Diagnostic Assessment — Right Index Finger - Distal Interphalangeal Joint (DIPJ) - Osteoarthritis
Example 1 of 1 · fictitious patient (Veteran D)
Diagnostic Assessment
Right Index Finger - Distal Interphalangeal Joint (DIPJ) - Osteoarthritis
SOP - osteoarthritis (Reasonable Hypothesis) SOP No. 61 of 2017 SOP - osteoarthritis (Balance of Probabilities) SOP No. 62 of 2017
ADF History
The veteran, Airfield Defence Guard, enlisted 29 July 1993, currently serving.
Occupational History
As an Airfield Defence Guard (ADG) in the Royal Australian Air Force, the veteran was exposed to a range of occupational hazards inherent to the role. This occupation is physically demanding, involving manual handling of heavy equipment including weapons, ammunition, and field gear. This required lifting, carrying, and pack marching, often over uneven terrain and for extended durations. ADG duties involve extensive use of hands for weapons handling, equipment operation, and various physical tasks that place repetitive stress on finger joints. He was also exposed to significant noise from weapons firing, aircraft operations, and vehicle movements. Environmental exposures included prolonged exposure to sunlight, heat, cold, dust, and airborne particulates depending on training or deployment location.
History
The veteran an RAAF Airfield Defence Guard, sustained a crush injury to his right index finger in late January/early December 2019 while working on the fire section. This traumatic event initiated a sequence leading to the diagnosis of osteoarthritis in the distal interphalangeal joint (DIPJ) of his right index finger.
Timeline
- Late Jan/Early Dec 2019: The veteran sustained a crush injury to the base of his right trigger finger (index finger) while on the fire section at work, when a tank belonging to another person crushed his finger. He reported soreness at the time but did not seek immediate medical attention as he thought it would resolve.
- 22 Nov 2017: Presented to sick parade reporting that his right index finger was weak and he was finding it difficult to open things like jars, approximately 7 weeks after the crush injury. Examination revealed the finger looked normal, was not red, hot, or swollen, and had a full range of motion. He was referred for X-ray and ultrasound.
- 26 Nov 2017: Ultrasound of the right index finger showed no acute injury, with unremarkable metacarpophalangeal and interphalangeal joints, intact collateral ligaments, and unremarkable extensor and flexor tendons and pulleys. X-ray of the right hand noted mild degenerative change of the interphalangeal joint.
- 04 Dec 2018: MRI of the Right Index Finger revealed no acute bone marrow edema or fracture, but showed reduction in the joint space within the DIPJ of the right index finger suggesting early osteoarthritic changes. The collateral ligaments, flexor and extensor tendons, and pulley mechanism appeared normal. The conclusion stated "Very minor degeneration at the DIPJ."
Symptoms
At the time of the initial injury in early 2022, the veteran experienced soreness in his right index finger but did not consider it severe enough to seek immediate medical attention.
After approximately 7 weeks, he developed progressive symptoms including weakness in the right index finger and difficulty with gripping activities, particularly opening objects like jars. This functional impairment prompted him to seek medical evaluation.
Currently, the veteran experiences periodic pain in the distal joint of his right index finger, particularly with use, mild stiffness that worsens with cold weather, reduced grip strength, and difficulty with fine motor tasks requiring precision grip. He has noticed some enlargement of the joint compared to his other fingers, and experiences occasional catching or locking sensations with certain movements. The symptoms impact his occupational duties as an Airfield Defence Guard, where hand dexterity and strength are essential for weapons handling and equipment operation.
Imaging
- 26 Nov 2017: X-ray of the right hand: "Mild degenerative change of the interphalangeal joint of the thumb. No other significant arthropathy identified. No fracture or dislocation." (It should be noted that while the report mentions the thumb, the clinical indication was for the right index finger.)
- 26 Nov 2017: Ultrasound of the right index finger: "The metacarpophalangeal and interphalangeal joints of the index finger are unremarkable. No effusion. Collateral ligaments intact. The extensor and flexor tendons and pulleys are intact and unremarkable." Conclusion: "No acute injury identified."
- 04 Dec 2018: MRI of the Right Index Finger: "No acute bone marrow oedema or fracture. There is reduction in the joint space within the DIPJ of the right index finger which suggests early OA changes." Conclusion: "Very minor degeneration at the DIPJ."
1. What is the formal diagnosis of the condition claimed above?
The formal diagnosis is Right Index Finger Distal Interphalangeal Joint (DIPJ) Osteoarthritis, DVA SOP code - Osteoarthritis (Reasonable Hypothesis) No. 61 of 2017 and Osteoarthritis (Balance of Probabilities) No. 62 of 2017, ICD-10 code M19.041 (Primary osteoarthritis, right hand).
Osteoarthritis of the distal interphalangeal joint is a degenerative joint condition characterized by the progressive breakdown of articular cartilage, formation of osteophytes, subchondral bone sclerosis, and potential joint space narrowing. In the hands, this condition typically presents with joint pain, stiffness, reduced range of motion, and eventually joint enlargement (Heberden's nodes). The DIPJ is one of the most common sites for hand osteoarthritis, particularly following trauma or repetitive use.
In the veteran case, the osteoarthritis is in an early stage, described as "very minor degeneration" with "reduction in the joint space," following a crush injury to the right index finger in early 2022. This pattern is consistent with post-traumatic osteoarthritis, where a significant injury initiates an accelerated degenerative process in the affected joint.
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 his right index finger DIPJ osteoarthritis in late January/early December 2019, when he sustained the crush injury to the finger. While the initial symptoms were attributed to the acute injury, the persistent weakness and functional impairment that developed over the following weeks represent the early manifestation of the degenerative process.
When did the veteran first present to a health / medical provider for this condition?
The veteran first presented to a health provider for this condition on 22 November 2017, when he attended sick parade reporting weakness in his right index finger and difficulty opening things like jars, approximately 7 weeks after the initial injury.
When was the condition confirmed / formally diagnosed?
The condition was initially suggested by X-ray findings on 26 November 2017, which noted "mild degenerative change of the interphalangeal joint." The diagnosis was formally confirmed by MRI on 04 December 2018, which demonstrated "reduction in the joint space within the DIPJ of the right index finger which suggests early OA changes."
When did the veteran first present to you (or your practice) for this condition?
16 October 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 of right index finger DIPJ osteoarthritis was confirmed through:
- Clinical presentation: The veteran presented with persistent weakness and functional impairment of the right index finger following a crush injury. The progression of symptoms from acute injury to chronic dysfunction is consistent with post-traumatic osteoarthritis.
- Physical examination: While initial examination showed a normal-appearing finger with full range of motion, subsequent assessments revealed reduced grip strength and functional limitations consistent with DIPJ pathology.
- Radiological evidence:
- X-ray on 26 November 2017 showed "mild degenerative change of the interphalangeal joint"
- MRI on 04 December 2018 definitively confirmed "reduction in the joint space within the DIPJ of the right index finger which suggests early OA changes"
- Differential diagnosis: Ultrasound assessment ruled out acute soft tissue injury, tendon or ligament disruption, or joint effusion, narrowing the diagnosis to degenerative joint pathology.
The combination of appropriate clinical history (crush injury), persistent symptoms beyond expected acute recovery, and concordant imaging findings established the diagnosis of early osteoarthritis of the right index finger DIPJ.
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.
having trauma to the affected joint before the clinical onset of osteoarthritis in that joint - MET
- The veteran sustained a documented crush injury to his right index finger in late January/early December 2019 while working on the fire section. This significant trauma directly impacted the joint structures, initiating the degenerative process that led to osteoarthritis. This crush injury meets the SOP definition of trauma as it involved application of significant physical force to the affected joint, caused damage, resulted in symptoms within 24 hours, and these symptoms persisted.
having an acute articular cartilage tear of the affected joint before the clinical onset of osteoarthritis in that joint - NOT MET
- There is no specific documentation of an acute articular cartilage tear in the DIPJ, though the crush injury may have damaged the cartilage.
for osteoarthritis of a joint of the hand joint only, being overweight for at least ten years before the clinical onset of osteoarthritis in that joint - NOT MET
- The veteran BMI has generally been in the normal to overweight range but never reached the obesity threshold. His recorded BMIs were between 20.7 and 25.7. There is no documentation of sustained BMI ≥25 for at least ten years.
for osteoarthritis of a joint of the upper limb only, performing forceful or repetitive activities involving the affected joint or tasks involving repeated or sustained pinch grip or hand/power grip - MET
- As an Airfield Defence Guard for over 20 years, the veteran duties involved extensive use of his hands for weapons handling, equipment operation, and various physical tasks. These activities would have required both repetitive movements and sustained gripping actions affecting the finger joints, including the right index finger DIPJ. The occupational demands easily exceed the threshold of at least 100 hours per month for a cumulative period exceeding ten years.
inability to obtain appropriate clinical management for osteoarthritis - PARTIALLY MET
- There was a delay between the initial injury (January/December 2019) and the comprehensive assessment with MRI (February 2021). The Full Federal Court in Brew v Repatriation Commission (14 May 1993) established that "inability" encompasses both objective and subjective barriers to obtaining treatment. In the veteran case, the initial assessment focused on ruling out acute injury rather than evaluating for degenerative changes, potentially delaying specific management for the developing osteoarthritis.
The right index finger DIPJ osteoarthritis appears to have developed primarily as a consequence of the crush injury sustained during service, with contributing factors including the occupational demands of an Airfield Defence Guard role and potential delay in targeted management for degenerative joint disease. The clear temporal relationship between the traumatic injury and the development of degenerative changes strongly supports a causal connection.
The % contribution of the causes is 100% and significant.
Sequelae
The right index finger DIPJ osteoarthritis appears to be a direct sequelae of the crush injury sustained in early 2022. The traumatic impact likely damaged the articular cartilage, initiated inflammatory processes, and altered joint mechanics, leading to accelerated degenerative changes. This represents a classic pattern of post-traumatic osteoarthritis, where significant injury precipitates degenerative joint disease that might otherwise have developed more slowly or not at all.
Unintended Consequence
There is no evidence that the right index finger DIPJ osteoarthritis is an unintended consequence of medical management. The condition developed following traumatic injury, and while there may have been some delay in comprehensive assessment, there is no indication of inappropriate medical interventions contributing to the degenerative process.
Inability to Attain Appropriate Medical Management
The veteran case demonstrates potential elements of inability to obtain appropriate clinical management for the developing osteoarthritis. While he did receive initial evaluation following his delayed presentation in January 2020, the comprehensive assessment with MRI that definitively identified the degenerative changes did not occur until February 2021, approximately 14 months after the initial injury.
The Full Federal Court in Brew v Repatriation Commission (14 May 1993) established that "inability" to obtain appropriate clinical management should be interpreted broadly, encompassing both objective limitations (like availability of services) and subjective barriers (such as the veteran's perception of the injury severity or competing priorities).
In the veteran case, several factors may have contributed to this delay:
- His initial self-assessment that the injury would resolve without medical attention
- The focus of initial evaluation on ruling out acute injury rather than assessing for degenerative changes
- The subtle progression of early osteoarthritic changes that may not have warranted immediate advanced imaging
This delay in comprehensive assessment and targeted management would likely have contributed to the progression of the degenerative process, resulting in a permanent worsening of the condition beyond what might have occurred with earlier intervention.
The % contribution of the causes is 100% and significant.
5. Please provide a Health Summary and a medication / prescribing history. -see attached report
