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 lower limb nerve injury claim, the diagnosis is only the starting point. The records should connect neurological examination mapping sensory and motor loss and EMG or nerve conduction studies that match the clinical pattern with the worker's practical limits, including standing, walking, stairs, kneeling, squatting, driving and load carrying and safe duties that avoid unsafe mobility demands. If the insurer disputes whether symptoms follow a peripheral nerve or lumbar nerve-root distribution, 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 Chapter 3 applies AMA5 Chapter 17 only as modified by NSW. Paragraphs 3.2-3.7 require the most specific valid method, selection of the highest valid evaluation where more than one method applies, common units before combination, and a 40% WPI lower-limb maximum.
- NSW Guidelines para 1.24: activities of daily living must not be used to increase or reduce a calculated lower-extremity impairment. Functional examples explain the measurement; they are not an extra percentage.
- NSW Guidelines paras 3.8-3.15 and corrected AMA5 Tables 17-4 and 17-6: true leg length, gait, unilateral atrophy and manual muscle testing each have their own measurement and non-combination requirements.
- NSW Guidelines paras 3.16-3.18: inconsistent range-of-motion findings are invalid; values from different movement planes within one joint are added; joint ankylosis uses the corrected NSW optimum-position table and positional additions.
- NSW Guidelines paras 3.19-3.24: arthritis means radiological cartilage loss for impairment purposes. It cannot be assumed from pain, and the arthritis method cannot be combined with gait, atrophy, strength or range of motion.
- NSW Guidelines paras 3.10-3.15 and 3.32-3.35: gait is a last resort; gait, atrophy, muscle testing and peripheral-nerve methods can duplicate lower-limb function and must follow Table 17-2 non-combination rules; CRPS uses the NSW Chapter 17 method rather than AMA5 Chapter 18 pain.
- NSW Guidelines paras 3.26-3.30 and Tables 3.2-3.4: NSW modifies diagnosis-based estimates, tibial plateau fracture, patello-femoral and ankle replacement, tibia-os calcis angle and persistent plantar fasciitis. Hip and total-knee replacements use AMA5 Tables 17-33 to 17-35 subject to the NSW corrections.
What injuries or conditions may be assessed?
Lower-limb peripheral nerve injury can affect the sciatic, femoral, common peroneal, tibial, sural, saphenous, plantar or another named nerve after trauma, compression or surgery.
- A peripheral nerve lesion must be distinguished from lumbar radiculopathy, which concerns a spinal nerve root and usually belongs in the spine DRE assessment.
- The clinically supported deficit may be sensory, motor, dysaesthetic or a combination permitted for that nerve.
Symptoms and findings that matter
The sensory and motor deficit grades are multiplied by the named nerve's maximum values, combined in LEI and converted to WPI. EMG/NCS can support but does not replace a matching clinical pattern.
For lower limb nerve injury, range of motion is normally measured three times in each relevant plane and the greatest valid result is used. If repeated readings or findings between examinations are materially inconsistent, ROM is not a valid impairment parameter.
If true leg length is relevant to lower limb nerve injury, manual measurement is an exception to the greatest-reading rule: three readings are averaged. The opposite joint or limb is also compared where it provides a valid baseline.
Where lower limb nerve injury is assessed through manual muscle weakness, the examiner uses the six Medical Research Council grades from 0 to 5. Those grades are ordinal rather than evenly spaced, and the NSW method uses AMA5 Table 17-8; electrodiagnostic results do not replace the manual muscle test.
An impairment report for lower limb nerve injury may need a diagnosis-based estimate, radiological cartilage-loss method, replacement score, true limb-length difference, unilateral atrophy, muscle grade, named-nerve deficit or gait method instead of, or in a limited case alongside, ROM.
What investigations are usually relevant
Investigations for lower limb nerve injury may include weight-bearing X-rays, CT, MRI, ultrasound or operation records identifying the actual joint, fracture, tendon, ligament, cartilage, prosthesis or nerve condition and repeat goniometer measurements, stability tests, alignment findings and comparison with the unaffected side where that comparison is valid. Each result should answer a defined clinical question and be read with the examination, diagnosis and history.
- Orthopaedic, rehabilitation and physiotherapy records showing whether the condition has reached maximum medical improvement.
- Certificates of capacity and duties evidence about walking, standing, stairs, kneeling, squatting, driving, lifting and uneven ground. These explain claim impact but do not alter the WPI calculation.
How WPI is assessed for this body part
For lower limb nerve injury, NSW Guidelines Chapter 3 applies AMA5 Chapter 17 subject to NSW corrections. The most specific valid method is used, and where more than one valid method applies the highest valid evaluation is generally selected unless Table 17-2 permits a combination.
If ROM is valid for lower limb nerve injury, values in different planes of the same joint are added. Regional values in the same limb are expressed in the same unit and combined before conversion to WPI.
Arthritis in an assessment of lower limb nerve injury requires radiologically measured cartilage loss. For a knee, only the most impaired compartment is used. Arthritis cannot be combined with gait, atrophy, strength or ROM for the same loss.
For lower limb nerve injury, gait remains a last-resort standalone method. Atrophy, manual muscle testing, peripheral nerve impairment and gait can duplicate strength loss and cannot be stacked. A diagnosis-based estimate is combined only where Table 17-2 permits it.
The calculation for lower limb nerve injury cannot be changed because of activities of daily living under NSW paragraph 1.24. Functional descriptions help explain the evidence but are not an uplift or deduction.
Table and value examples
Named lower-limb nerve method
Sensory deficit % x nerve sensory maximum; motor deficit % x nerve motor maximum; combine, then convert LEI to WPIGait, atrophy, weakness or movement caused by the same nerve lesion cannot be rated again.
Source: NSW Guidelines paras 3.32-3.34; AMA5 Tables 16-10, 16-11, 17-3 and 17-37
Worked assessment illustrations
These examples paraphrase the assessment reasoning in the source material. They explain method only and are not predicted outcomes.
Illustration 1
Partial motor loss in the femoral nerve
Assumed facts: Assume an accepted femoral nerve lesion produces a reproducible Medical Research Council grade 4 motor deficit. The assumed motor-deficit severity selected from AMA5 Table 16-11 is 20%, and the femoral nerve's maximum motor value is 37% LEI.
Method: The motor component is 20% x 37% = 7.4%, rounded to 7% LEI. With no separate sensory component in this illustration, Table 17-3 then converts the lower-extremity value to WPI.
Illustrative outcome: Seven per cent LEI converts to 3% WPI. A different grade, nerve or sensory finding changes the calculation, and motion, atrophy, weakness or gait caused by the same nerve loss is not rated again. This paraphrased illustration is not an estimate for an individual worker.
Source: NSW Guidelines paras 1.26, 3.15 and 3.32-3.34; AMA5 Tables 16-11, 17-3 and 17-37; paraphrased from the supplied AMA5 companion
What usually does not increase WPI
Numbness, radiating pain or an abnormal electrodiagnostic result without an anatomically matching examination does not complete the nerve calculation.
Pain, tenderness, swelling or difficulty walking does not create a percentage without a valid lower-limb method.
A scan label, surgery name or recommendation for surgery is not a fixed WPI result.
Work restrictions, weekly payments and inability to resume the pre-injury job are important claim issues but are not themselves impairment measurements.
Activities of daily living cannot be used to increase or reduce the calculated lower-extremity rating.
Evidence checklist
The records for lower limb nerve injury should include the accepted injury description, date and any insurer decision limiting the body part or diagnosis and imaging and operation reports, including the relevant side, level, compartment and procedure. They are most useful when the diagnosis, examination and practical restrictions are consistent.
- Repeat movement, stability, alignment, circumference, limb-length or neurological measurements required by the selected method.
- A calculation worksheet identifying the table, regional unit, permitted combinations, conversion and rounding.
How this injury commonly happens at work
Work-related lower limb nerve injury can arise through direct trauma, fracture or dislocation affecting a nerve and compression from posture, equipment or swelling. The chronology should identify the actual task or event and when symptoms or function changed.
Work-related lower limb nerve injury can arise through surgical or traction injury where accepted. The chronology should record the actual task or event and the point at which symptoms or function changed.
Common insurer disputes
For lower limb nerve injury, an insurer may dispute whether symptoms follow a peripheral nerve or lumbar nerve-root distribution and whether test results match the examination. The written decision should be answered with evidence directed to those reasons.
Further disputes about lower limb nerve injury may concern whether weakness is measurable and anatomically consistent and whether gait consequences are being counted twice. 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 lower limb nerve injury may involve physiotherapy, bracing, injections or specialist care and surgery such as repair, reconstruction, fixation or replacement where supported. The request should explain the expected functional benefit and its connection to the accepted injury.
Further management of lower limb nerve injury may involve rehabilitation planning around stairs, driving and safe mobility and management of flare-ups during graded return to work. The request should explain why the proposed step is connected to the accepted injury and what functional improvement is expected.
Weekly payments and work capacity
Capacity evidence for lower limb nerve injury should address standing, walking, stairs, kneeling, squatting, driving and load carrying and safe duties that avoid unsafe mobility demands. Proposed duties must be sustainable for the proposed hours, not merely possible once.
For lower limb nerve injury, capacity evidence should address travel to work and medication effects where relevant and weekly payment decisions where partial capacity is overstated. 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 lower limb nerve injury, a claim review can help to clarify diagnosis and mechanism of injury and compare work duties with medical restrictions. The purpose is to identify the precise decision and the evidence needed for the next available step, not to promise an outcome.
For lower limb nerve injury, a claim review can help to respond to treatment or work capacity disputes and prepare WPI evidence when the condition becomes stable. 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 lower limb nerve injury claims
How can work cause or aggravate lower limb nerve injury?
For lower limb nerve injury, the relevant work history may include direct trauma, fracture or dislocation affecting a nerve, compression from posture, equipment or swelling, and surgical or traction injury where accepted. 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 lower limb nerve injury?
For lower limb nerve injury, NSW Guidelines Chapter 3 applies AMA5 Chapter 17 subject to NSW corrections. The most specific valid method is used, and where more than one valid method applies the highest valid evaluation is generally selected unless Table 17-2 permits a combination. The sensory and motor deficit grades are multiplied by the named nerve's maximum values, combined in LEI and converted to WPI. EMG/NCS can support but does not replace a matching clinical pattern. 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 lower limb nerve injury assessment?
A lower limb nerve injury assessment commonly needs the accepted injury description, date and any insurer decision limiting the body part or diagnosis, imaging and operation reports, including the relevant side, level, compartment and procedure, repeat movement, stability, alignment, circumference, limb-length or neurological measurements required by the selected method, and a calculation worksheet identifying the table, regional unit, permitted combinations, conversion and rounding. 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 lower limb nerve injury?
For lower limb nerve injury, common issues include whether symptoms follow a peripheral nerve or lumbar nerve-root distribution, whether test results match the examination, and whether weakness is measurable and anatomically consistent. 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 lower limb nerve injury affect weekly payments and suitable duties?
Capacity evidence for lower limb nerve injury may need to address standing, walking, stairs, kneeling, squatting, driving and load carrying, safe duties that avoid unsafe mobility demands, and travel to work and medication effects where relevant. 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 lower limb nerve injury automatically receive a fixed WPI percentage?
No. For lower limb nerve injury, one verified example is named lower-limb nerve method: Sensory deficit % x nerve sensory maximum; motor deficit % x nerve motor maximum; combine, then convert LEI to WPI, under NSW Guidelines paras 3.32-3.34; AMA5 Tables 16-10, 16-11, 17-3 and 17-37. That value applies only when its stated criteria are met. Numbness, radiating pain or an abnormal electrodiagnostic result without an anatomically matching examination does not complete the nerve calculation.
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.