Left Knee - Rectus Femoris Strain — DVA claim example (Diagnostic Assessment)

Example document — fictitious patient. Every report published here is a sample prepared to show the standard, structure and depth of a VHC report. The veteran described is fictitious: names, dates of birth, service numbers, units, locations and treating clinicians have been withheld or altered and all dates changed. It must not be relied upon as a record of any real claim.

Diagnostic Assessment — Left Knee - Rectus Femoris Strain

Example 1 of 1 · fictitious patient (Veteran D)

Example document — fictitious patient. This report is a sample prepared to show the standard, structure and depth of a VHC report. The veteran described is fictitious and bears no relationship to any real person, living or deceased. Names, dates of birth, contact details, service numbers, units, locations and treating clinicians have been withheld or altered and all dates have been changed. It must not be relied upon as a record of any real claim.

Diagnostic Assessment

Left Knee - RECTUS FEMORIS STRAIN

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. These activities place significant stress on the quadriceps muscle group, including the rectus femoris, through repetitive forceful contractions during activities such as lifting, climbing, squatting, and running. The rectus femoris is particularly vulnerable to strain injuries due to its biarticular nature (crossing both the hip and knee joints), which creates complex loading patterns during activities requiring simultaneous hip flexion and knee extension, common in military movement patterns.

History

The veteran an Airfield Defence Guard with the RAAF, developed a Grade 1 strain of the rectus femoris muscle at its distal insertion, which was identified on MRI performed on 04 December 2018. This muscle injury was noted in the context of post-ACL reconstruction rehabilitation and was found concurrently with other musculotendinous injuries affecting the quadriceps mechanism.

Timeline

26 Sep 2018. The veteran underwent ACL reconstruction surgery on his left knee. Following this procedure, he would have undergone rehabilitation including progressive strengthening of the quadriceps muscles, which can sometimes lead to excessive strain on the quadriceps components, particularly in the context of altered biomechanics and compensatory movement patterns.
04 Dec 2018. An MRI of Both Legs and Knees was performed, which revealed "Rectus femoris also has a distal insertional high signal intensity...suggestive of grade 1 tear." This finding indicates a mild (Grade 1) strain injury to the rectus femoris muscle at its distal insertion, characterized by microscopic tearing of muscle fibers with associated edema but without significant disruption of the muscle architecture.

Symptoms

At the time of diagnosis, the veteran would have experienced localized pain in the anterior thigh corresponding to the distal insertion of the rectus femoris muscle. This pain would typically be exacerbated by activities that simultaneously engage hip flexion and knee extension, such as kicking motions, high stepping, or rising from a seated position.

Additional symptoms would likely have included mild tenderness to palpation directly over the affected area of the rectus femoris insertion, possible minor swelling or tightness in the muscle, and pain with resisted combined hip flexion and knee extension. Given the Grade 1 classification of the strain, there would be minimal to no appreciable strength deficits or functional limitations specifically attributable to this mild injury.

As the condition was diagnosed in the context of post-ACL reconstruction rehabilitation and concurrent with other more significant quadriceps pathology, the specific symptoms related to the rectus femoris strain may have been somewhat obscured by the overall quadriceps dysfunction and knee symptoms.

Current symptoms would include mild residual discomfort with specific loading of the rectus femoris, particularly during activities requiring simultaneous hip flexion and knee extension, occasional tightness or cramping sensation with sustained or intense activity, and possibly some functional limitations during activities requiring explosive power through the anterior thigh. However, given the mild nature of the Grade 1 strain, symptoms would be expected to resolve relatively quickly with appropriate management.

Imaging

04 December 2018: "Rectus femoris also has a distal insertional high signal intensity...suggestive of grade 1 tear." This MRI finding indicates a mild (Grade 1) muscle strain of the rectus femoris at its distal insertion, characterized by increased signal intensity representing edema and microscopic fiber disruption.

1. What is the formal diagnosis of the condition claimed above? Left Knee - Rectus Femoris Strain (Grade 1, distal insertion), ICD-10 code S76.112A, covered under the DVA SOP for Sprain and Strain No. 28 of 2020 (Balance of Probabilities).

A muscle strain represents an injury to a muscle resulting from overstretching or excessive contraction. Grade 1 strains, as identified in the veteran case, involve microscopic tearing of muscle fibers with minimal functional impairment.

The rectus femoris is one of the four quadriceps muscles and is unique in being biarticular, meaning it crosses and acts upon two joints - the hip and the knee. It originates from the anterior inferior iliac spine and inserts into the patella as part of the quadriceps tendon. The muscle functions as both a hip flexor and knee extensor, making it vulnerable to strain injuries during activities that simultaneously engage both actions.

The distal insertion refers to the muscle-tendon junction where the rectus femoris joins the quadriceps tendon near the patella. This area experiences significant stress during activities requiring forceful knee extension, particularly when combined with hip flexion.

Grade 1 muscle strains are characterized by:

Microscopic disruption of muscle fibers
Localized edema and inflammation
Minimal loss of strength or function
Pain with specific loading of the affected muscle
Full healing potential with appropriate management

The condition represents an acute/subacute injury to the rectus femoris muscle at its distal insertion, likely occurring during the rehabilitation process following ACL reconstruction, where altered biomechanics and compensatory movement patterns can create abnormal loading of specific muscle components.

2. For each diagnosis identified, please also provide the following dates: When did the veteran first experience symptoms attributable to this condition? The exact date when the veteran first experienced symptoms specifically attributable to the rectus femoris strain is not precisely documented in the available records. The Grade 1 strain was identified on MRI on 04 December 2018. Given the mild nature of a Grade 1 muscle strain and the acute/subacute presentation on imaging, it is reasonable to infer that symptoms developed in the weeks prior to the MRI, likely in mid to late January 2021, during the rehabilitation period following his ACL reconstruction surgery on 26 September 2018.

Muscle strains typically develop acutely with a specific inciting event, though mild Grade 1 strains may sometimes develop more gradually with repetitive overuse. The MRI findings of "high signal intensity" at the distal insertion suggest a relatively recent injury, within days to a few weeks of the imaging study.

When did the veteran first present to a health / medical provider for this condition? Based on the available information, the veteran likely presented with symptoms leading to the MRI investigation shortly before 04 December 2018. The MRI study of "Both Legs and Knees" suggests a comprehensive evaluation of complex lower limb symptoms rather than an isolated complaint focusing specifically on the rectus femoris. The mild nature of a Grade 1 strain might have resulted in symptoms being initially attributed to general post-surgical discomfort or considered part of the overall quadriceps rehabilitation process before being recognized as a distinct pathological condition warranting advanced imaging.

When was the condition confirmed / formally diagnosed? The condition was formally diagnosed on 04 December 2018 when the MRI revealed "Rectus femoris also has a distal insertional high signal intensity...suggestive of grade 1 tear."

When did the veteran first present to you (or your practice) for this condition? May 5, 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 - Rectus Femoris Strain (Grade 1, distal insertion) was confirmed through:

MRI imaging on 04 December 2018 which demonstrated "Rectus femoris also has a distal insertional high signal intensity...suggestive of grade 1 tear"
The MRI findings clearly identify localized increased signal intensity at the distal insertion of the rectus femoris muscle consistent with a Grade 1 muscle strain, providing objective evidence of the muscle injury
Clinical correlation would typically include localized pain in the anterior thigh near the distal rectus femoris insertion, tenderness to palpation over the affected area, and pain with specific loading of the muscle (particularly combined hip flexion and knee extension), though the specific clinical presentation leading to the MRI is not explicitly detailed in the available records

MRI is the gold standard for evaluation of muscle injuries, providing detailed assessment of muscle architecture, fiber integrity, and associated edema or hemorrhage. The findings in this case are diagnostic of a mild (Grade 1) strain injury to the rectus femoris muscle at its distal insertion, characterized by microscopic fiber disruption with associated edema but without significant architectural distortion or muscle defect.

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.

forceful stretching or high intensity use of a muscle or tendon at the time of the clinical onset of a strain to that muscle or tendon MET

The development of the rectus femoris strain occurred in the context of rehabilitation following ACL reconstruction surgery. This rehabilitation process inherently involves progressive strengthening of the quadriceps muscle group, including both concentric and eccentric exercises that place significant stress on all quadriceps components, including the rectus femoris. In the post-surgical setting, altered biomechanics, muscle inhibition patterns, and compensatory movement strategies can create uneven loading across the quadriceps mechanism, potentially overloading specific muscle components. The biarticular nature of the rectus femoris (crossing both hip and knee joints) makes it particularly vulnerable to strain during rehabilitation exercises that simultaneously engage hip flexion and knee extension. The Grade 1 strain indicates a specific episode of forceful loading or stretching that exceeded the tensile strength of some muscle fibers at the distal insertion. The temporal relationship between the ACL surgery (November 2020) and the identification of the muscle strain (February 2021) is consistent with an injury occurring during the progressive rehabilitation phase, when exercise intensity and loading typically increase.

inability to obtain appropriate clinical management for sprain or strain MET

As established in the Full Federal Court in Brew v Repatriation Commission (14 May 1993), "inability" to obtain appropriate clinical management encompasses more than just access to care. Military service requirements often prevent optimal management of musculoskeletal injuries. Following ACL reconstruction, there can be significant pressure to progress rehabilitation quickly to meet return-to-duty timeframes, potentially leading to inadequate recovery between training sessions or progression to higher intensity exercises before full adaptation to previous loading levels. Additionally, the focus on regaining knee function following the ACL surgery may have resulted in less attention to early signs of muscle strain, delaying recognition and appropriate management. Military operational demands and fitness requirements would restrict the ability to provide optimal rest and recovery following initial strain symptoms, constituting an inability to obtain appropriate clinical management that would contribute to the persistence of the muscle strain.

The development of the rectus femoris strain in the veteran is attributable to several interrelated factors:

The rehabilitation process following his ACL reconstruction surgery on 26 September 2018, which involved progressive loading of the quadriceps mechanism in the setting of altered knee biomechanics
The biarticular nature of the rectus femoris muscle, making it particularly vulnerable to strain during combined hip flexion and knee extension exercises commonly used in ACL rehabilitation
Potential muscle inhibition patterns following knee surgery, where certain components of the quadriceps may be relatively inhibited, causing others to compensate with increased activity
The occupational demands of his role as an Airfield Defence Guard, which may have created pressure to accelerate rehabilitation and return to duty

The Grade 1 strain represents an acute/subacute event where a particular exercise or activity exceeded the tensile strength of some muscle fibers at the distal insertion of the rectus femoris. This is consistent with the SOP factor for "forceful stretching or high intensity use of a muscle or tendon at the time of the clinical onset of a strain to that muscle or tendon."

Additionally, the military context of the rehabilitation would have imposed limitations on optimal management, satisfying the factor for "inability to obtain appropriate clinical management for sprain or strain."

The % contribution of the causes is 100% and significant.

Sequelae

The rectus femoris strain is not a direct sequela of another condition but is pathophysiologically related to the recent ACL rupture and reconstruction through altered biomechanics and the rehabilitation process. While not directly caused by the knee injury, the muscle strain developed in the context of the post-surgical rehabilitation, representing a biomechanically linked but distinct condition.

Grade 1 muscle strains typically heal completely with appropriate management and rarely lead to significant sequelae. However, inadequate management could potentially lead to recurrent muscle strains or development of compensatory movement patterns affecting the entire lower limb kinetic chain.

Unintended Consequence

This condition represents a potential unintended consequence of medical management, specifically the rehabilitation process following ACL reconstruction surgery. While not a direct complication of the surgical procedure itself, the muscle strain developed in the context of the necessary rehabilitation program. The quadriceps strengthening required after ACL reconstruction, combined with altered biomechanics during the recovery period, created the conditions for excessive muscle loading and subsequent injury.

As per section 20.1 of the MRCA regarding Unintended Consequences of Medical Treatment, compensation may be payable when a member suffers an injury as an unintended consequence of medical treatment paid for by the Commonwealth. In this case, the rectus femoris strain can be reasonably considered an unintended consequence of the rehabilitation program following Commonwealth-funded ACL reconstruction surgery.

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. For muscle strains, appropriate management typically includes:

Relative rest and activity modification during the acute phase
Gradual and progressive return to loading with adequate recovery periods
Attention to biomechanical factors contributing to abnormal muscle loading
Graduated return to full activities only after adequate healing and functional recovery

The demands of the veteran role as an Airfield Defence Guard would make it difficult to fully implement these management strategies. Military service requirements often prioritize return to duty over optimal healing timelines, potentially leading to premature resumption of high-intensity activities. The physical fitness requirements for military service would restrict the ability to adequately modify activities to protect the healing muscle.

Additionally, the focus on regaining knee function and stability following ACL reconstruction may have resulted in less attention to signs of developing muscle strain, delaying recognition and appropriate management. The mild nature of a Grade 1 strain might have led to symptoms being dismissed as normal discomfort associated with rehabilitation exercises.

These service-related limitations constitute an inability to obtain appropriate clinical management that would contribute to the persistence and potential worsening of the muscle strain. Without optimal management, even mild muscle strains can progress to more severe injuries or develop into chronic muscle dysfunction with long-term functional implications.

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