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 leg length discrepancy claim, the diagnosis is only the starting point. The records should connect reproducible clinical measurement in a standard position and calibrated standing imaging where clinically required 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 shortening is true or only apparent from pelvic tilt or contracture, 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?
True structural leg-length discrepancy may follow fracture shortening, malunion, pelvic injury, growth disturbance or accepted joint reconstruction.
- Apparent shortening from pelvic tilt, scoliosis, hip or knee contracture is different and should not be inserted into the true-length table.
- The cause and side must be linked to the accepted injury, especially where both legs are abnormal.
Symptoms and findings that matter
The clinical method must be stated. If measured manually, three readings are averaged; available full-length CT may be preferred but should not be ordered solely for this measurement.
For leg length discrepancy, 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 leg length discrepancy, 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 leg length discrepancy 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 leg length discrepancy 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 leg length discrepancy 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 leg length discrepancy, 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 leg length discrepancy, 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 leg length discrepancy 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 leg length discrepancy, 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 leg length discrepancy 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
True discrepancy 0-1.9 cm
0% WPI (0% LEI)The NSW table begins at a verified true discrepancy of 2 cm.
Source: NSW-corrected AMA5 Table 17-4
True discrepancy 2-2.9 cm
3% WPI (8% LEI)Clinical measurement must identify the method. If measured manually, three readings are averaged rather than taking the largest.
Source: NSW-corrected AMA5 Table 17-4
True discrepancy 3-3.9 cm
5% WPI (13% LEI)True structural shortening must be distinguished from apparent shortening caused by pelvic tilt or contracture.
Source: NSW-corrected AMA5 Table 17-4
True discrepancy 4-4.9 cm
7% WPI (18% LEI)This NSW correction replaces the lower value in the base AMA5 table.
Source: NSW-corrected AMA5 Table 17-4
True discrepancy 5 cm or more
8% WPI (19% LEI)The discrepancy still needs reliable bilateral measurement and a causal link to the accepted injury.
Source: NSW-corrected AMA5 Table 17-4
Worked assessment illustrations
These examples paraphrase the assessment reasoning in the source material. They explain method only and are not predicted outcomes.
Illustration 1
True leg shortening after a healed femur fracture
Assumed facts: The unaffected leg measures 82 cm. Three manual readings of the affected leg are 78 cm, 77 cm and 79 cm, giving an average of 78 cm and a true difference of 4 cm.
Method: Manual limb length uses the average of three readings. A 4 cm discrepancy falls within the NSW-corrected 4-4.9 cm row in Table 17-4.
Illustrative outcome: The corrected NSW row is 7% WPI (18% LEI). This deliberately differs from the older base AMA5 example because the NSW correction prevails. It is an illustration, not an estimate for a particular worker.
Source: NSW Guidelines paras 3.8-3.9 and corrected AMA5 Table 17-4; paraphrased from the AMA5 Chapter 17 example
What usually does not increase WPI
Using the largest manual length reading, measuring only one leg or relying on perceived shortening is not the NSW method.
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 leg length discrepancy 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 leg length discrepancy can arise through fracture shortening or malunion after a work accident and pelvic or hip injury altering true limb length. The chronology should identify the actual task or event and when symptoms or function changed.
Work-related leg length discrepancy can arise through joint reconstruction or growth disturbance related to an accepted injury. The chronology should record the actual task or event and the point at which symptoms or function changed.
Common insurer disputes
For leg length discrepancy, an insurer may dispute whether shortening is true or only apparent from pelvic tilt or contracture and whether measurements are consistent. The written decision should be answered with evidence directed to those reasons.
Further disputes about leg length discrepancy may concern whether the discrepancy is caused by the accepted work injury and whether gait or other lower-limb consequences would double count the same loss. 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 leg length discrepancy 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 leg length discrepancy 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 leg length discrepancy 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 leg length discrepancy, 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 leg length discrepancy, 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 leg length discrepancy, 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 leg length discrepancy claims
How can work cause or aggravate leg length discrepancy?
For leg length discrepancy, the relevant work history may include fracture shortening or malunion after a work accident, pelvic or hip injury altering true limb length, and joint reconstruction or growth disturbance related to an accepted injury. 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 leg length discrepancy?
For leg length discrepancy, 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 clinical method must be stated. If measured manually, three readings are averaged; available full-length CT may be preferred but should not be ordered solely for this measurement. 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 leg length discrepancy assessment?
A leg length discrepancy 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 leg length discrepancy?
For leg length discrepancy, common issues include whether shortening is true or only apparent from pelvic tilt or contracture, whether measurements are consistent, and whether the discrepancy is caused by the accepted work injury. 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 leg length discrepancy affect weekly payments and suitable duties?
Capacity evidence for leg length discrepancy 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 leg length discrepancy automatically receive a fixed WPI percentage?
No. For leg length discrepancy, one verified example is true discrepancy 0-1.9 cm: 0% WPI (0% LEI), under NSW-corrected AMA5 Table 17-4. That value applies only when its stated criteria are met. Using the largest manual length reading, measuring only one leg or relying on perceived shortening is not the NSW method.
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.