Diagnostic Assessment — Left Knee - Patellofemoral Osteoarthrosis
Example 1 of 1 · fictitious patient (Veteran I)
Diagnostic Assessment
Left Knee - Patellofemoral Osteoarthrosis
SOP: Osteoarthritis (Reasonable Hypothesis) Instrument No. 63 of 2014 SOP: Osteoarthritis (Balance of Probabilities) Instrument No. 64 of 2014
ADF History
The veteran, Aircraft Technician (ATECH/AMECH), enlisted approximately June 1986, discharge date not specified (appears to be ongoing service as of 2023).
Occupational History
As an Aircraft Technician in the Royal Australian Air Force, the veteran the veteran was responsible for maintenance, repair, and servicing of aircraft and associated systems. This role involved working in high-risk environments such as flight lines, engine bays, and maintenance hangars, exposing him to occupational hazards including prolonged kneeling, squatting, climbing aircraft, repetitive movements, heavy lifting, and working in confined spaces. The physical demands of aircraft maintenance required sustained periods in awkward postures, particularly kneeling during aircraft inspections and component maintenance.
History
The veteran an Aircraft Technician in the RAAF, developed left knee patellofemoral osteoarthrosis due to the cumulative physical demands of his military service spanning over 30 years. The condition developed gradually over time as a result of repetitive kneeling, squatting, and climbing required for aircraft maintenance duties, with no specific acute onset documented.
Timeline
- 09 November 2018: The veteran underwent MRI scan of the left knee due to chronic pain, revealing moderate patellofemoral osteoarthrosis, predominantly involving the trochlear cartilage. The imaging showed mild central patellar chondral softening and mild central and medial trochlear chondral softening with a significant 2 x 1.4 cm area of superior medial trochlear intermediate grade to high-grade chondral loss with mild subchondral marrow edema and small subchondral cystic changes. Additionally, mild inferior lateral trochlear chondral softening was noted. A 2 x 1.3 cm area of medial femoral central and posterior weight-bearing mild chondral softening with subtle subchondral marrow edema was identified. Mild joint effusion and a tiny Baker's cyst were present, indicating chronic inflammation. The findings suggest degenerative changes from repetitive kneeling and squatting in aircraft maintenance over decades of service.
Symptoms
The veteran experiences chronic left knee pain exacerbated by prolonged kneeling, squatting, and climbing activities associated with his aircraft maintenance duties. Current symptoms include ongoing pain, stiffness, and functional limitation affecting his ability to perform occupational tasks requiring prolonged kneeling or squatting positions during aircraft maintenance work.
Imaging
09 November 2018: MRI left knee revealed moderate patellofemoral osteoarthrosis, predominantly involving the trochlear cartilage. Mild central patellar chondral softening and 2 x 1.4 cm superior medial trochlear intermediate grade to high-grade chondral loss with mild subchondral marrow edema and small subchondral cystic changes. 2 x 1.3 cm medial femoral central and posterior weight-bearing mild chondral softening with subtle subchondral marrow edema. Mild joint effusion and tiny Baker's cyst noted.
1. What is the formal diagnosis of the condition claimed above?
Left Knee Patellofemoral Osteoarthrosis: Degenerative joint disease affecting the patellofemoral compartment, characterized by progressive cartilage loss, subchondral bone changes, and synovial inflammation. DVA SOP: Osteoarthritis Instrument No. 63 & 64 of 2014. ICD-10 Code: M17.1. This condition involves the breakdown of articular cartilage between the patella and femoral trochlea, leading to pain, stiffness, and functional impairment. Osteoarthritis is a chronic degenerative joint disease characterized by progressive loss of articular cartilage, subchondral bone sclerosis, osteophyte formation, and synovial inflammation, resulting in pain, stiffness, and reduced joint function.
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 of chronic left knee pain related to this degenerative condition over the course of his military service, with the condition being formally identified through MRI imaging on 09 November 2018. No specific earlier documentation of left knee symptoms was found in the provided records.
When did the veteran first present to a health / medical provider for this condition?
The veteran first presented for medical assessment of this left knee condition leading to MRI evaluation on 09 November 2018, performed by I-MED Regional the base city.
When was the condition confirmed / formally diagnosed?
The condition was confirmed and formally diagnosed on 09 November 2018 through MRI imaging of the left knee, interpreted by the treating doctor, I-TELERAD Radiologist.
When did the veteran first present to you (or your practice) for this condition?
10 Apr 2018.
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 was confirmed through MRI imaging of the left knee performed on 09 November 2018. Key findings included moderate patellofemoral osteoarthrosis with chondral loss, cartilage softening and fissuring, subchondral marrow edema, and cystic changes predominantly affecting the trochlear cartilage. Joint effusion and Baker's cyst were present, consistent with chronic degenerative changes. The imaging was interpreted by the treating doctor, demonstrating clear evidence of osteoarthritic changes in the left knee patellofemoral compartment.
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.
Significant physical trauma to the joint: NOT MET - No specific traumatic injury to the left knee is documented in the medical records.
Joint or ligament injury: NOT MET - No acute joint or ligament injuries to the left knee are documented.
Biomechanical abnormality: NOT MET - No specific biomechanical abnormalities are documented in the medical records.
Inability to undertake weight bearing exercise for a continuous period of at least six weeks: NOT MET - No documented periods of inability to undertake weight bearing exercise.
Repetitive or sustained activities involving kneeling or frequent knee bending: MET - the veteran role as an Aircraft Technician required prolonged periods of kneeling, squatting, and climbing to access aircraft components during maintenance tasks. This repetitive stress over 30+ years of service directly contributed to the development of left knee patellofemoral osteoarthrosis through cumulative microtrauma to the knee joint.
Inability to obtain appropriate clinical management: MET - The condition remained undiagnosed until 2023 despite likely developing over many years of service, indicating barriers to appropriate clinical assessment and imaging that would have identified these degenerative changes earlier, resulting in progression of the osteoarthritic process.
Sequelae
This condition is not a sequelae of another known condition but developed as a primary degenerative process due to occupational stressors over decades of military service.
Unintended Consequence
This condition does not represent an unintended consequence of medical management, as it developed from occupational exposures rather than as a result of medical procedures or treatments.
Inability to Attain Appropriate Medical Management
The Full Federal Court in Brew v Repatriation Commission (06 May 1993) establishes that "inability" encompasses both objective and subjective barriers to obtaining treatment. The veteran left knee condition remained undiagnosed until 2023 despite likely developing over many years of service. The absence of earlier knee presentations or investigations indicates significant barriers to healthcare access, satisfying the inability to attain appropriate medical management factor. This delay in diagnosis allowed the osteoarthritic process to progress without intervention, resulting in permanent worsening of the condition through continued occupational stress on an undiagnosed degenerative joint.
The % contribution of the causes is 100% and significant.
5. Please provide a Health Summary and a medication / prescribing history.
-see attached report
