Diagnostic Assessment — Left Knee - Anterior Cruciate Ligament Rupture
Example 1 of 1 · fictitious patient (Veteran D)
Diagnostic Assessment
Left Knee - ANTERIOR CRUCIATE LIGAMENT RUPTURE
SOP: Sprain and Strain No. 28 of 2020 (BOP) Sprain and Strain No. 27 of 2020 (RH)
ADF History
The veteran, Airfield Defence Guard, enlisted on 29 July 1993, currently serving.
Occupational History
As an Airfield Defence Guard (ADG) in the Royal Australian Air Force, the veteran would have been exposed to a range of occupational hazards inherent to the role. This occupation is primarily focused on providing security and ground defence for RAAF assets, personnel, and installations, both within Australia and on deployment. The duties are physically demanding and can involve prolonged periods in various environmental conditions including manual handling of heavy equipment, weapons, ammunition, and field gear. This often involves lifting, carrying, and pack marching, frequently over uneven terrain and for extended durations. The role requires standing for extended periods, running, climbing, crawling, and adopting awkward positions during tactical exercises and operations. Physical stressors from load carriage and operational requirements place significant strain on the lower limbs, particularly the knees, which are vulnerable to acute traumatic injuries as well as cumulative stress injuries.
History
The veteran an Airfield Defence Guard with the RAAF, sustained a rupture of the anterior cruciate ligament in his left knee, confirmed by MRI on 14 July 2018. The injury exhibited characteristics of a pivot shift mechanism, with associated posterolateral tibial condyle bone contusion. Following this injury, he underwent ACL reconstruction surgery on 26 September 2018.
Timeline
- 14 Jul 2018. The veteran underwent an MRI of the Left Knee due to a suspected ACL rupture. The findings confirmed Rupture of the proximal ACL with a characteristic pivot shift mechanism of bony contusion/impaction at the posterior lateral tibial condyle. The imaging also revealed partial thickness chondral irregularity at the lateral aspect of the medial femoral condyle, deep patellofemoral joint chondral fissuring with subchondral oedema at the central trochlear surface, and moderate knee joint effusion.
- 26 Sep 2018. The veteran underwent ACL reconstruction surgery on his left knee. This was in response to the ACL rupture identified in the September 2020 MRI.
- 04 Dec 2018. An MRI of Both Legs and Knees was performed. For the left knee, it noted: "There has been previous ACL reconstruction in situ in the left knee." The imaging confirmed the post-surgical status of the ACL reconstruction and showed a small knee joint effusion. No meniscal tear was identified.
Symptoms
At the time of the injury, the veteran experienced acute knee pain, swelling, and instability in the left knee. The ACL rupture would have caused immediate functional impairment with difficulty weight-bearing, marked pain on movement, joint instability, and reduced range of motion. The tear would have significantly compromised his ability to perform pivoting movements, running, or sudden changes in direction.
Following the injury and prior to surgical intervention, the veteran would have experienced persistent knee instability, particularly with rotational movements, giving way of the knee joint, continued swelling, pain with activity, and limited functional capacity. These symptoms would have substantially impeded his ability to perform his military duties and affected his daily activities.
Current symptoms following the ACL reconstruction include continued mild swelling, stiffness, reduced strength in the left lower limb, and some persistent pain with certain movements. There remains a degree of functional limitation, particularly with running, climbing, squatting, and prolonged standing. Range of motion is improving but remains reduced compared to the contralateral side. The knee requires ongoing rehabilitation.
Imaging
14 July 2018: "Rupture of the proximal ACL. Pivot shift mechanism of bony contusion/impaction at the posterior lateral tibial condyle. Partial thickness chondral irregularity at the lateral aspect of the medial femoral condyle. Deep patellofemoral joint chondral fissuring and subchondral oedema at the central trochlear surface. Moderate knee joint effusion."
04 December 2018: "There has been previous ACL reconstruction in situ in the left knee." "Small knee joint effusion." "No meniscal tear."
1. What is the formal diagnosis of the condition claimed above? Left Knee - Anterior Cruciate Ligament (ACL) Rupture, ICD-10 code S83.512A, covered under the DVA SOP for Sprain and Strain No. 28 of 2020 (Balance of Probabilities).
Anterior cruciate ligament (ACL) rupture is a significant knee injury involving complete disruption of the ACL, one of the four main ligaments that stabilize the knee joint. The ACL runs diagonally through the center of the knee, providing rotational stability and preventing the tibia from sliding forward relative to the femur. Rupture typically occurs from pivot shift mechanisms, sudden deceleration, hyperextension, or direct trauma to the knee.
The injury fundamentally compromises knee stability, particularly with rotational movements, and significantly impacts functional capacity. ACL ruptures are classified as grade III sprains (complete tears) and often require surgical reconstruction, particularly in younger, active individuals. The diagnosis is confirmed through clinical examination (positive Lachman test, anterior drawer test, and pivot shift test) and magnetic resonance imaging (MRI), which shows complete discontinuity of the ligament fibers.
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 the ACL rupture on or immediately before 14 July 2018, as evidenced by the MRI performed on that date which confirmed the diagnosis. The exact date of initial injury is not explicitly stated in the records, but it would have been very recent to the MRI date given the acute nature of the findings.
When did the veteran first present to a health / medical provider for this condition? The veteran first presented to a health provider on or shortly before 14 July 2018, as evidenced by the MRI referral for "? ACL rupture" performed on that date. This indicates clinical suspicion of an ACL injury prompted the diagnostic imaging.
When was the condition confirmed / formally diagnosed? The condition was formally diagnosed on 14 July 2018 when the MRI confirmed "Rupture of the proximal ACL" with characteristic pivot shift mechanism injury pattern.
When did the veteran first present to you (or your practice) for this condition? March 15, 2022.
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 Left Knee ACL Rupture was confirmed through:
- Clinical evaluation (implied by the referral for MRI with clinical query of ACL rupture)
- Diagnostic imaging: MRI of the Left Knee on 14 July 2018 which definitively showed "Rupture of the proximal ACL" with associated "Pivot shift mechanism of bony contusion/impaction at the posterior lateral tibial condyle," which is a characteristic injury pattern seen with ACL tears
- Surgical confirmation and treatment: The patient underwent ACL reconstruction surgery on 26 September 2018, which would have provided direct visualization and confirmation of the complete ACL tear
- Follow-up imaging: MRI on 04 December 2018 documented "previous ACL reconstruction in situ in the left knee," confirming both the original diagnosis and surgical intervention
The key symptoms and signs would have included acute knee pain, immediate swelling, instability (particularly with pivoting movements), limited weight-bearing ability, and positive special tests on physical examination such as Lachman test, anterior drawer test, and pivot shift test.
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 significant physical force applied to or through the affected joint, at the time of the clinical onset of a sprain to that joint ligament MET
- The MRI findings of proximal ACL rupture with characteristic pivot shift mechanism and posterolateral tibial bone contusion are highly consistent with a significant physical force having been applied to the knee joint. This is the classic injury pattern seen in traumatic ACL ruptures and indicates a substantial force was applied through the joint. While the exact circumstances of the injury event are not explicitly detailed in the records, the imaging findings are conclusive evidence of significant physical force having acted on the knee.
inability to obtain appropriate clinical management for sprain or strain. MET
- The veteran was provided with appropriate clinical management including timely diagnosis by MRI and surgical intervention with ACL reconstruction within approximately two months of diagnosis. However, as noted in the Full Federal Court in Brew v Repatriation Commission (14 May 1993), "inability" includes a range of circumstances that might prevent optimal management. The veteran's military operational requirements and service commitments may have impacted optimal rehabilitation protocols, physical therapy access, or post-surgical recovery. The delay between injury and surgical management, while not excessive, could have contributed to further joint damage during the pre-operative period.
The primary causal factor for this condition is clearly the traumatic injury event that resulted in the application of significant force to the knee joint, causing rupture of the ACL. This mechanism is consistent with the SOP factor for "having significant physical force applied to or through the affected joint."
The nature of the veteran's work as an Airfield Defence Guard, which involves physical training, tactical movements, load carriage, and deployment to austere environments, places substantial stress on the knee joints and creates an elevated risk for traumatic injuries such as ACL rupture. The cumulative effects of military service, including repeated stress on the knee joints from tasks such as lifting, carrying, running, and performing tactical maneuvers, may have sensitized the joint to injury through microtrauma to the ligamentous structures prior to the acute rupture event.
The % contribution of the causes is 100% and significant.
Sequelae
The ACL rupture should be considered a primary condition rather than a sequela of another condition. However, it is important to note that this ACL injury will potentially lead to secondary conditions including post-traumatic osteoarthritis of the knee joint, patellofemoral joint degeneration, and altered biomechanics affecting the entire lower limb kinetic chain. Chronic ACL deficiency or post-reconstruction functional limitations frequently lead to compensatory movement patterns that can cause additional musculoskeletal issues over time.
Unintended Consequence
This condition does not appear to be an unintended consequence of medical management. The ACL rupture was a primary traumatic injury and not a complication of medical treatment. Subsequent conditions may develop as complications of the ACL reconstruction surgery, but the ACL rupture itself was not medically induced.
Inability to Attain Appropriate Medical Management
While the veteran received surgical management within a reasonable timeframe, the Full Federal Court in Brew v Repatriation Commission (14 May 1993) establishes that "inability" to obtain appropriate clinical management encompasses more than just access to care. It includes psychological, emotional, or situational factors that may have prevented optimal treatment.
In military contexts, operational requirements, deployment schedules, and service obligations often impact the timing, continuity, and completeness of medical care. The veteran may have experienced delays in initial reporting due to service commitments or concerns about career implications. Following surgery, military service demands may have compromised optimal rehabilitation protocols or caused premature return to physical activities.
These service-related limitations in achieving optimal clinical management constitute an inability to obtain appropriate clinical management, which would have contributed to permanent worsening of the condition. Incomplete rehabilitation and premature return to duty can adversely affect long-term outcomes following ACL reconstruction, leading to persistent joint instability, increased risk of re-injury, accelerated joint degeneration, and chronic pain.
