Overview for NSW injured workers
Start with the dispute, not just the diagnosis
May be relevant when
Benefits to check
Legal help is useful when
How this affects your claim in practice
In a trigger finger claim, the diagnosis is only the starting point. The records should connect nerve conduction study, ultrasound or specialist report where relevant and task frequency and force description with the worker's practical limits, including grip strength, keyboarding, tool use, overhead work and lifting tolerance and dominant-hand limits and two-handed tasks. If the insurer disputes whether repetitive work materially contributed, the response should address that reason directly.
Assessment source
- NSW Guidelines for the Evaluation of Permanent Impairment, paras 1.8-1.12: NSW Guidelines control the assessment method and AMA5 is used only where adopted and not modified.
- NSW Guidelines para 1.12: AMA5 Chapter 18 pain is excluded; chronic pain is assessed through the underlying diagnosed condition, while CRPS is assessed under the relevant NSW method.
- NSW Guidelines para 1.15: assessment should usually wait until maximum medical improvement, meaning the condition is stable and unlikely to change substantially in the next year.
- NSW Guidelines para 1.24: the effect on activities of daily living must not be used to increase or reduce an upper-extremity impairment calculated under the applicable upper-limb method.
- NSW Guidelines paras 1.26 and 2.8: values are rounded at each conversion stage; digit impairment converts to hand impairment, hand and other regional values convert to upper-extremity impairment, and AMA5 Table 16-3 converts upper-extremity impairment to WPI.
- NSW Guidelines paras 2.5 and 2.20: active movement is measured with a goniometer or inclinometer, passive movement is recorded for clinical comparison only, unreliable readings should be repeated, and the uninjured opposite limb may provide the worker's normal baseline.
- NSW Guidelines paras 2.8-2.13: values within one joint are added, same-limb regional values must be expressed in a common unit before combination, a deficit caused solely by a peripheral nerve lesion is not also rated as abnormal movement, and strength is used only in rare permitted cases.
- NSW Guidelines paras 2.14-2.20 modify the shoulder, biceps, impingement, joint-surface fracture and epicondylitis methods in AMA5 Chapter 16; para 2.21 directs upper-limb CRPS to the NSW Chapter 17 method rather than an AMA5 Chapter 16 or Chapter 18 pain rating.
- NSW Guidelines para 2.4: maximum upper extremity impairment is 60% WPI, equivalent to amputation through the shoulder.
What injuries or conditions may be assessed?
Trigger finger can involve fracture, tendon rupture or adhesion, joint stiffness or instability, amputation, trigger finger, crush injury or a digital nerve lesion.
- Each digit and affected structure must be measured before conversion; a general hand-pain percentage is not used.
Symptoms and findings that matter
For trigger finger, finger and thumb movement is measured joint by joint. Values within one joint are added before the applicable digit result is converted to the hand.
Where trigger finger involves a digital nerve, static two-point discrimination helps distinguish partial from total sensory loss and the assessor records the affected nerve length and side.
The trigger finger calculation may pass from digit impairment to hand impairment, then upper-extremity impairment and WPI. NSW paragraph 1.26 requires rounding at each stage, not only at the end.
What investigations are usually relevant
Investigations for trigger finger may include hand-therapy measurements for each affected joint and digit, including reproducibility and static two-point discrimination mapped to the named digital nerve and compared with the opposite hand where appropriate. Each result should answer a defined clinical question and be read with the examination, diagnosis and history.
- Operation reports for tendon or nerve repair and imaging for fracture, arthritis or joint-surface injury.
- Clinical sensory and motor examination where a more proximal median, ulnar or radial nerve lesion is suspected.
How WPI is assessed for this body part
The trigger finger assessment starts at the affected joint, tendon, amputation level or digital nerve. It does not begin with a general percentage for hand pain or reduced dexterity.
Movement values within each trigger finger joint are added, then the prescribed AMA5 tables convert digit impairment to hand impairment, hand impairment to upper-extremity impairment and that value to WPI.
Static two-point discrimination is used for a supported digital sensory lesion in trigger finger; a proximal median, ulnar or radial nerve deficit instead uses the named-nerve sensory and motor method.
Restricted movement caused solely by the same nerve lesion is not added again in a trigger finger calculation, and grip strength is not used to duplicate pain, motion loss or nerve dysfunction.
Fine-motor, dressing or tool-use examples help describe trigger finger function, but NSW paragraph 1.24 prevents an ADL adjustment to the calculated upper-extremity value.
Table and value examples
Displaced fracture involving a joint surface
2% upper extremity impairment or 1% WPI where criteria are metThis applies where range-of-motion loss is not enough to rate impairment, movement is painful, and displacement is 2mm or more.
Source: NSW Guidelines para 2.17
Maximum upper extremity impairment
60% WPIThis is the upper extremity maximum, not the expected rating for ordinary shoulder, elbow, wrist or hand claims.
Source: NSW Guidelines para 2.4
Worked assessment illustrations
These examples paraphrase the assessment reasoning in the source material. They explain method only and are not predicted outcomes.
Illustration 1
Trigger finger: converting impairment in two fingers to WPI
Assumed facts: Assume a treated trigger finger leaves stable, measurable digit restriction rather than intermittent catching without permanent impairment. A valid assessment produces 26% index-finger impairment and 40% middle-finger impairment from separate accepted findings.
Method: For this trigger finger illustration, AMA5 Table 16-1 converts the assumed digit values to 5% and 8% hand impairment. The hand values are added to 13%, then Table 16-2 converts 13% hand impairment to 12% upper-extremity impairment.
Illustrative outcome: This shows how the relevant trigger finger findings move through the upper-limb conversion process. AMA5 Table 16-3 converts 12% upper-extremity impairment to 7% WPI. NSW paragraph 1.26 requires rounding at each conversion stage. This paraphrased illustration is not an estimate for any individual claim.
Source: NSW Guidelines paras 1.26 and 2.8; AMA5 Tables 16-1, 16-2 and 16-3
Illustration 2
Trigger finger: partial sensory loss in one digital nerve
Assumed facts: As a separate trigger finger illustration, assume a clinically verified digital sensory lesion is present and is not being inferred from numbness alone. Static two-point discrimination is 8 mm along the full length of the ulnar digital nerve of the ring finger. The assumed examination classifies this as partial, rather than total, sensory loss.
Method: For this trigger finger illustration, Using AMA5 Tables 16-5 to 16-7, the assumed deficit produces 10% ring-finger impairment. The digit value converts to 1% hand impairment, then 1% upper-extremity impairment and 1% WPI, with rounding at each stage.
Illustrative outcome: This shows how the relevant trigger finger findings move through the upper-limb conversion process. The assessment follows the digital sensory method; a complaint of numbness without reproducible two-point discrimination does not produce the same calculation. This paraphrased illustration is not an estimate for any individual claim.
Source: NSW Guidelines paras 1.26 and 2.8-2.10; AMA5 Tables 16-5, 16-6, 16-7, 16-2 and 16-3
What usually does not increase WPI
Pain, tenderness, weakness complaints or an imaging label without a stable measurable impairment.
Passive movement loss used as though it were active movement impairment.
Grip or other strength loss used to duplicate pain, restricted movement, deformity or nerve loss.
An activities-of-daily-living adjustment added to or subtracted from the calculated upper-extremity value.
The same functional loss counted once under a nerve method and again as restricted movement.
Evidence checklist
The records for trigger finger should include the accepted injury description and any dispute notice identifying the body part and diagnosis and repeat active range-of-motion measurements and opposite-side comparison where appropriate. They are most useful when the diagnosis, examination and practical restrictions are consistent.
- Imaging, operative reports and treatment records for the actual tendon, joint, fracture or arthroplasty condition.
- Sensory mapping, motor testing, static two-point discrimination or electrodiagnostic evidence where a nerve lesion is alleged.
- Work-duties and therapy records explaining the practical movement or nerve function affected.
How this injury commonly happens at work
Work-related trigger finger can arise through high-repetition tool, keyboard, scanning or gripping work and sustained wrist or elbow posture. The chronology should identify the actual task or event and when symptoms or function changed.
Work-related trigger finger can arise through forceful hand use and vibration exposure. The chronology should record the actual task or event and the point at which symptoms or function changed.
Common insurer disputes
For trigger finger, an insurer may dispute whether repetitive work materially contributed and whether symptoms are unrelated or constitutional. The written decision should be answered with evidence directed to those reasons.
Further disputes about trigger finger may concern whether modified duties truly reduce repetition and force. The decision notice should identify which issue is relied on and the evidence said to support it.
Treatment and surgery issues
Depending on the diagnosis and treating opinion, management of trigger finger may involve splints, hand therapy, injections, decompression or tendon release where supported. The request should explain the expected functional benefit and its connection to the accepted injury.
Weekly payments and work capacity
Capacity evidence for trigger finger should address grip strength, keyboarding, tool use, overhead work and lifting tolerance and dominant-hand limits and two-handed tasks. Proposed duties must be sustainable for the proposed hours, not merely possible once.
For trigger finger, capacity evidence should address safe duties that avoid repetition or forceful use and weekly payments where partial capacity is disputed. The question is whether those activities can be performed safely, reliably and for the proposed hours—not whether a task can be attempted once.
How NSW Work Injury Claim can help
For trigger finger, a claim review can help to separate diagnosis, work exposure and capacity evidence and test suitable duties against actual hand, wrist, elbow or shoulder demands. The purpose is to identify the precise decision and the evidence needed for the next available step, not to promise an outcome.
For trigger finger, a claim review can help to review treatment denial reasons and IME assumptions and plan WPI or dispute steps where appropriate. The purpose is to identify the precise decision and the evidence needed for the next available step, not to promise an outcome.
Common questions about trigger finger claims
How can work cause or aggravate trigger finger?
For trigger finger, the relevant work history may include high-repetition tool, keyboard, scanning or gripping work, sustained wrist or elbow posture, and forceful hand use. A claim still depends on the actual chronology and medical evidence. The records should identify what changed, when symptoms began or worsened, and how the diagnosed condition affects the worker's duties.
How is WPI assessed for trigger finger?
For trigger finger, the trigger finger assessment starts at the affected joint, tendon, amputation level or digital nerve. It does not begin with a general percentage for hand pain or reduced dexterity. For trigger finger, finger and thumb movement is measured joint by joint. Values within one joint are added before the applicable digit result is converted to the hand. The assessor must apply the NSW Guidelines to the accepted, stable condition; the diagnosis or an operation does not by itself determine a percentage.
Which records are most useful for a trigger finger assessment?
A trigger finger assessment commonly needs the accepted injury description and any dispute notice identifying the body part and diagnosis, repeat active range-of-motion measurements and opposite-side comparison where appropriate, imaging, operative reports and treatment records for the actual tendon, joint, fracture or arthroplasty condition, and sensory mapping, motor testing, static two-point discrimination or electrodiagnostic evidence where a nerve lesion is alleged. Those records are most useful when they describe the same diagnosis, examination findings, treatment history and practical work restrictions.
What does an insurer commonly dispute about trigger finger?
For trigger finger, common issues include whether repetitive work materially contributed, whether symptoms are unrelated or constitutional, and whether modified duties truly reduce repetition and force. The response should address the insurer's stated reason with the relevant chronology, clinical findings, investigations and duties evidence rather than relying on the diagnosis alone.
How can trigger finger affect weekly payments and suitable duties?
Capacity evidence for trigger finger may need to address grip strength, keyboarding, tool use, overhead work and lifting tolerance, dominant-hand limits and two-handed tasks, and safe duties that avoid repetition or forceful use. A certificate should describe what the worker can do safely and sustainably. Proposed duties should then be checked against those restrictions and the real demands of the job.
Does trigger finger automatically receive a fixed WPI percentage?
No. For trigger finger, one verified example is displaced fracture involving a joint surface: 2% upper extremity impairment or 1% WPI where criteria are met, under NSW Guidelines para 2.17. That value applies only when its stated criteria are met. Pain, tenderness, weakness complaints or an imaging label without a stable measurable impairment.
Request a calm claim position review
If you have received an insurer decision or you are unsure how your injury evidence fits together, we can help you identify the issue, organise the documents and consider the next step. Where ILARS funding is approved, eligible legal costs and necessary disbursements may be covered.