Injury Mystery Lab

Visual model v2: The photographic-style student, skin, equipment, bruise textures, and wound textures are AI-generated illustrations. X-rays are deliberately drawn and textured in code using the classroom reference and OpenStax foot anatomy; they are not patient scans. The foot is held visually consistent across trials. Four bruising levels (none, faint, moderate, extensive), three laceration states (none, small, larger), and five bone states (none, small partial, larger partial, complete aligned, complete displaced) are independently rendered. These permit 60 surface/bone combinations in the renderer, but the drop rules choose only a subset. Swelling, one-versus-two affected metatarsals, and documented healing appearances are additional dimensions. Bruising represents an illustrative examination appearance after an impact; the animation does not model the timing of bruise formation.

Appearance selection: Bruising bands use energy below 2 J, 2–12 J, 12–40 J, or at least 40 J. Edge/end contacts use no cut below 10 J, a small cut from 10–24 J, or a larger cut at 24 J and above; broad contacts use a larger cut from 95 J. Bone bands use the existing authored impact index (energy × concentration factor ÷ 3.6): below 10, 10–15, 15–24, 24–36, or at least 36. These thresholds select fictional visual examples and are not validated injury probabilities, pediatric thresholds, or safety limits. The original case uses only its documented surface findings, with no added bruise assessment.

Recreate the Injury: research and assumptions. Kalra et al. (2023), Journal of Biomechanical Engineering tested 10 cadaveric feet in a bodyweight-loaded stance with repeated drop-tower impacts and X-rays. Their fitted 50% fracture points were 35.8 J and 3562 N for that setup. These are not universal injury thresholds or child-specific estimates. This simulation uses the energy scale as context, not the study’s risk curve. Full-text experimental details were not available for calibration.

We calculate E = mgh and v = √(2gh) for a drop from rest, neglecting air resistance and rotation. An optional average contact-force range uses E/d + mg with an assumed stopping distance d of 1–3 cm. It must not be compared directly with the study’s peak-force estimate. See OpenStax: gravitational energy, work and energy, and pressure.

Contact areas are illustrative assumptions: dumbbell 18/6, plate 40/4, and bar 8/3 cm² for broad/edge contact. Injury selection uses energy adjusted by an authored concentration factor (√(18/area), limited to 0.65–1.8). The skin, movement, sensation, fracture count, and displacement cutoffs are teaching choices, not measured clinical thresholds. No validated soft-tissue or pediatric injury function was established by the sources reviewed. All drops use the same exposed, supported virtual forefoot; footwear effects are not simulated. The Royal Children’s Hospital guideline supports falling-object crush injury as a pediatric metatarsal fracture mechanism, with swelling, bruising, and possible unwillingness to bear weight; it does not quantify a safe or fracture-producing drop.

Suggested use: Spend 15–20 minutes in the storyline case. Let students compare appointments, keep evidence with +, =, ×, ?, or ★, and generate a question for the Driving Question Board. Use Recreate the Injury as an optional experiment after examining the original evidence. The notebook accepts different interpretations; symbols are not graded.

Keep the mystery: Students investigate visible structures and function. This model does not explain cell division or how new tissue forms. A change in movement can involve several structures; it does not prove that one specific tissue has healed.

Evidence and drawings: The original-case X-rays use the teacher’s clarification that the 2nd and 3rd metatarsals have partial fractures. Storyline observations are paraphrased from the Lesson 1 ER, post-operation, and recovery reports. Drawings and motion are original, simplified illustrations, not patient photographs, medical scans, measured angles, or continuous records of healing. Each timeline step is one recorded appointment. An X-ray view emphasizes bones; it does not show all injured tissue. Alignment after surgery is not proof of healing.

Missing evidence: “Not reported” means this appointment provides no answer. Later reports do not explicitly confirm full sensation returning. The illustration adds bruising, a small amount of ER bleeding, and gradual scar fading at the teacher’s request. These visual details are examples, not additional findings from the reports. The reports document declining swelling, stitch removal and Steri-Strips on March 19, closed skin on April 2, and pin removal with bandages on April 2; later scar appearance is not described. Visible pin ends are based on the supplied sole photograph. The final report describes improved range of motion, not a measured full range. The activity decision shown is the clinician’s recorded decision for this case.

Experiment trials: Recreate the Injury generates simplified teaching examples. They do not diagnose injuries or predict an individual’s recovery. The drawings emphasize the visible foot and bone evidence, not exact anatomical scale. Healing and participation can look different for different people.

Reference cards: The third tab offers 12 bone-injury cards, 6 cards about bruising, swelling, and scars, and 9 recovery-device cards. Each back links to its medical source. Fracture descriptions may overlap and are not a severity ladder. The generic long-bone illustrations are separate from the original student’s foot X-rays. Outside pictures are generated examples, not diagnostic photographs. Bone bruises are explained using a diagram because ordinary X-rays do not show them. Card saves are labeled Reference in the notebook.

Sources: Adapted from OpenSciEd, Unit 6.6 Cells & Systems, Lesson 1 (ER report 2/26/2018; post-operation report 2/26/2018; recovery reports 3/19, 4/2, 4/16, and 5/16/2018), using the classroom’s edited copies. Injury terminology checked against NIAMS: Sports Injuries and AAOS: Toe and Forefoot Fractures. Foot and bone illustrations were revised using the classroom’s “Combine Images & Report” reference and OpenStax: Bones of the Lower Limb. The figures remain simplified teaching models. Glossary definitions use student-friendly wording, with support from MedlinePlus: Swelling, Cuts and Puncture Wounds, and Numbness and Tingling. Pictures in the glossary are simplified illustrations. Original interface, generated visual assets, controlled X-ray illustrations, and additional cases: Pirl Experimental. This adaptation is not an OpenSciEd endorsement.