# SLIP OR FALL OF PERSON
> MSHA accident `220043490015` · 12/03/2004 · BHP Navajo Coal Company
## Details
- **Degree of injury:** DAYS AWAY FROM WORK ONLY
- **Classification:** SLIP OR FALL OF PERSON
- **Accident type:** Over-exertion NEC
- **Occupation:** Maintenance man, Mechanic,  Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech
- **Activity:** Walking, Running
- **Injury source:** STEPS
- **Nature of injury:** SPRAIN,STRAIN RUPT DISC
- **Body part:** KNEE/PATELLA
- **Days lost:** 40
- **Mine experience:** 13.75 years
## Operator
- **Controller:** BHP Billiton
- **Operator:** BHP Navajo Coal Company
- **Mine:** [2900097](https://api.ai-analytics.org/mine/2900097)
## Narrative

The employee was egressing from his work station (down the coal plant control tower stairway) to perform hopper cleaning duties.  As he was coming down the stairway he twisted his knee and heard a pop in his left knee as he stepped down from the last step. His left knee was termed a strain at the medical facility and was returned back to work without restrictions.

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*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · AI Analytics · CC0 1.0*