Intrinsic vs. Extrinsic Fall Factors

Fall risk factors fall into two categories: intrinsic factors (inside the person) and extrinsic factors (in the environment). Understanding which type of factor you're dealing with determines which prevention strategies to apply.

Section 01

Intrinsic Factors — Inside the Person

Intrinsic factors are characteristics of the person themselves that increase fall risk. Many can be improved with treatment or management — but some are permanent features that require ongoing accommodation.

Muscle weakness: Lower extremity strength is critical for balance recovery. Weakness in legs and core — from inactivity, illness, or neurological conditions — reduces the ability to catch a stumble before it becomes a fall.
Gait and balance disorders: Parkinson's disease, stroke, neuropathy, and arthritis all alter the gait pattern in ways that increase instability and fall risk.
Vision impairment: Reduced acuity, contrast sensitivity, and depth perception from cataracts, macular degeneration, or diabetic retinopathy all impair hazard detection. Poor vision is one of the most modifiable fall risk factors — glasses must be worn and updated regularly.
Cognitive impairment: Dementia and delirium impair the judgment, safety awareness, and impulse control that prevent people from making unsafe decisions.
Chronic conditions: Diabetes (neuropathy, hypoglycemia), heart disease (syncope), COPD (dyspnea on exertion), and many others contribute to fall risk through various mechanisms.

Section 02

Extrinsic Factors — In the Environment

Extrinsic factors are characteristics of the home environment that create hazards. These are often the most immediately actionable — you can remove a loose rug today.

Most common extrinsic hazards

Loose rugs and carpeting edges
Inadequate lighting
Clutter in walking paths
Wet or slippery floor surfaces
Uneven outdoor surfaces

Equipment-related hazards

Missing or inadequate grab bars
Toilet seat too low
Bed height too high or too low
Worn or improper footwear
Assistive device in poor condition

Section 03

The Interaction Between Intrinsic and Extrinsic Factors

💡 Why the same hazard affects people differently

A 35-year-old with normal balance might step over a loose rug without incident. An 80-year-old with neuropathy, poor vision, and blood pressure medication might fall on the same rug. The hazard (extrinsic) is the same — but the intrinsic risk profile determines whether it results in a fall.

This is why fall prevention is always individualized. The same environment may be safe for one client and dangerous for another. Always assess the person AND the environment together.

Section 04

Behavioral Factors — A Third Category

Beyond intrinsic and extrinsic factors, behavioral factors — choices made by the client — play a significant role:

Not using prescribed assistive devices: "I don't need it" or "It makes me feel old." Clients frequently abandon canes and walkers when caregivers are not present.
Rushing: Not allowing adequate time for safe transitions, particularly to the bathroom.
Wearing inappropriate footwear: Socks without grip, backless slippers, or loose-fitting shoes on slippery floors.
Getting up without assistance: Particularly at night, when supervision is absent and risk is highest.

Section 05

Prioritizing Your Interventions

✓ Where to focus your energy

You cannot eliminate all intrinsic risk factors — many are permanent features of the client's health. But you can:

1. Eliminate extrinsic hazards — the most immediately actionable intervention
2. Address behavioral factors — through education, reminders, and supervision
3. Report intrinsic concerns — new weakness, vision changes, balance deterioration — to the clinical team for medical evaluation
4. Increase supervision during high-risk activities and times when multiple factors converge