Rapid Upper Limb Assessment RULA History and Benefit

Rapid Upper Limb Assessment (RULA)

History and Benefit of RULA n n n Developed by Dr. E. Nigel Corlett and Dr. Lynn Mc. Atamney of University of Nottingham’s Institute for Occupational Ergonomics Developed to “investigate the exposure of individual workers to risk factors associated with work-related upper limb disorders” “It is straight forward and can be used with a minimum of training. ”

What is RULA n n n RULA is a quick survey method for use in ergonomic investigations of workplaces where MSD’s are reported. RULA is a screening tool that assesses biomechanical and postural loading on the body. RULA focuses on the neck, trunk and upper limbs, and is ideal for sedentary workers e. g. computer workplaces.

What is RULA (cont. ) n n RULA has been validated on groups of computer users and sewing machine operators. RULA is quick and easy to complete. RULA scores indicate the level of intervention required to reduce MSD risks. RULA compliments other ergonomic methods.

4 Main Applications of RULA 1. 2. 3. 4. Measures musculosceletal risk, usually as part of a broader ergonomic investigation Compare the musculosceletal loading of current and modified workstation design Evaluate outcomes such as productivity or suitability of equipment Educate workers about musculosceletal risk created by different working postures

RULA Scoring Classification n CLASS I (1 or 2) n n CLASS II (3 or 4) n n Further investigation is needed CLASS III (5 or 6) n n Posture is acceptable if it is not maintained or repeated for long periods Further investigation and changes are required soon CLASS IV (6+) n Investigate and change now

Interpretation of RULA n n Gives a total job assessment that suggests directions for modifying body positions to reduce the possibility of hazards Does not provide exact Engineering controls or work activity changes.

How to Do a RULA Estimation n n RULA is a simple diagnostic tool that allows you to survey various tasks involving the upper limbs at work. Focuses on use of arms, wrists, position of the head, and the posture of the upper body.

RULA Estimation (cont. ) n Procedure n n Records the position of the upper limbs and the head, trunk and legs with two separate number codes. The codes are entered into the relevant boxes. An initial score is found in the appropriate tables, A and B. The score is modified according to the use of the limbs.

RULA Estimation (cont. ) n n The final A and B scores are calculated. Using the final scores a Grand Score, using table C, is determined.

Upper Arm

Upper arm

Upper Arms n n n Add 1 if shoulder is raised Add 1 if upper arm is abducted Subtract 1 if leaning or supporting the weight of the arm.

Lower Arm n Add 1 if working across the midline of the body or out to the side.

Lower arm

Wrist

Wrist Twist n n Mainly in handshake Twisting away from handshake position.

wrist

Neck

Neck Twist n Add 1 if neck is twisting

Neck Side-Bend n Add 1 if neck is side-bending.

neck

Trunk

Trunk Twisting n Add 1 if trunk is twisting.

Trunk Side-Bend n Add 1 if trunk is side-bending.

Lower Limbs n n Legs and feet are well supported and in an evenly balanced posture (add 1). Legs and feet are not evenly balanced or supported (add 2).

Trunk Go to

Muscle Use Score n Raise the score by 1 if the posture is” n n Mainly static, e. g. held for longer than 10 minutes. Repeated more than 4 times/minute.

Forces or Load Score 0 No resistance or less than 4 lbs intermittent load or force 1 4 -20 lbs intermittent load or force 2 4 -20 lbs static or repeated load or force 3 More than 20 lbs static or repeated loads or forces. Shock or forces with rapid buildup.

Score Sheet Upper Arm Lower Arm Wrist Twist Posture Score A Muscle Use + ck Ne Trunk s Leg Posture Score B Muscle Use + Force /Load + Force / Load + = Score B = Score A Look Up in Table C for Grand Score

Arms and Wrist Score Wrist 1 2 3 4 Wrist Twist Upper Arm Lower Arm 1 1 1 2 2 3 3 3 2 3 3 3 4 4 2 1 2 2 2 3 3 3 4 4 3 2 3 3 4 4 5 3 1 2 3 3 3 4 4 5 5 2 2 3 3 3 4 4 5 5 3 2 3 3 4 4 4 5 5 4 1 3 4 4 4 5 5 2 3 4 4 4 5 5 3 3 4 4 4 5 5 6 6 5 1 5 5 5 6 6 7 2 5 6 6 7 7 7 3 6 6 6 7 7 8 6 1 7 7 7 8 8 9 2 7 8 8 9 9 9 3 9 9 9 9 1 2 1 2

Neck, Trunk, and Legs Score

RULA Estimation

RULA Estimation (cont. )

Contoh Kasus Tentukan level risiko seorang pekerja yang bertugas mengoperasikan mesin AIDA seperti yang terlihat pada gambar. Tahanan yang harus ditanggung oleh pekerja adalah 10 lbs dalam posisi statis lebih dari 10 menit dan bahu terangkat. Terkadang pekerja harus menggerakkan pergelangan tangan ke arah radial dan ulnar. Gunakan RULA untuk menentukan level risiko.

References n n n Mc. Atamney, L. & Corlett, E. N. (1993) RULA: a survey method for the investigation of workrelated upper limb disorders, Applied Ergonomics, 24, 91 -99 http: //www. ergonomics. co. uk/Rula/Ergo/ index. html Stanton, N, A. Hedge dan K. Brookhuis. Handbook of Human Factors and Ergonomics Methods. CRC Press, 2005.