Diagnostic Assessment — Lumbar - Spondylolisthesis
Example 1 of 1 · fictitious patient (Veteran Q)
Diagnostic Assessment
Lumbar - Spondylolisthesis
Balance of Probabilities: SOP 14/2023 - Thoracolumbar Spondylosis Reasonable Hypothesis: SOP 15/2023 - Thoracolumbar Spondylosis
ADF History
The veteran served as Officer Aviation - Pilot, enlisted 01 October 2016, discharged 06 July 2018.
Occupational History
The role of Officer Aviation - Pilot in the Royal Australian Air Force involves unique occupational hazards due to the physical and environmental demands of operating high-performance aircraft. Pilots are exposed to high gravitational forces, repetitive vibrational stress, and prolonged seated postures in confined cockpits, which can contribute to musculoskeletal injuries, particularly to the spine. The documented injury exemplifies the acute biomechanical stress associated with this role, where such forces can compress the spine and potentially lead to conditions like spondylolisthesis through repetitive or acute mechanical loading of the vertebral structures.
History
The veteran the veteran a Pilot Officer in the RAAF, sustained a lumbar spine injury on 03 Apr 2018 during a high G-force maneuver while flying an Air Force aircraft at the RAAF base, experiencing a rapid 6.2G pull that resulted in the development of grade 1 spondylolisthesis of L5 on S1.
Timeline
- 03 Apr 2018: The veteran experienced a rapid 6.2G pull during a flight training exercise, as recorded by the aircraft's Sentinel data system. This high gravitational force subjected his lumbar spine to significant compressive and shear stress, initiating the pathological process that would later be identified as spondylolisthesis. The incident occurred during recovery from a nose-down maneuver, with the acute biomechanical trauma exceeding the structural capacity of the L5 vertebral segment and associated pars interarticularis.
- 10 Apr 2018: Initial medical presentation revealed the onset of symptoms following the G-force incident, with clinical findings of mechanical back pain and localized tenderness at L2/3. While the acute strain was the primary focus of initial assessment, the underlying structural damage that would manifest as spondylolisthesis was likely initiated during this traumatic event, though not yet radiologically apparent.
- 19 May 2018: Physiotherapy assessment documented progression of symptoms with findings suggestive of likely disc herniation at L2-4 with associated sciatica. The clinical presentation included dull left lumbar pain radiating to the posterior thigh when sitting, with tenderness noted centrally at L3/4 and paraspinally at L2/3, indicating the evolving nature of the spinal pathology initiated by the original trauma.
- 23 Jul 2018: Definitive imaging with MRI lumbar spine confirmed the diagnosis, revealing suspected bilateral pars defects of L5 associated with grade 1 spondylolisthesis of L5 on S1 with a 4mm forward shift. The study identified the structural abnormality that had developed following the initial trauma, with associated mild bilateral foraminal stenosis at L5/S1 and potential irritation of the L5 nerve roots.
- 14 Aug 2018: Confirmatory CT scan provided definitive anatomical detail, corroborating the MRI findings of bilateral pars defects of L5 and grade 1 spondylolisthesis of L5 on S1. This imaging modality offered superior bony detail to confirm the structural defects and vertebral displacement that had resulted from the original traumatic incident.
Symptoms
At the time of injury on 03 Apr 2018, the veteran experienced the acute onset of lumbar spine symptoms following exposure to 6.2G forces during flight operations. The initial presentation involved mechanical-type lower back pain with associated symptoms that would later be understood as manifestations of the developing spondylolisthesis.
Following the injury, symptoms evolved to include persistent left-sided lower back pain with characteristic radicular features. The clinical presentation included radiating pain extending into the left leg, numbness through the buttock and left leg distribution, and sciatica particularly evident during bending and squatting movements. Associated neurological symptoms included left foot dragging during ambulation and post-urination dribble, suggesting involvement of nerve root function secondary to the vertebral displacement.
Current symptoms as documented in medical records demonstrate ongoing left L5 radiculopathy with persistent radiating pain, numbness, and functional impairment. The condition significantly impacts daily activities, particularly sitting tolerance, reflecting the mechanical nature of the spondylolisthesis and its effect on neural structures. The symptom pattern remains consistent with grade 1 forward displacement of L5 on S1 and associated foraminal stenosis affecting the exiting nerve roots.
Imaging
30 May 2018: Initial MRI brain and spine performed with demyelination protocol showed no significant findings related to the lumbar spine injury due to inappropriate imaging protocol focused on multiple sclerosis evaluation rather than structural spinal pathology.
23 Jul 2018: MRI lumbar spine revealed suspected bilateral pars defects of L5 associated with a grade 1 spondylolisthesis of L5 on S1 with 4mm forward shift of L5 on S1, mild bilateral foraminal stenosis at L5/S1, and mild diffuse posterior disc bulges at L1/2, L2/3, L3/4, and L4/5.
14 Aug 2018: CT lumbar spine confirmed bilateral pars defects of L5 with grade 1 spondylolisthesis of L5 on S1, providing definitive anatomical confirmation of the structural abnormalities identified on MRI.
1. What is the formal diagnosis of the condition claimed above?
Lumbar Spondylolisthesis, SOP 14/2023 - Thoracolumbar Spondylosis (Balance of Probabilities), SOP 15/2023 - Thoracolumbar Spondylosis (Reasonable Hypothesis), ICD-10 code M43.16.
Spondylolisthesis represents a condition characterized by the forward displacement of one vertebral body relative to the vertebra below it. In this case, grade 1 spondylolisthesis of L5 on S1 indicates forward slippage of the fifth lumbar vertebra on the first sacral vertebra, with displacement measuring less than 25% of the vertebral body width. The condition typically results from bilateral defects in the pars interarticularis (spondylolysis), which compromise the structural integrity of the posterior vertebral arch and allow anterior translation of the vertebral body. The pathophysiology involves mechanical instability leading to progressive displacement, often associated with nerve root compression and radicular symptoms due to foraminal narrowing and neural impingement.
The temporal relationship demonstrates that the spondylolisthesis developed as a consequence of the acute traumatic injury sustained on 03 Apr 2018, with structural damage to the pars interarticularis occurring during the high G-force incident and subsequent progressive displacement manifesting over the following months until radiological confirmation.
2. For each diagnosis identified, please also provide the following dates:
When did the veteran first experience symptoms attributable to this condition?
The veteran first experienced symptoms attributable to spondylolisthesis on 03 Apr 2018 following the high G-force incident during flight operations, though the specific radicular symptoms became more apparent in subsequent weeks as the structural displacement progressed [INTAKE2.docx; IMAGING.pdf, Pages 1-2].
When did the veteran first present to a health / medical provider for this condition?
The veteran first presented for medical assistance on 10 Apr 2018 to a medical officer at the base Health Centre, initially for evaluation of lumbar strain symptoms that were subsequently understood to be manifestations of the developing spondylolisthesis [INTAKE - the veteran McCary - DIA1.docx; CLAIMs.pdf, Page 3].
When was the condition confirmed / formally diagnosed?
The condition was confirmed and formally diagnosed on 23 July 2018 through MRI lumbar spine performed by the treating doctor, with subsequent confirmatory CT imaging on 14 August 2018 [IMAGING.pdf, Pages 1-2; DVA-Determination-Letter-Accepting-Lumbar-Spondylosis-21-03-25.pdf, Page 5].
When did the veteran first present to you (or your practice) for this condition?
27 October 2017.
3. How was this diagnosis confirmed? i.e. what were the key symptoms and signs, investigation results, specialist opinions? Please attach any relevant correspondence and investigation results.
The diagnosis of lumbar spondylolisthesis was confirmed through comprehensive imaging studies and clinical correlation. Key symptoms included left L5 radiculopathy with radiating pain, numbness through the buttock and left leg, sciatica during bending and squatting, and associated neurological symptoms including left foot dragging and post-urination dribble. MRI lumbar spine on 23 July 2018 identified suspected bilateral pars defects of L5 with grade 1 spondylolisthesis of L5 on S1, demonstrating 4mm forward shift and associated mild bilateral foraminal stenosis. Confirmatory CT scan on 14 August 2018 provided definitive anatomical detail of the bilateral pars defects and vertebral displacement. Specialist assessment by the treating doctor, neurosurgeon, on 13 November 2018 confirmed the diagnosis and established the relationship to the original traumatic incident [IMAGING.pdf, Pages 1-2; DVA-Determination-Letter-Accepting-Lumbar-Spondylosis-21-03-25.pdf, Page 5].
4. What do you consider to be the cause(s) of the condition in this veteran? Give consideration to constitutional and common risk factors, pre-existing injuries or diseases, and occupational or lifestyle risks, as well as direct causative mechanisms.
Experiencing trauma to the thoracolumbar spine: This factor is MET. The veteran experienced direct trauma to the lumbar spine on 03 Apr 2018 during the high G-force incident, with 6.2G forces recorded by aircraft systems subjecting the thoracolumbar spine to significant biomechanical stress that initiated the pars defects and subsequent spondylolisthesis.
Lifting loads of at least 35 kilograms to a height of at least shoulder height, or lifting loads of at least 45 kilograms to any height: on more than 10 occasions within any 10 year period before the clinical onset of thoracolumbar spondylosis: This factor is NOT MET. While the veteran military service may have involved various physical activities, there is no specific documentation of repetitive heavy lifting meeting these threshold requirements before the clinical onset.
Having inflammatory joint disease in the thoracolumbar spine before the clinical onset of thoracolumbar spondylosis: This factor is NOT MET. No evidence of pre-existing inflammatory joint disease was documented in the medical records or imaging studies.
Being unable to obtain appropriate clinical management for thoracolumbar spondylosis: This factor is MET. There was a significant delay between initial symptom onset on 03 Apr 2018 and definitive diagnosis on 23 July 2018. The initial MRI on 30 May 2018 was performed with an inappropriate demyelination protocol focused on multiple sclerosis rather than structural spine pathology, resulting in missed diagnosis and delayed appropriate management for over three months, constituting inability to obtain appropriate clinical management as established in Brew v Repatriation Commission.
Sequelae
The lumbar spondylolisthesis does not represent a sequelae of another compensable condition but rather developed as a direct consequence of the traumatic G-force incident during military service.
Unintended Consequence
The lumbar spondylolisthesis does not represent an unintended consequence of medical management. The condition resulted from the occupational trauma rather than any medical intervention or treatment.
Inability to Attain Appropriate Medical Management
The inability to attain appropriate medical management factor is MET for lumbar spondylolisthesis. There was a substantial delay between initial symptom onset on 03 Apr 2018 and definitive diagnosis on 23 July 2018, representing over three months of inadequate clinical management. The critical failure occurred with the inappropriate MRI protocol on 30 May 2018, where imaging was performed using a demyelination protocol focused on multiple sclerosis evaluation rather than structural spine assessment, resulting in missed diagnosis of the spondylolisthesis. This diagnostic delay prevented timely implementation of appropriate management strategies and allowed progression of symptoms and functional impairment. The Full Federal Court decision in Brew v Repatriation Commission establishes that inability encompasses both objective and subjective barriers to treatment access, and in this case, the inappropriate diagnostic approach and subsequent delay in proper imaging constituted a systemic barrier to obtaining appropriate clinical management. This delay caused permanent worsening of the condition through continued mechanical stress on the compromised spinal structures and progressive neural impingement.
The percentage contribution of the causes is 100% and significant.
5. Please provide a Health Summary and a medication / prescribing history.
- see attached report
