01
Small entry point
A tiny puncture, red mark or small cut may be the only visible sign at first.
Water Jet Injuries
A tiny puncture mark can hide severe internal damage. High-pressure water can track under the skin, carry bacteria deep into tissue, and cause injury far beyond the visible entry point.
What they are
The visible wound is often the least useful clue.
Water jetting injuries are high-pressure injection injuries. The jet can puncture skin like a pin prick, then force water, debris, chemicals and bacteria into deeper tissue planes.
The person may feel the injury is minor because the entry mark is small. In reality, pressure can separate tissue, damage muscle and ligaments, threaten bone, and create a serious infection risk.
02
Deep tracking
Injected fluid can move along the arm, hand or limb under the skin.
03
Internal damage
Muscle, ligaments, tendons, nerves and bone may be affected away from the entry point.
04
Bacteria risk
Contamination can be driven deep into tissue, raising the risk of severe infection.
How it happens
Pressure drives the injury beyond the point of contact.
1
The jet strikes the skin and creates a small entry wound.
2
Water and contamination are injected beneath the skin instead of staying at the surface.
3
Pressure can separate tissues and track along the arm towards joints and deeper structures.
4
What looks minor can become a limb-threatening medical emergency.
Example scenarios
The injury story often starts with "it does not look that bad".
These examples are deliberately obscured placeholders. Replace them with approved, consented and blurred case images when they are available.
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Pin-prick hand wound
A small puncture after lance contact may hide injected contamination and tendon-sheath involvement.
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Forearm tracking
Pain, swelling or tightness away from the puncture may suggest fluid has travelled under the skin.
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Delayed deterioration
Symptoms may worsen after the job has stopped, especially where bacteria or debris have been injected.
What to do
Open the Algorithm
Treat every suspected injection injury as urgent.
Do not judge severity by the size of the mark. The priority is rapid escalation, clear information for medical teams, and use of the WJA injury treatment algorithm.
Stop and make safe
Stop work, isolate equipment, and get the injured person away from further risk.
Escalate early
Seek urgent medical assessment and make clear that this is a high-pressure water injection injury.
Share the details
Provide pressure, fluid type, contamination risk, time of injury and any chemicals involved.
Monitor deterioration
Pain, swelling, numbness, tightness, discolouration or feeling unwell should be escalated immediately.
Further action
Link the learning back into site safety.
Use the algorithm for injury response, safety alerts for real incident learning, and WJA support routes for reporting or specialist guidance.
