fixation skills training, the learner also supports the local economy while saving on customs dues, processing fees, and international shipping costs that would be incurred when using artificial bone products that are not made locally.

Accessible Design[edit | edit source]

This Appropedia-based module is available in the 6 official languages of the United Nations, Kiswahili, the lingua franca of the East African Community, and other languages to help ensure that surgical practitioners from anywhere in the world will be able to engage with the content without barriers or gatekeeping.

Each 3D printed bone simulation model displays the model number translated in the 6 official languages of the United Nations, and the model gender using internationally recognized ISO 7001 graphical symbols for males and females to assist with model identification.

We provided step-by-step instructions and labelled images (instead of only videos) so the module content can be available in multiple languages and exported for offline access.

We published our self-assessment frameworks directly in the Appropedia module (instead of a downloadable pdf) to provide automatic translations of the Training Logbooks in multiple languages to learners around the world.

We created self-assessment frameworks that only require taking photos and not videos which allows learners to use any cellphone with a camera and not only smartphones.

This module does not require the downloading of a mobile app, creation of an account, inputting of a username and password, or paying journal or other subscription fees to access the training content.

Offline and Off Grid Access[edit | edit source]

Self-directed training is typically only available online or via mobile apps. These traditional approaches have accessibility barriers in low resource settings because:

  • Over 4 billion people do not have access to the Internet
  • The penetration of high-speed Internet connectivity (broadband, 3G, or better mobile connections) is less than 30% in rural regions
  • Only 46% of the population in sub Saharan Africa owns a mobile phone
  • Smartphones make up only 48% of total mobile connections in sub Saharan Africa, and
  • An estimated 770 million people worldwide lack access to electricity and 600 million of these individuals reside in sub Saharan Africa.[8][9][10][11][34]

The demand for this module will be greatest in regions with little or no access to the Internet, smartphones, or grid electricity. Our self-assessment frameworks only require taking photos and not videos. This allows learners to use any cellphone with a camera and not only smartphones. When possible, we have provided images (instead of only videos) so the module content can be available in pdf format using Appropedia's export function for offline access.

Over 235 million people require humanitarian assistance and 44.7 million people in conflict zones lack access to basic medical care.[35][36] Every day, hospitals, patients, healthcare staff, ambulances, and aid workers come under attack in regions affected by conflict and other emergencies.[37][38] Online platforms and mobile phones are vulnerable to security breaches which can be used to target bombing attacks on hospitals in conflict zones.[39] It is critical that this training module be available offline to remain isolated from any surveillance from an external Internet connection to prevent hackers from targeting healthcare workers and facilities in conflict zones.

Paper-based versions of surgical training modules are sub-optimal because they cannot provide video and multimedia content which is essential for self-assessed surgical skills training. We can use Linux open-source software and an offline (air gapped), energy-efficient, ultraportable Raspberry Pi with integrated 7-inch touchscreen display to make this module safely available to the surgical practitioners serving the 4 billion people who do not have access to the Internet and the millions of the most vulnerable civilians in conflict zones.[40][41]

A 2015 study shows that a Raspberry Pi ($35 USD) with a 10 inch display consumes almost the same amount of energy (21.24 kJ/h) as a smartphone ($400 USD) with 4.7 inch display (18 kJ/h), 4.2 times less energy than a $320 USD tablet (90 kJ/h), and 8.5 times less energy than a $728 USD laptop (180 kJ/h).[42] The advantages of using a Raspberry Pi with an integrated 7-inch display screen over a smartphone or tablet are reduced costs, energy efficiency and a larger screen area to optimize learning.

To minimize the use of offline storage capacity and maximize the number of validated, open-source GSTC Appropedia modules that can be stored and made available offline on a Raspberry Pi, we designed this module to minimize the number of secondary or tertiary links, when possible. Our team will be recruiting volunteer Medical Makers to help make GSTC Appropedia modules available offline to maximize the global impact of the GSTC.

Last Mile Implementation[edit | edit source]

We will be partnering with local Makerspaces in LMICs to serve as training, manufacturing, and distribution centers that educate local Makers to make high fidelity, 3D printed bone models and offline simulation training modules at the lowest cost for practitioners in LMICs.[43][44][45][46]

Over half of Nigeria's population of 206 million people live in rural areas but only 15% of the road networks are paved.[47] We are continuing to develop local and international partnerships to deliver locally made 3D printed bone models, modular external fixation kits for simulation training and clinical use, surgical drills with autoclavable covers, and offline training modules on demand and at minimal cost for up to 82,055 medical officers and surgeons across Nigeria who are not orthopedic specialists.[3][22][23][24][25][26]

Sustainable Design for Scale-Up[edit | edit source]

We designed our entire module to be available on Appropedia because this platform does not require any subscription fees to maintain our online module and does not require mobile app software development updates to maintain compatibility with future versions of iOS and Android operating systems.

In partnership with FabCare, our team co-led a Fab Fest workshop on October 17, 2022 (World Trauma Day) to empower 2,000 Fab Labs in 149 countries to: (i) generate revenue by locally reproducing all GSTC simulators, and (ii) set up reusable simulator equipment lending libraries to advance sustainable surgical education and care in austere settings. Our discussion with workshop attendees from Columbia, Germany, and Japan with backgrounds in military engineering, sustainability, design, and firefighting generated the following ideas:

  • Import 3D printer filament and 3D printed bone models from China to help meet market volume needs;
  • Bone models can be tailored to the average tibial length and cortical thickness of the learner's local patient population by rescaling the models and changing the wall thickness settings in the Ultimaker Cura slicer program to published bone morphometry values for the target population; and
  • Return the used bone models to makerspaces with filament recycling capabilities so the bone models can be converted into printer filament and upcycled into useful objects.

On October 6, 2022, our team gave a presentation about our module to potential donors, civil servants, and educators at the October 6, 2022 Ontario Science Center RBC Innovators Ball and hosted a demonstration booth showcasing our 3D printed surgical simulators afterwards.

On March 5, 2022, our Team Co-Lead gave a keynote presentation for the Women in Leadership Summit 2022 for the Alberta Teachers' Association. We explained how our team has designed open-source, locally reproducible, data-driven, gender-specific, eco-friendly, hygienic, and cruelty-free 3D printed bone models to train healthcare practitioners to develop essential orthopedic surgical skills to prevent needless suffering, disability and deaths for the estimated 133 million people who sustain extremity and pelvic fractures globally every year.

We have submitted an application for a new Guinness World Records title for "Most users to take an online surgical simulation lesson in 24 hours." If accepted by Guinness World Records, this title can be used for all the GSTC modules and can foster collaboration with all GSTC teams moving forward. If our title proposal is not accepted, we can still collaborate with all GSTC teams to set a Guinness World Record for the existing title of "Most users to take an online health awareness lesson in 24 hours."

We plan to host the first annually recurring Guinness World Record-setting event at the National Hospital of Abuja with a hybrid in-person/online global event on Global Surgery Day on May 25, 2023 or another suitable date. A Guinness World Record-setting event will engage learners globally by leveraging the social phenomenon of "fear of missing out" (FOMO). A hybrid in-person/online event will permit learners to participate remotely if they cannot travel to an in-person event.

For greater convenience for learners, our team has offered to host our current and future open-access GSTC modules for residents, and attending physicians in high income countries who wish to learn lifesaving surgical skills. A portion of the proceeds from the workshop fees would be used to help subsidize the costs of the training consumables and hardware for clinical use for learners in resource-constrained settings. During the workshop, learners in high income countries can virtually meet the learners in low to middle income countries who will be benefiting from the workshop fees. We can show the world how physicians in the Global North and South can work together to achieve sustainable and scalable access to GSTC modules in resource-constrained settings.

We have prepared a Charity Sponsor agreement with the Royal College of Surgeons in Ireland (RCSI), with the support of our RCSI mentor, Mr. Eric O'Flynn. Our Charity Sponsor Agreement is intended to receive, administer, and distribute our Global Surgical Training Challenge Team project's funds and non-cash gifts from donors in Canada, U.S. and Ireland and issue tax-deductible receipts to these donors to the extent permitted by law.

To grow community engagement, we are identifying GSTC ambassadors and creating GSTC-themed swag similar to the Stop the Bleed Project. On October 5, 2022, we proposed sharing friendship pins with GSTC Team members, learners and conference attendees who stop by the booth exhibiting the GSTC modules. These lapel pins reflect the diverse GSTC modules and can be worn on a physician's white lab coat or suit jacket.

I Heart Guts also has vagina-themed and trachea-themed pins for our planned future modules on Obstetric Fistula Repair and Surgical Cricothyrotomy. I Heart Guts created a special edition Megacolon plush toy for the Mutter Museum.[48] We can spearhead the development of innovative, special edition plush toys, pins, and other merchandise in partnership with a charitable organization to qualify for wholesale pricing, and have the proceeds support our learners in resource-constrained settings.

We can partner with Appropedia and Intersurgeon to also set up a Craigslist-style "needs request" platform to match individual learners who face challenges accessing materials and equipment for our modules with potential donors, stakeholders, and collaborators. We can spearhead the user-centered design of a barrier-free online platform to empower private-public partnerships that are vital for the global scale-up of GSTC modules.

Acknowledgements[edit | edit source]

This work is funded by a grant from the Intuitive Foundation. Any research, findings, conclusions, or recommendations expressed in this work are those of the author(s), and not of the Intuitive Foundation.

References[edit | edit source]

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