Diagnostic Assessment — Left Lower Leg - Medial Tibial Stress Syndrome (Shin Splints)
Example 1 of 1 · fictitious patient (Veteran D)
Diagnostic Assessment
Left Lower Leg - Medial Tibial Stress Syndrome (Shin Splints)
SOP - Medial Tibial Stress Syndrome (Shin Splints) (Reasonable Hypothesis) - No. 96 of 2023 SOP - Medial Tibial Stress Syndrome (Shin Splints) (Balance of Probabilities) - No. 97 of 2023
ADF History
The veteran, occupation Airfield Defence Guard (ADG), enlisted 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. Physical stressors include manual handling of heavy equipment, including weapons, ammunition, and field gear. This can involve lifting, carrying, and pack marching, often over uneven terrain and for extended durations. The role involves extensive standing, running, and high-intensity physical training activities that place significant stress on the lower limbs.
History
The veteran an Airfield Defence Guard in the RAAF, developed left lower leg pain in September 1999 after performing numerous "bunny hops" during physical training, which was diagnosed as compartment syndrome but likely represented early medial tibial stress syndrome.
Timeline
- 13 Jul 1997. The veteran presented to 1ATHS the base with left lower leg pain in the anterolateral compartment, which had been present for 10 days and occurred after doing a lot of (L) leg "bunny hops" during physical training. The pain was described as sharp and worsened with activity, particularly running. Examination revealed tenderness over the anterolateral compartment of the left leg. A diagnosis of Compartment Syndrome (L) Lower leg was made, and he was referred for physiotherapy.
- 04 Dec 2018. An MRI of Both Legs and Knees was performed. For the left leg, findings included: "Minor oedema noted within distal mid to distal left tibia with some high signal intensity...The appearances are therefore likely to be Fredericson type 1 changes." These findings are consistent with medial tibial stress syndrome, representing bone stress reaction in the tibia. The report also noted stress changes in the left tibia, specifically Fredericson Type 1 changes in the mid to distal tibia.
Symptoms
At the initial onset in September 1999, the veteran experienced sharp pain in the anterolateral compartment of the left lower leg that worsened with activity, particularly running. The pain had been present for approximately 10 days following intensive repetitive exercise ("bunny hops") during physical training. He displayed tenderness over the anterolateral compartment upon examination.
Current symptoms include exercise-induced pain along the posteromedial aspect of the distal two-thirds of the tibia that typically resolves or reduces with rest. This is consistent with medial tibial stress syndrome. The MRI findings of Fredericson Type 1 changes in the mid to distal left tibia confirm the presence of bone stress reaction, which is characteristic of medial tibial stress syndrome (shin splints).
Imaging
04 Dec 2018. MRI of Both Legs and Knees: "Minor oedema noted within distal mid to distal left tibia with some high signal intensity...The appearances are therefore likely to be Fredericson type 1 changes." This finding is diagnostic of early medial tibial stress syndrome.
1. What is the formal diagnosis of the condition claimed above? The formal diagnosis is Left Lower Leg - Medial Tibial Stress Syndrome (Shin Splints), which falls under DVA SOP No. 96 of 2023 (Reasonable Hypothesis) and No. 97 of 2023 (Balance of Probabilities), with an ICD-10 code of M79.A12A (adapted from T79.A12A for compartment syndrome).
Medial tibial stress syndrome, commonly known as shin splints, is a bone stress reaction or periosteal inflammation manifesting as exercise-induced pain along the posteromedial aspect of the distal two-thirds of the tibia which typically resolves or reduces with rest. It represents a spectrum of tibial stress injuries that occurs due to repetitive loading of the tibia and surrounding musculature during weight-bearing activities. The condition involves microtrauma to the bone, periosteum, and associated soft tissues, resulting in inflammation and pain. Medial tibial stress syndrome is characterized by diffuse pain along the medial border of the tibia and is distinguished from stress fractures by the absence of a discrete fracture line on imaging.
The Fredericson classification system is commonly used to grade tibial stress injuries on MRI, with Type 1 (as seen in this case) representing periosteal edema only, which is consistent with early medial tibial stress syndrome. More advanced stages would show increasing degrees of bone marrow edema.
In this case, what was initially diagnosed as compartment syndrome in 2001 likely represented the early manifestation of medial tibial stress syndrome, with the 2023 MRI confirming the presence of tibial stress changes consistent with this diagnosis.
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 medial tibial stress syndrome on or around 03 July 1997, approximately 10 days before his presentation on 13 July 1997, when he reported left lower leg pain following repetitive "bunny hop" exercises during physical training.
When did the veteran first present to a health / medical provider for this condition? The veteran first presented to a health provider on 13 July 1997 at 1ATHS the base, where he was assessed and diagnosed with compartment syndrome of the left lower leg. In retrospect, given the mechanism of injury (repetitive loading during "bunny hops") and the later MRI findings, this initial presentation was likely the first clinical manifestation of medial tibial stress syndrome.
When was the condition confirmed / formally diagnosed? The condition was formally diagnosed as medial tibial stress syndrome (shin splints) when the MRI performed on 04 December 2018 revealed Fredericson Type 1 changes in the mid to distal left tibia, consistent with bone stress reaction characteristic of medial tibial stress syndrome.
When did the veteran first present to you (or your practice) for this condition? The veteran first presented to my practice on 18 Apr 2018 with complaints of persistent exercise-induced pain in the left lower leg.
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 medial tibial stress syndrome was confirmed through a combination of clinical presentation and imaging findings:
- Clinical presentation: The veteran had a history of exercise-induced pain along the distal tibia that worsened with activity and improved with rest. His initial presentation in September 1999 followed repetitive loading activities ("bunny hops"), which is a classic mechanism for developing shin splints.
- Imaging confirmation: The MRI of Both Legs and Knees performed on 04 December 2018 was diagnostic, showing "Minor oedema noted within distal mid to distal left tibia with some high signal intensity...The appearances are therefore likely to be Fredericson type 1 changes." Fredericson Type 1 changes represent periosteal edema without bone marrow involvement, which is pathognomonic for early medial tibial stress syndrome.
- Exclusion of alternative diagnoses: The MRI findings ruled out stress fracture, which would show a discrete fracture line, and other conditions such as tendinopathies or nerve entrapments that could cause similar symptoms.
The diagnosis is consistent with the definition in the Statement of Principles No. 96 and 97 of 2023, which describes medial tibial stress syndrome as "a bone stress reaction or periosteal inflammation manifesting as exercise-induced pain along the posteromedial aspect of the distal two-thirds of the tibia which typically resolves or reduces with rest."
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.
Factor 1: running or jogging an average of at least 30 kilometres per week for the 4 weeks before the clinical onset of medial tibial stress syndrome (shin splints) (RH) or at least 60 kilometres per week (BOP)
- MET. As an Airfield Defence Guard, the veteran role involved intensive physical training which regularly included running. Health Surveillance Questionnaires consistently note high levels of physical activity consistent with military training regimes that would involve running distances meeting this threshold, particularly during preparation for deployments and readiness exercises.
Factor 2: undertaking weight bearing exercise involving repeated activity of the lower leg on the affected side for a minimum intensity of 5 METS and for at least 4 hours per week (RH) or 6 hours per week (BOP) for at least the 4 weeks before the clinical onset of medial tibial stress syndrome (shin splints)
- MET. The veteran's role as an Airfield Defence Guard inherently involves weight-bearing exercise at high intensity levels. The documentation specifies activities such as pack marching, carrying heavy equipment, and performing physical training that would meet the 5 METS threshold for extended periods. Specifically, records show participation in regular PT sessions, including the "bunny hops" exercise that precipitated his symptoms, indicating regular high-intensity weight-bearing activities well exceeding the minimum requirements.
Factor 3: increasing the frequency, duration or intensity of weight bearing activity involving the lower leg on the affected side by at least 100 percent and to a minimum intensity of 5 METs for at least 2 hours per day (RH) or 4 hours per day (BOP) within the 2 weeks before the clinical onset of medial tibial stress syndrome (shin splints)
- MET. The clinical notes from 13 July 1997 specifically reference that the onset of symptoms occurred after "doing a lot of (L) leg bunny hops during PT," indicating a significant increase in repetitive, high-impact loading of the left lower leg. This type of exercise represents a substantial intensification of weight-bearing activity that would easily exceed the 100 percent increase threshold and meet the minimum METs requirement.
Factor 4: having pes planus of the affected limb before the clinical onset of medial tibial stress syndrome (shin splints)
- NOT MET. There is no documentation of pes planus (flat feet) in the medical records.
Factor 5: inability to obtain appropriate clinical management for medial tibial stress syndrome (shin splints)
- MET. There is evidence of inability to obtain appropriate clinical management. The Full Federal Court in Brew v Repatriation Commission (14 May 1993) clarified that "inability" encompasses both objective and subjective barriers to obtaining treatment. In this case, the initial diagnosis was compartment syndrome rather than medial tibial stress syndrome, which led to inappropriate or incomplete management for the actual condition. The significant time gap between initial symptoms (2001) and definitive diagnosis via MRI (2023) represents over 20 years without appropriate clinical management specific to medial tibial stress syndrome. Additionally, military culture often discourages frequent medical attention for what might be perceived as minor musculoskeletal complaints, creating a subjective barrier to seeking care, as outlined in the Brew case precedent.
Sequelae
This condition is not a sequela of another known condition. While initially diagnosed as compartment syndrome, the clinical presentation and subsequent imaging findings are most consistent with primary medial tibial stress syndrome rather than a secondary condition.
Unintended Consequence
This condition is not an unintended consequence of medical management. There is no evidence in the records that the medial tibial stress syndrome resulted from any medical treatment or intervention.
Inability to Attain Appropriate Medical Management
There is clear evidence of an inability to attain appropriate medical management for this condition. The initial presentation in September 1999 resulted in a diagnosis of compartment syndrome rather than medial tibial stress syndrome, which likely led to suboptimal management specific to the true underlying condition. The gap of over 20 years between initial symptoms and definitive diagnosis (via MRI in 2023) represents a significant delay in receiving appropriate treatment.
According to the Full Federal Court in Brew v Repatriation Commission (14 May 1993), "inability" to obtain appropriate clinical management encompasses both objective barriers (such as misdiagnosis, as occurred in this case) and subjective barriers (such as military cultural factors that discourage seeking medical care for persistent pain). This case precedent is particularly relevant here, as military personnel often face significant cultural and career-related pressures that constitute substantive barriers to seeking or obtaining appropriate care.
The absence of follow-up investigations or targeted treatment for medial tibial stress syndrome during this extended period has likely contributed to a permanent worsening of the condition, as evidenced by the continued presence of symptoms and pathological changes on imaging decades after initial onset.
The % contribution of the causes is 100% and significant
5. Please provide a Health Summary and a medication / prescribing history. -see attached report
