OAR 436-035-0040
Loss of Opposition in Thumb/Finger Amputations

(1)

Loss of opposition is rated as a proportionate loss of use of the digits which can no longer be effectively opposed.

(a)

For amputations which are not exactly at the joints, adjust the ratings in steps of 5%, increasing as the amputation gets closer to the attachment to the hand, decreasing to zero as it gets closer to the tip.

(b)

When the value for loss of opposition is less than 5%, no value is granted.

(2)

The following ratings apply to thumb amputations for loss of opposition:

(a)

For thumb amputations at the interphalangeal level: [Rating not included. See ED. NOTE.]

(b)

For thumb amputations at the metacarpophalangeal level: [Rating not included. See ED. NOTE.]

(3)

The following ratings apply to finger amputations for loss of opposition. In every case, the opposing digit is the thumb: For finger amputations at the distal interphalangeal joint: [Rating not included. See ED. NOTE.]

(4)

When determining loss of opposition due to loss of length in a digit, other than amputation or resection without reattachment, the value is established by comparing the remaining overall length of the digit to the applicable amputation chart under these rules and rated based on the overall length equivalency.

(5)

If the injury is to one digit only and opposition loss is awarded for a second digit, do not convert the two digits to loss in the hand. Conversion to hand can take place only when more than one digit has impairment without considering opposition
[ED. NOTE: Ratings referenced are available from the agency.]
[ED. NOTE: To view attachments referenced in rule text, click here to view rule.]

Source: Rule 436-035-0040 — Loss of Opposition in Thumb/Finger Amputations, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=436-035-0040 (accessed May 26, 2025).

436–035–0001
Authority for Rules 436–035–0002
Purpose of Rules 436–035–0003
Applicability of Rules 436–035–0005
Definitions 436–035–0006
Determination of Benefits for Disability Caused by the Compensable Injury 436–035–0007
General Principles 436–035–0008
Calculating Disability Benefits (Dates of Injury prior to 1/1/2005) 436–035–0009
Calculating Disability Benefits (Date of Injury on or after 1/1/2005) 436–035–0011
Determining Percent of Impairment 436–035–0012
Social-Vocational Factors (Age/Education/Adaptability) and the Calculation of Work Disability 436–035–0013
Findings of Impairment 436–035–0014
Worsened Pre-existing Conditions and Combined Conditions 436–035–0015
Offsetting Prior Awards 436–035–0016
Reopened Claim for Aggravation/Worsening 436–035–0017
Authorized Training Program (ATP) 436–035–0018
Death 436–035–0019
Chronic Condition 436–035–0020
Parts of the Upper Extremities 436–035–0030
Amputations in the Upper Extremities 436–035–0040
Loss of Opposition in Thumb/Finger Amputations 436–035–0050
Thumb 436–035–0060
Finger 436–035–0070
Conversion of Thumb/Finger Values to Hand Value 436–035–0075
Hand 436–035–0080
Wrist 436–035–0090
Conversion of Hand/Forearm Values to Arm Value 436–035–0100
Arm 436–035–0110
Other Upper Extremity Findings 436–035–0115
Conversion of Upper Extremity Values to Whole Person Values 436–035–0130
Parts of the Lower Extremities 436–035–0140
Amputations in the Lower Extremities 436–035–0150
Great Toe 436–035–0160
Second through Fifth Toes 436–035–0180
Conversion of Toe Values to Foot Value 436–035–0190
Foot 436–035–0210
Conversion of Foot Value to Leg Value 436–035–0220
Leg 436–035–0230
Other Lower Extremity Findings 436–035–0235
Conversion of Lower Extremity Values to Whole Person Values 436–035–0250
Hearing Loss 436–035–0255
Conversion of Hearing Loss Values to Whole Person Values 436–035–0260
Visual Loss 436–035–0265
Conversion of Vision Loss Values to Whole Person Values 436–035–0330
Shoulder Joint 436–035–0340
Hip 436–035–0350
General Spinal Findings 436–035–0360
Spinal Ranges of Motion 436–035–0370
Pelvis 436–035–0375
Abdomen 436–035–0380
Cardiovascular System 436–035–0385
Respiratory System 436–035–0390
Cranial Nerves/Brain 436–035–0395
Spinal Cord 436–035–0400
Mental Illness 436–035–0410
Hematopoietic System 436–035–0420
Gastrointestinal and Genitourinary Systems 436–035–0430
Endocrine System 436–035–0440
Integument and Lacrimal System 436–035–0450
Immune System 436–035–0500
Rating Standard for Individual Claims

May 26, 2025

Rule 436-035-0040's source at or​.us