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How this assessment usually works
Upper limb impairment assessment usually turns on the exact body part, diagnosis, movement findings, strength or nerve findings, surgery and the duties the worker can no longer safely do. A shoulder tear, wrist fracture and hand nerve injury are not assessed in the same practical way.
The assessor does not decide legal liability. The assessment is a medical opinion about permanent impairment under the NSW workers compensation guidelines. The legal importance is what the percentage does to Section 66, weekly payments, medical expense time limits, settlement strategy or work injury damages preparation.
Step 1
Accepted injury
Check the accepted injury wording, body system and mechanism before looking at the percentage.
Step 2
Medical method
Check whether the correct NSW guideline method, clinical findings and records were used.
Step 3
Claim effect
Check what the WPI percentage changes before accepting a report or settlement position.
How the assessment pathway is usually built
A useful WPI report should show its working. For shoulder, arm and hand, the pathway usually needs these steps before anyone relies on the percentage.
Identify the exact upper-limb part first: shoulder, elbow, wrist, hand, thumb, finger, tendon, peripheral nerve or vascular disorder. The AMA5 upper-extremity chapter uses different conversion pathways for different regions.
Confirm whether impairment is first expressed as digit, hand, upper extremity or whole person impairment. The report should show the conversion pathway rather than jump straight to WPI.
Check whether the method is based on range of motion, nerve deficit, amputation value, diagnosis-based disorder, arthritis, tendon injury, strength or another permitted pathway.
Where movement is measured, the report should explain measurement consistency and whether pain, guarding or inconsistent effort affected the findings.
If several impairments exist in the same limb, the report should explain whether they are added, combined or limited by an amputation maximum.
Assessment method points from the NSW guideline
These points are not a self-calculation tool. They are practical checks for whether the WPI report is using the right body-system method and reasoning.
Upper limb assessment uses AMA5 Chapter 16 with NSW modifications. The report should identify whether it is rating thumb, fingers, hand, wrist, elbow, shoulder, tendon, nerve or vascular disorder.
Upper-limb impairment is often calculated regionally first and converted to WPI. A sound report should show each conversion step.
Multiple impairments for the same joint or limb are not always handled the same way. Some values are added, some are combined, and the final value cannot exceed the relevant amputation value.
Range of motion should be measured carefully and consistently. Inconsistent movement findings should not be used without explanation.
Peripheral nerve impairment should identify the nerve, sensory deficit, motor deficit and whether the same loss has already been captured by another method.
Carpal tunnel, digital nerve lesions, tendon rupture, epicondylitis, impingement and overuse conditions need the correct specific pathway; a diagnosis label alone is not enough.
Strength loss should be used cautiously and only where the Guides permit it; it should not be a back-door rating for pain, effort or a restriction already captured elsewhere.
The report should distinguish WPI from practical hand use at work. Grip, overhead work, fine motor use and tool handling may be highly important for capacity even where the WPI number is modest.
What can change the WPI percentage
The final percentage can move because of method selection, objective findings, surgery, pre-existing deduction, or how multiple impairments are combined. These are the practical pressure points for this injury type.
- Measured active range of motion and whether repeated measurements are consistent.
- Sensory and motor nerve deficit findings, including nerve conduction studies where relevant.
- Surgery outcome, residual stiffness, recurrent instability, tendon rupture, hardware and post-operative therapy records.
- Whether the impairment is in the dominant hand may matter functionally, although dominance is not a general automatic WPI uplift under Chapter 16.
- Whether strength loss is legitimately rated; AMA5 treats strength as a limited pathway and it should not double-count movement, pain or deformity already captured elsewhere.
What the assessor usually checks
- which body part is accepted: shoulder, elbow, wrist, hand, fingers, tendon or nerve
- whether surgery, imaging and therapy notes were available
- range of motion, strength, sensation and functional use of the arm or hand
- dominant-hand impact and whether the worker's actual job duties were recorded
- whether overuse or repetitive work has been treated as work-related aggravation or dismissed as ordinary degeneration
Evidence that may help
A useful WPI report depends on the material the assessor receives. These records often matter for shoulder, arm and hand:
- ultrasound, MRI, X-ray, nerve conduction study or surgical records
- orthopaedic, hand surgeon, neurologist, physiotherapist or hand therapist reports
- photos or duty records showing tools, gripping, lifting, keyboarding or repetitive tasks
- certificates of capacity recording lifting, reaching, gripping, overhead work and fine-motor restrictions
- failed return-to-work records where duties exceeded medical restrictions
Common insurer or report disputes
- the report treats a tear as degenerative without dealing with work contribution
- dominant-hand restriction is understated
- nerve symptoms are recorded but not analysed
- the assessor did not consider surgery or post-operative stiffness
- capacity for suitable duties is assumed from a limited examination snapshot
Report cautions before relying on the percentage
Report red flags
- The report gives a WPI figure without showing digit, hand, upper extremity or whole person conversions.
- Dominant-hand disability is ignored in the functional history even though the worker uses tools, typing, gripping or fine motor tasks.
- A nerve complaint is recorded but the report does not identify sensory/motor findings or the nerve pathway.
- Overuse is dismissed as ordinary degeneration without analysing actual repetition, force, posture or work exposure.
Method and reliance checks
- Does the report convert digit, hand or upper extremity impairment to WPI correctly?
- Are same-limb regional impairments added or combined according to the correct method?
- Does it identify the dominant hand and real work function without treating WPI as a work-capacity opinion?
- If strength is rated, does the report justify why strength assessment is permitted and not already captured by movement, pain or deformity?
- Were imaging, operation notes, hand therapy records, nerve studies and certificates of capacity provided?
- Does the report explain why any pre-existing arthritis or degeneration deduction is made?
- Surgical improvement does not always mean normal function, but post-operative stiffness still needs objective support.
- Overuse claims often need work-duty evidence, not only a diagnosis label.
- Nerve conduction results, hand therapy notes and operative findings may change the impairment pathway.
Guideline notes
- NSW upper extremity assessment modifies AMA5 Chapter 16.
- The maximum upper limb rating cannot exceed the relevant amputation value.
Questions to ask when the report comes back
How this connects to thresholds and strategy
SIRA says permanent impairment compensation generally requires 11% or more permanent impairment for physical injury, and 15% or more for primary psychological injury. Secondary psychological injury is treated differently. Those thresholds are not a payout promise; they are eligibility and strategy checkpoints that need to be applied to the accepted injury and current evidence.
A low WPI opinion may also affect weekly-payment planning, treatment time-limit issues, dispute posture, and whether work injury damages threshold advice is required. The safest approach is to review the method, evidence and consequences before signing or letting the insurer rely on a weak assessment.
Questions workers often ask
Is shoulder, arm and hand assessed the same way as every other injury?
No. NSW permanent impairment assessment depends on the accepted injury, body system, medical evidence, maximum medical improvement and any NSW-specific guideline modification. The assessment method for shoulder, arm and hand should be checked against the injury actually accepted in the claim.
Can I calculate the WPI percentage myself?
No. A trained permanent impairment assessor must perform the assessment. A worker can still check whether the report used the correct injury description, records, body system, causation assumptions and deduction reasoning.
What if the insurer report seems too low?
Ask for the report and the material sent to the assessor. For shoulder, arm and hand, compare the report against treating records, imaging, specialist material, work duties and certificates of capacity before accepting the percentage or relying on it for settlement strategy.
Does maximum medical improvement matter?
Yes. SIRA guidance says permanent impairment assessment should occur when the condition has stabilised and is unlikely to change substantially in the next year with or without treatment. If treatment is incomplete, the timing may need review.
General information only
This information is general in nature and is not legal advice. You should obtain advice about your own circumstances before relying on a WPI percentage, accepting a lump sum offer, or responding to an insurer decision.
Reviewed by NSW Work Injury Claims - a branch of Stephen Young Lawyers.
Related injury and impairment pages
Need a WPI assessment checked?
If the percentage does not match the accepted injury, treatment history, imaging, surgery, work duties or current restrictions, get the report checked before accepting the insurer position.