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 hip replacement claim, the diagnosis is only the starting point. The records should connect pre-operative imaging and specialist opinion explaining why replacement was required and operation report identifying the prosthesis and procedure 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 the replacement relates to the accepted work injury or pre-existing arthritis, 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?
A total hip replacement or hemiarthroplasty may follow an accepted femoral neck fracture, post-traumatic arthritis, avascular necrosis or other accepted hip pathology.
- Replacement assessment concerns the stable result, including pain, limp, walking distance, aids, stairs, sitting, shoes and socks, public transport, fixed deformity, limb length and hip motion.
- Revision surgery, loosening, dislocation or infection requires current orthopaedic evidence and may mean the condition has not stabilised.
Symptoms and findings that matter
AMA5 Table 17-34 adds all prescribed hip replacement points. NSW treats six blocks as 600 metres and three blocks as 300 metres, and hemiarthroplasty is rated the same as total replacement.
For hip replacement, 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 hip replacement, 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 hip replacement 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 hip replacement 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 hip replacement 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 hip replacement, 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 hip replacement, 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.
For hip replacement, hip flexion brings the knee towards the chest; extension moves the leg behind the body; abduction and adduction move it away from and towards the midline; internal and external rotation turn the thigh inward and outward.
Arthritis in an assessment of hip replacement 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 hip replacement, 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 hip replacement 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
Illustrated fair hip replacement result
78 points: 50% LEI or 20% WPIThis is the result of a completed points calculation, not an automatic value for hip surgery.
Source: AMA5 Tables 17-33 and 17-34, subject to NSW paras 3.29-3.30
Worked assessment illustrations
These examples paraphrase the assessment reasoning in the source material. They explain method only and are not predicted outcomes.
Illustration 1
Total hip replacement points converted to WPI
Assumed facts: Assume slight pain and limp, cane use, 600-metre walking tolerance, rail use on stairs, easy shoes and socks, one-hour sitting tolerance, public transport use, no fixed deformity or contracture, 1 cm discrepancy and measured hip motion producing a total of 78 points.
Method: AMA5 Table 17-34 adds the prescribed pain, function, deformity and movement points. NSW paragraph 3.30 treats six blocks as 600 metres and three blocks as 300 metres.
Illustrative outcome: A 78-point hip result is fair. AMA5 Table 17-33 converts that assumed result to 50% LEI or 20% WPI. This paraphrased example is not a prediction for an individual worker.
Source: NSW Guidelines paras 3.29-3.30; AMA5 Tables 17-33 and 17-34; paraphrased from the supplied AMA5 companion
What usually does not increase WPI
A hip prosthesis, cane or continuing pain does not select a category until every prescribed score item is completed.
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 hip replacement 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 hip replacement can arise through a femoral neck or acetabular fracture and post-traumatic arthritis after an accepted hip injury. The chronology should identify the actual task or event and when symptoms or function changed.
Work-related hip replacement can arise through work aggravation of accepted hip pathology leading to replacement where medically supported. The chronology should record the actual task or event and the point at which symptoms or function changed.
Common insurer disputes
For hip replacement, an insurer may dispute whether the replacement relates to the accepted work injury or pre-existing arthritis and whether the post-operative result has stabilised. The written decision should be answered with evidence directed to those reasons.
Further disputes about hip replacement may concern whether pain, function, movement and walking distance have been measured correctly and whether duties exceed safe mobility and hip precautions. 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 hip replacement may involve orthopaedic follow-up, physiotherapy, gait rehabilitation and management of complications 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 hip replacement 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 hip replacement, 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 hip replacement, 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 hip replacement, 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 hip replacement claims
How can work cause or aggravate hip replacement?
For hip replacement, the relevant work history may include a femoral neck or acetabular fracture, post-traumatic arthritis after an accepted hip injury, and work aggravation of accepted hip pathology leading to replacement where medically supported. 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 hip replacement?
For hip replacement, 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. AMA5 Table 17-34 adds all prescribed hip replacement points. NSW treats six blocks as 600 metres and three blocks as 300 metres, and hemiarthroplasty is rated the same as total replacement. 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 hip replacement assessment?
A hip replacement 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 hip replacement?
For hip replacement, common issues include whether the replacement relates to the accepted work injury or pre-existing arthritis, whether the post-operative result has stabilised, and whether pain, function, movement and walking distance have been measured correctly. 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 hip replacement affect weekly payments and suitable duties?
Capacity evidence for hip replacement 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 hip replacement automatically receive a fixed WPI percentage?
No. For hip replacement, one verified example is illustrated fair hip replacement result: 78 points: 50% LEI or 20% WPI, under AMA5 Tables 17-33 and 17-34, subject to NSW paras 3.29-3.30. That value applies only when its stated criteria are met. A hip prosthesis, cane or continuing pain does not select a category until every prescribed score item is completed.
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.