Are Soldiers at Higher Risk of Knee Osteoarthritis After Service?
Yes, soldiers are at substantially higher risk of developing knee osteoarthritis after military service due to the inherent physical demands of military duties that include frequent kneeling, heavy lifting, repetitive joint use, and high-impact activities—all of which are established risk factors for osteoarthritis development.
Evidence Supporting Increased Risk
The 2020 VA/DoD Clinical Practice Guideline explicitly recognizes that "the activities that place patients at higher risk for OA are an integral part of the daily duties of many who serve or have served in the US military" 1. This acknowledgment from the highest-level military medical guideline directly confirms the occupational hazard.
Specific Military Risk Factors
Military service exposes personnel to multiple established OA risk factors simultaneously:
- Heavy physical demands: Military duties routinely involve heavy labor, which has strong evidence for increasing knee OA risk 2
- Kneeling and squatting: These activities show strong evidence for increased knee OA risk in both men and women 2, and are unavoidable in military operations
- Repetitive lifting and carrying: Strong evidence links lifting activities to increased OA risk 2, particularly relevant given military load-bearing requirements
- High-impact activities: The guideline notes strong associations between high-impact sports like sky diving (common in military training) and OA development 1
Injury as a Compounding Factor
Military training itself carries elevated injury risk, which further compounds OA risk:
- Training injury rates: During basic training, injury incidences are 1.7-2.2 times higher for women than men performing identical training 3
- Stress fractures: Female soldiers face 2-10 times higher risk of stress fractures compared to male counterparts in the same training 3
- Previous injury cascade: History of musculoskeletal injury is a documented risk factor for future injury 3, and traumatic knee injuries substantially increase subsequent OA risk 4
Clinical Implications for Post-Service Care
Screening Recommendations
Veterans presenting for care should be assessed for:
- Occupational exposure history: Document years of service, military occupational specialty (MOS), and specific physical demands (combat roles, airborne operations, heavy equipment operation)
- Prior injuries: Particularly knee trauma, stress fractures, or chronic overuse injuries during service
- Current symptoms: Early morning stiffness, activity-related pain, functional limitations
Management Approach
When OA is diagnosed in veterans, the VA/DoD guideline recommends 1:
Initial treatment plan should include:
- Self-management programs with regular exercise
- Weight reduction if overweight/obese (comprehensive lifestyle intervention)
- Soft knee braces for stability and weight burden reduction
- Topical NSAIDs or capsaicin as first-line pharmacotherapy
- Acetaminophen or oral NSAIDs for moderate-to-severe pain
Second-line considerations:
- Physical therapy referral based on pain severity and functional limitations
- Duloxetine (60 mg daily) for persistent pain
- Intra-articular corticosteroids or hyaluronic acid injections
Critical caveat: The guideline recommends against initiating opioids (including tramadol) for OA pain management due to limited benefit and high risk of adverse effects 1.
Important Clinical Pitfalls
Don't wait for radiographic changes: Clinical diagnosis based on history and examination is appropriate; routine MRI is not recommended 1
Recognize the service connection: Veterans may be eligible for VA disability compensation for service-connected OA, making documentation of occupational exposure critical
Address modifiable factors early: Weight management and appropriate exercise programs can modify disease progression even after service-related damage has occurred
Avoid opioid prescribing: Despite chronic pain complaints common in this population, evidence does not support opioid therapy for OA 1
The evidence unequivocally demonstrates that military service, through its combination of heavy physical demands, repetitive joint stress, and elevated injury risk, places service members at increased risk for developing knee osteoarthritis that manifests during or after their military careers.