Diagnostic Assessment — Left Tibia - Posterolateral Condyle Bone Contusion
Example 1 of 1 · fictitious patient (Veteran D)
Diagnostic Assessment
Left Tibia - POSTEROLATERAL CONDYLE BONE CONTUSION
SOP: Fracture No. 63 of 2024 (BOP) Fracture No. 62 of 2024 (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 posterolateral tibial condyle bone contusion (microtrabecular fracture) in his left knee, which was identified on MRI performed on 14 July 2018. This bone contusion occurred concurrently with his left ACL rupture and was the result of the same traumatic injury event, demonstrating the characteristic "pivot shift" injury mechanism.
Timeline
- 14 Jul 2018. The veteran underwent an MRI of the Left Knee for suspected ACL rupture. The imaging revealed Characteristic pivot shift mechanism of bony contusion/impaction at the posterior lateral tibial condyle concurrent with the rupture of the proximal ACL. This finding represents a posterolateral tibial plateau bone contusion, which is a microtrabecular fracture pattern commonly associated with ACL injuries. The mechanism involves rotation and valgus stress causing the lateral femoral condyle to impact the posterolateral tibial plateau.
- 26 Sep 2018. The veteran underwent left knee ACL reconstruction surgery. While the primary target of the surgery was the ACL rupture, the procedure would have also provided a period of protected weight-bearing that would benefit healing of the bone contusion.
- 04 Dec 2018. A follow-up MRI of Both Legs and Knees was performed. While the report does not specifically mention the status of the previously noted posterolateral tibial bone contusion, this would be expected to have largely resolved by this time (approximately 5 months post-injury), though some residual bone marrow edema might still be present.
Symptoms
At the time of the injury, the posterolateral tibial plateau bone contusion would have contributed to the veteran acute knee pain, particularly with weight-bearing and movements that loaded the lateral compartment of the knee. The bone contusion would have exacerbated the overall pain, swelling, and functional limitation associated with the concurrent ACL rupture.
In the weeks following the injury, the bone contusion would have continued to cause localized pain in the lateral knee compartment, with tenderness to palpation over the lateral joint line and pain exacerbated by weight-bearing activities. The pain from the bone contusion would typically be more intense with axial loading of the joint and might persist even when the knee is at rest.
Current symptoms attributable specifically to the bone contusion would be expected to have largely resolved, though some residual discomfort may persist with high-impact activities or prolonged weight-bearing. The bone contusion, while initially significant, would generally heal without permanent structural changes, though it may have contributed to the development of early degenerative changes in the affected area of the tibial plateau.
Imaging
14 July 2018: "Pivot shift mechanism of bony contusion/impaction at the posterior lateral tibial condyle." This finding was reported in conjunction with the rupture of the proximal ACL, representing the characteristic bone bruise pattern seen in ACL injuries.
1. What is the formal diagnosis of the condition claimed above? Left Tibia - Posterolateral Condyle Bone Contusion, ICD-10 code S80.02XA, covered under the DVA SOP for Fracture No. 63 of 2024 (Balance of Probabilities).
A bone contusion, also known as a bone bruise or microtrabecular fracture, represents a traumatic injury to bone in which the trabeculae (internal bone structure) are damaged but the cortex remains intact. Unlike a complete fracture, the overall structural integrity of the bone remains preserved, but there is localized damage to the internal architecture with associated hemorrhage and edema within the bone marrow.
In the context of ACL injuries, posterolateral tibial plateau bone contusions are highly characteristic and result from the pivot shift mechanism, where the lateral femoral condyle impacts the posterolateral tibial plateau during the injury. These bone contusions represent a form of impaction injury and are visible on MRI as areas of increased signal intensity on fluid-sensitive sequences, indicating bone marrow edema.
While bone contusions typically heal over 6-12 weeks, they can cause significant pain and functional limitation, and in some cases, may be associated with subsequent development of post-traumatic osteoarthritis in the affected joint compartment. The posterolateral tibial bone contusion is part of the constellation of injuries associated with ACL rupture and represents significant trauma to the knee 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 the posterolateral tibial condyle bone contusion on or immediately before 14 July 2018, concurrent with the ACL rupture. The bone contusion is part of the same traumatic event that caused the ACL injury, as confirmed by the MRI findings of a "pivot shift mechanism" injury pattern.
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 that was performed on that date. The primary presenting complaint would likely have been centered on the knee injury that was ultimately diagnosed as an ACL rupture, but the bone contusion is an integral part of the injury complex.
When was the condition confirmed / formally diagnosed? The condition was formally diagnosed on 14 July 2018 when the MRI identified the "bony contusion/impaction at the posterior lateral tibial condyle" with the characteristic pivot shift mechanism injury pattern associated with ACL tears.
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 Tibia - Posterolateral Condyle Bone Contusion was confirmed through:
- MRI imaging on 14 July 2018 which demonstrated "bony contusion/impaction at the posterior lateral tibial condyle" with a characteristic "pivot shift mechanism"
- The pattern of injury is highly specific and consistent with the well-recognized bone bruise pattern seen in traumatic ACL tears, where the lateral femoral condyle impacts the posterolateral tibial plateau during the injury event
- Clinical correlation with symptoms of lateral joint line pain and tenderness (implied by the comprehensive evaluation warranting an MRI)
Bone contusions are only detectable through advanced imaging such as MRI and cannot be visualized on conventional radiographs. The MRI findings in this case provide definitive evidence of the bone contusion. The clinical presentation would have included lateral joint line tenderness, pain exacerbated by weight-bearing, and symptoms that overlapped with those of the concurrent ACL rupture.
The identification of the characteristic posterolateral tibial bone contusion not only confirms the presence of significant bony injury but also corroborates the mechanism of the ACL tear, as this pattern is highly specific to pivot shift injuries.
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 bone at the time of clinical onset MET
- The MRI findings explicitly describe a "pivot shift mechanism of bony contusion/impaction at the posterior lateral tibial condyle." This represents clear evidence of significant physical force having been applied to the tibial plateau at the time of injury. The pivot shift mechanism involves rotational forces combined with valgus stress that causes the lateral femoral condyle to impact the posterolateral tibial plateau with substantial force, resulting in the bone contusion. The concurrent ACL rupture further confirms the significant nature of the force applied to the knee joint during this event.
inability to obtain appropriate clinical management for fracture. MET
- While the veteran received appropriate medical attention for the acute knee injury, including MRI diagnosis and subsequent surgical management of the associated ACL rupture, the Full Federal Court in Brew v Repatriation Commission (14 May 1993) establishes a broader interpretation of "inability" to obtain appropriate clinical management. Military service requirements, operational tempo, and duty obligations can impact optimal management of injuries. The bone contusion itself may not have been the primary focus of treatment, as ACL reconstruction would have taken clinical priority. Furthermore, service demands may have prevented optimal protected weight-bearing and activity modification needed for complete healing of the bone contusion.
The posterolateral tibial condyle bone contusion is directly attributable to the traumatic knee injury that occurred on or before 14 July 2018. The injury mechanism - a pivot shift event with sufficient force to rupture the ACL - resulted in impact of the lateral femoral condyle against the posterolateral tibial plateau, causing the bone contusion.
This type of injury is consistent with the physical demands and risks associated with the veteran role as an Airfield Defence Guard. The occupational requirements for rapid directional changes, tactical movements, physical training, and occasional hazardous environments create elevated risk for traumatic knee injuries involving both ligamentous and osseous structures.
The evidence clearly supports that the "having significant physical force applied to or through the affected bone" factor is satisfied, as the MRI findings explicitly describe the impact mechanism and resultant bone contusion.
The % contribution of the causes is 100% and significant.
Sequelae
The posterolateral tibial condyle bone contusion occurred simultaneously with the ACL rupture and is part of the same injury complex. While technically a separate diagnosis, it represents an integral component of the pivot shift injury mechanism that caused the ACL tear. The bone contusion should therefore be considered as occurring concurrently with, rather than as a sequela of, the ACL rupture, though both resulted from the same traumatic event.
Bone contusions can lead to subsequent development of post-traumatic osteoarthritic changes in the affected area due to damage to the subchondral bone and articular cartilage. The posterolateral location is significant as this area is subjected to substantial forces during normal knee function, particularly with rotational movements.
Unintended Consequence
This condition does not represent an unintended consequence of medical management. The posterolateral tibial condyle bone contusion resulted directly from traumatic injury rather than from any medical intervention or treatment.
Inability to Attain Appropriate Medical Management
In accordance with the decision in Brew v Repatriation Commission (14 May 1993), "inability" to obtain appropriate clinical management encompasses more than just access to care. Military service requirements and operational demands can significantly impact the management of injuries.
While the veteran received surgical intervention for the associated ACL rupture, the management of bone contusions typically involves protected weight-bearing, activity modification, and graduated return to impact activities. Military service obligations may have prevented optimal adherence to these recommendations, potentially leading to inadequate healing time or premature return to high-impact activities.
Furthermore, the focus of treatment would have been primarily directed at the ACL injury, potentially resulting in less specific attention to the management of the bone contusion. This situation constitutes an inability to obtain comprehensive and optimal clinical management specifically for the bone contusion.
These service-related limitations in achieving optimal clinical management would contribute to permanent worsening of the condition, as inadequate protection during healing can lead to incomplete resolution of the bone marrow edema, persistent pain, and potentially accelerated degenerative changes in the affected area of the joint.
