# SLIP OR FALL OF PERSON
> MSHA accident `220120060035` · 12/31/2011 · 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:** Climb scaffolds, Ladders
- **Injury source:** LADDERS,NEC
- **Nature of injury:** SPRAIN,STRAIN RUPT DISC
- **Body part:** KNEE/PATELLA
- **Days lost:** 156
- **Mine experience:** 34.54 years
## Operator
- **Controller:** BHP Billiton
- **Operator:** BHP Navajo Coal Company
- **Mine:** [2900097](https://api.ai-analytics.org/mine/2900097)
## Narrative

Employee was exiting down a boarding ladder, from work plaform and felt the knee pop.

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