Diagnostic Assessment — Right Tibia - Microtrabecular Fracture Posterolateral Condyle
Example 1 of 1 · fictitious patient (Veteran D)
Diagnostic Assessment
Right Tibia - Microtrabecular Fracture Posterolateral Condyle
Balance of Probabilities: Statement of Principles concerning fracture (Balance of Probabilities) (No. 63 of 2024) Reasonable Hypothesis: Statement of Principles concerning fracture (Reasonable Hypothesis) (No. 62 of 2024)
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 significant physical stressors including manual handling of heavy equipment, weapons, ammunition, and field gear. His duties involved lifting, carrying, and pack marching, often over uneven terrain and for extended periods. His role required physical training, fieldcraft, and participation in exercises and operational activities which placed repetitive stress on the musculoskeletal system, particularly the lower limbs. Health Surveillance Questionnaires consistently document exposure to physical demands and note his involvement in weapons range activities and proximity to flight lines. The veteran's occupation required frequent load-bearing activities, impact forces during training, and repetitive stress on the knee joints and surrounding structures, including the tibial plateau.
History
The veteran the veteran an Airfield Defence Guard in the RAAF, sustained a microtrabecular fracture of the posterolateral tibial condyle on 06 July 1999 while playing touch football as part of a service sporting activity. This occurred simultaneously with an ACL rupture in a traumatic twisting injury to the right knee.
Timeline
- 06 Jul 1999. The veteran was playing touch football as part of a service sporting activity when he sustained a significant injury to his right knee. He reported hearing a loud crunch and pop with immediate pain and swelling, requiring him to be carried from the field. An MRI performed that day confirmed a ruptured anterior cruciate ligament and microtrabecular fracturing of the posterolateral tibial condyle. This represents the acute traumatic injury resulting in the tibial fracture.
- 24 Jul 1999. The veteran underwent a right knee ACL reconstruction performed by the treating doctor. During the procedure, a small tear on the inner one third of the posterior horn of the lateral meniscus was debrided. The operation report did not specifically mention treatment of the microtrabecular fracture, suggesting it was managed conservatively as part of the overall treatment plan.
- 02 Jan 2000. A follow-up MRI of the right knee showed the ACL repair was intact. The report did not specifically mention the previous microtrabecular fracture, suggesting it had healed or was no longer a significant finding approximately 6 months post-injury.
- 04 Dec 2018. A comprehensive MRI of both legs and knees was performed. The report described previous ACL reconstruction in the right knee and various degenerative changes but did not specifically mention any ongoing issues related to the previous microtrabecular fracture, indicating complete healing of the fracture had occurred.
Symptoms
At the time of injury in September 2001, the veteran experienced acute pain, immediate swelling, and inability to bear weight on the right leg. The microtrabecular fracture contributed to these symptoms alongside the concurrent ACL rupture. The patient required assistance to be carried from the field, demonstrating significant functional impairment.
Following the initial acute phase, the symptoms attributable specifically to the microtrabecular fracture would have included pain localized to the lateral aspect of the knee/proximal tibia, tenderness to palpation over the posterolateral tibial condyle, and pain with weight-bearing activities. These symptoms would have gradually improved over the weeks following the injury as the fracture healed.
Current symptoms related to this condition are minimal to none, as the microtrabecular fracture has healed completely. Any current knee symptoms are more likely related to the subsequent ACL graft complications and early osteoarthritic changes rather than the acute fracture from 2003.
Imaging
- 06 Jul 1999: MRI Right Knee: "Rupture of the anterior cruciate ligament and microtrabecular fracturing of the posterolateral tibial condyle. Partial tearing of the posterior fibres of the medial retinaculum, however the medial collateral ligament appears intact. Subtle increase in signal intensity in the posterior horn of the medial meniscus, no discrete meniscal tear or flap identified. Lateral meniscus appears intact."
- 02 Jan 2000: MRI Right Knee: "Anterior cruciate ligament repair is intact. Focal truncation and blunting of the articular margin of the body of the lateral meniscus (?treated marginal radial tear). Early stellate signal change within the posterior horn of the medial meniscus, fine hyperintense line extends towards superior articular surface, suggestive of possible early tearing, no discrete flap." (Note: No specific mention of the previous microtrabecular fracture, suggesting healing had occurred)
1. What is the formal diagnosis of the condition claimed above?
The formal diagnosis is Right Tibia - Microtrabecular Fracture Posterolateral Condyle, ICD-10 code S82.151A (Fracture of lateral tibial plateau, right tibia, initial encounter for closed fracture).
A microtrabecular fracture is a type of bone injury characterized by microscopic disruption of the trabecular bone structure without a complete cortical break. It represents a pattern of injury that is more subtle than a gross fracture but still involves structural damage to the bone. In the tibial plateau, these fractures often occur due to compressive and shearing forces, such as those experienced during twisting injuries to the knee.
The posterolateral tibial condyle (lateral tibial plateau) is particularly vulnerable to this type of injury during pivoting motions that place rotational stress on the knee joint, especially when combined with valgus forces. The fracture often occurs in conjunction with soft tissue injuries, such as ACL tears, due to the biomechanics of the injury mechanism.
Microtrabecular fractures are detectable on MRI as areas of bone marrow edema or microfracture lines, even when not visible on plain radiographs. They represent a significant injury that requires proper management to prevent progression to more severe fractures or chronic pain and instability.
In the veteran case, the microtrabecular fracture of the posterolateral tibial condyle occurred simultaneously with an ACL rupture during a sports-related twisting injury. The fracture was identified on the initial MRI performed on the day of injury (November 3, 2003). Subsequent imaging in February 2002 did not specifically mention the fracture, suggesting healing had occurred by that time.
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 microtrabecular fracture of the posterolateral tibial condyle on November 3, 2003, when he sustained the acute injury while playing touch football as part of a service sporting activity. The symptoms began immediately upon injury, with reports of hearing a loud crunch and pop, experiencing immediate pain and swelling, and requiring assistance to be carried from the field.
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 November 3, 2003, the same day as the injury occurred. This prompt presentation resulted in an MRI being performed that same day, which confirmed the microtrabecular fracture of the posterolateral tibial condyle alongside the ACL rupture.
When was the condition confirmed / formally diagnosed?
The condition was confirmed and formally diagnosed on November 3, 2003, based on the MRI findings that explicitly documented "microtrabecular fracturing of the posterolateral tibial condyle." This immediate imaging and diagnosis allowed for appropriate management planning alongside treatment for the concurrent ACL injury.
When did the veteran first present to you (or your practice) for this condition?
January 20, 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 Right Tibia - Microtrabecular Fracture Posterolateral Condyle was confirmed through:
- Clinical presentation and history of an acute twisting injury to the right knee during a service sporting activity, with immediate pain, swelling, and functional impairment severe enough to require the veteran to be carried from the field.
- Physical examination findings consistent with acute knee trauma, likely including point tenderness over the posterolateral aspect of the knee/proximal tibia.
- Definitive confirmation via MRI imaging on November 3, 2003, which specifically documented "microtrabecular fracturing of the posterolateral tibial condyle" alongside an ACL rupture. This diagnostic imaging provided the anatomical evidence of the fracture.
The combination of appropriate mechanism of injury, clinical presentation, and MRI confirmation established the diagnosis of microtrabecular fracture of the posterolateral tibial condyle as a component of the acute knee trauma sustained during the service sporting activity.
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 veteran sustained a significant twisting injury to the right knee on November 3, 2003, while playing touch football as part of a service sporting activity. The mechanism of injury involved substantial rotational and compressive forces applied through the tibia during the pivoting motion, resulting in the microtrabecular fracture of the posterolateral tibial condyle. The severity of the applied force is evidenced by the concurrent ACL rupture and the immediate functional impairment that required the veteran to be carried from the field. This represents a clear application of significant physical force to and through the affected bone at the time of clinical onset.
for stress fracture only, having significant repetitive loading stress to the affected bone prior to clinical onset
- NOT MET. This factor is not applicable as the injury was an acute microtrabecular fracture resulting from a single traumatic event rather than a stress fracture developing from repetitive loading over time.
for stress fracture only, having significant chronic repetitive loading stress to the affected bone due to abnormal force intensity or direction of application, at the time of clinical onset
- NOT MET. This factor is not applicable as the condition was not a stress fracture but rather an acute microtrabecular fracture from direct trauma.
smoking at least 5 cigarettes per day, or the equivalent thereof in other tobacco products, during treatment for fracture prior to fracture non-union
- NOT MET. There is no evidence in the medical records that the veteran was a smoker. Multiple health assessments throughout his service consistently document that he never smoked. Additionally, there is no evidence of fracture non-union in this case.
having diabetes mellitus at the time of the fracture non-union
- NOT MET. There is no evidence in the medical records that the veteran had diabetes mellitus. Additionally, there is no evidence of fracture non-union in this case.
inability to obtain appropriate clinical management for fracture before clinical worsening
- NOT MET. The veteran received prompt diagnosis and appropriate management for his injury. An MRI was performed on the day of injury, and he underwent surgical treatment for the associated ACL rupture within three weeks. While the microtrabecular fracture itself was managed conservatively rather than surgically, this appears to have been appropriate clinical management as subsequent imaging suggested healing had occurred. There is no evidence of clinical worsening of the fracture due to inability to obtain appropriate management.
The % contribution of the causes is 100% and significant.
Sequelae
The microtrabecular fracture should not be considered a sequela of another condition. Rather, it represents a primary injury that occurred simultaneously with the ACL rupture during the acute traumatic event on November 3, 2003. Both injuries resulted directly from the significant physical forces applied to the knee joint during the twisting injury while playing touch football.
Unintended Consequence
The microtrabecular fracture was not an unintended consequence of medical management, as it occurred prior to any medical intervention. It was a direct result of the traumatic injury sustained during a service sporting activity rather than a complication of treatment. Therefore, section 6A of the SRCA regarding unintended consequences of medical treatment does not apply to this specific condition.
Inability to Attain Appropriate Medical Management
There is no evidence of an inability to attain appropriate medical management for the microtrabecular fracture. The veteran received prompt diagnosis through immediate MRI on the day of injury and appropriate management thereafter. The fracture appears to have healed without complications, as evidenced by the absence of specific mention in follow-up imaging.
Following the precedent established in Brew v Repatriation Commission (14 May 1993), there are no objective or subjective factors indicating inability to obtain appropriate management for this specific injury. The veteran had access to and received timely diagnostic imaging, surgical management of the associated ACL injury, and appropriate follow-up care that resulted in healing of the fracture without evident complications.
the % contribution of the causes is 100% and significant
5. Please provide a Health Summary and a medication / prescribing history. -see attached report
