16 peer-reviewed studies linked to Knee Pain (Limited Flexion) (diagnostic code 5260) in the VA Ready app, sourced from PubMed and the U.S. National Library of Medicine. Every citation is real and links to the source — bring them to your C&P exam or hand them to your VSO.
Cross-sectionalPrimary2026
Quantifying the Functional Impact of Chronic Patellofemoral Pain and Its Relationship to Perceived Duty-related Medical Readiness Among Active Duty Service MembersMilitary Medicine · 2026
- Chronic PFP significantly impairs duty-related medical readiness
- Functional limitation strongly correlates with self-reported inability to perform military tasks
- Occupational disability metrics for knee pain in service members
Why it matters: Functional impact data supports occupational/work-loss arguments for knee 5260
View on PubMed ↗Cohort studyPrimary2025
Pre-academy knee pain as a predictor of overuse knee injuries in first-year military cadetsBMJ Military Health · 2025
- Cadets with pre-academy knee pain had significantly elevated risk of overuse knee injury during training
- Dose-response between prior knee symptoms and subsequent pathology
- Military training as precipitating factor for chronic knee dysfunction
Why it matters: Causal pathway from military training to chronic knee injury for DC 5260/5261
View on PubMed ↗Meta-analysisPrimary2024
Best practice guide for patellofemoral pain based on synthesis of a systematic review, the patient voice and expert clinical reasoning.Br J Sports Med · 2024
- Synthesis of 65 high-quality RCTs informed 11 meta-analyses defining best-practice PFP management.
- Treatment should be individualized to background risk factors, symptoms and physical impairments.
- Six distinct interventions emerged as best-practice recommendations for PFP.
Why it matters: Provides the current evidence-based management standard for patellofemoral pain, establishing it as a recognized, treatment-requiring clinical condition.
View on PubMed ↗Cohort studyPrimary2023
Frontal plane projection angle predicts patellofemoral pain: Prospective study in male military cadetsPhysical Therapy in Sport · 2023
- Greater frontal plane projection angle predicted PFP development
- Lower extremity biomechanics during single-leg landing identify cadets at risk
- Biomechanical evidence for in-service onset of anterior knee pain
Why it matters: Service-connected biomechanical etiology for chronic knee pain under DC 5260
View on PubMed ↗Cohort studyPrimary2022
Epidemiology of Meniscus Injuries in the Military Health System and Predictive Factors for Arthroscopic SurgeryThe Journal of Knee Surgery · 2022
- Documents incidence and surgical predictors of meniscus injuries in active duty
- Identifies risk factors for progression to arthroscopic surgery
- Establishes high meniscal injury burden in military
Why it matters: Direct military-cohort evidence supports VA claims linking meniscal pathology to service
View on PubMed ↗Meta-analysisPrimary2020
Occupational Risk in Knee Osteoarthritis: A Systematic Review and Meta-Analysis of Observational Studies.Arthritis Care Res (Hoboken) · 2020
- Physically demanding jobs were associated with increased odds of knee OA (OR 1.52, 95% CI 1.37-1.69) versus sedentary work.
- Occupational kneeling, squatting, heavy lifting and demanding activity were implicated as exposures.
- Findings synthesized 71 studies across multiple occupational exposure types.
Why it matters: Provides primary-source evidence that physically demanding occupational load (kneeling, squatting, lifting) causes knee osteoarthritis, supporting service connection for physically demanding military duty.
View on PubMed ↗Meta-analysisPrimary2019
Risk factors for patellofemoral pain: a systematic review and meta-analysis.Br J Sports Med · 2019
- Quadriceps weakness, especially when normalized by BMI, was a risk factor for future PFP specifically in military recruits (SMD -0.69).
- Age, height, weight, BMI, body fat and Q angle did not predict future PFP.
- 10% of the pooled cohort developed PFP during follow-up.
Why it matters: Identifies modifiable physical risk factors for patellofemoral pain in military recruits, supporting an occupational/training-load basis for service connection.
View on PubMed ↗Cohort studyPrimary2019
Exploratory Study of 6-Month Pain Trajectories in Individuals With Predominant Patellofemoral Osteoarthritis: A Cohort Study.J Orthop Sports Phys Ther · 2019
- 85% of patients followed high (28%) or moderate (57%) pain trajectories that remained persistent over 6 months, with only 15% improving.
- Poor baseline KOOS scores, pressure sensitivity and lower knee-extensor strength predicted the high-pain trajectory.
- Distinct, largely non-improving pain trajectories exist in patellofemoral OA.
Why it matters: Shows that most patellofemoral osteoarthritis patients have persistent, non-improving knee pain, directly supporting chronic disability from this condition.
View on PubMed ↗Systematic reviewPrimary2019
Global management of patients with knee osteoarthritis begins with quality of life assessment: a systematic review.BMC Musculoskelet Disord · 2019
- Knee OA is associated with functional restrictions and pain that negatively impact quality of life.
- Activity limitations reduce social connectedness and psychological well-being in knee OA patients.
- Demographic, lifestyle and comorbidity factors (e.g., obesity, diabetes) influence quality of life.
Why it matters: Documents the broad functional and psychosocial impact of knee osteoarthritis, supporting the disability and quality-of-life dimensions of the claim.
View on PubMed ↗Systematic reviewPrimary2017
Can we predict the outcome for people with patellofemoral pain? A systematic review on prognostic factors and treatment effect modifiers.Br J Sports Med · 2017
- PFP is described as a multifactorial and often persistent knee condition.
- 12 studies examined prognostic factors and 12 examined treatment-effect modifiers across the review.
- Methodological limitations (retrospective designs, over-modeling) constrained the strength of prognostic conclusions.
Why it matters: Characterizes patellofemoral pain as commonly persistent and difficult to predict, supporting chronicity and ongoing disability in affected service members.
View on PubMed ↗Case seriesPrimary2016
Return to Duty Rates Following Meniscal Repair Surgery in an Active Duty Military PopulationMilitary Medicine · 2016
- Return-to-duty rates after meniscal repair in active duty soldiers
- Substantial proportion fail to return to full duty - chronic functional limitation
- Younger active-duty still experience persistent knee disability post-repair
Why it matters: Nexus between in-service meniscal surgery and lasting knee impairment
View on PubMed ↗Meta-analysisPrimary2015
Exercise for treating patellofemoral pain syndrome.Cochrane Database Syst Rev · 2015
- Exercise therapy may reduce pain and improve function in patellofemoral pain syndrome compared with control.
- Pain is characteristically provoked by stair climbing, squatting, running, cycling and prolonged sitting with flexed knees.
- Evidence quality was limited and heterogeneous across trials.
Why it matters: Confirms exercise therapy as the mainstay treatment for patellofemoral pain while underscoring that symptoms are activity-provoked and not fully resolved by treatment.
View on PubMed ↗Meta-analysisSupporting2024
Risk Factors for Depression in Patients With Knee Osteoarthritis: A Systematic Review and Meta-analysis.Orthopedics · 2024
- Pooled prevalence of comorbid depression among knee OA patients was 34% (95% CI 28%-41%).
- Bilateral knee pain (RR 1.38) and higher WOMAC pain scores were associated with comorbid depression.
- Female sex, obesity, analgesic use, slower gait and prolonged Timed Up and Go also predicted depression.
Why it matters: Establishes a high rate of secondary depression in knee osteoarthritis, supporting secondary-condition and comorbidity claims linked to chronic knee pain.
View on PubMed ↗Cohort studySupporting2023
What is the incidence of subsequent adjacent joint injury after patellofemoral pain?Clinical Rehabilitation · 2023
- Patients with PFP had elevated subsequent hip and ankle injuries
- Quantifies secondary-condition risk for VA secondary service connection
- Median time-to-secondary-injury reported
Why it matters: Primary support for VA secondary-condition claims off DC 5261
View on PubMed ↗Cross-sectionalSupporting2023
Global Burden of Disease Study 2019: an opportunity to understand the growing prevalence and impact of hip, knee, hand and other osteoarthritis in Australia.Intern Med J · 2023
- Knee OA prevalence grew 126% from 1990 to 2019; knee OA had the highest OA-related disease burden in 2019 (59,684 YLDs).
- 36% of knee OA burden was attributable to high BMI in 2019.
- Age-standardized YLD rates were higher for OA than for ischemic heart disease, stroke, dementia, diabetes or COPD.
Why it matters: Quantifies the large and growing disability burden of knee osteoarthritis relative to other major chronic diseases, contextualizing its functional impact.
View on PubMed ↗Cohort studySupporting2022
Prevalence of Musculoskeletal Injuries in New Zealand Army Recruits as Defined by Physical Therapy Service Presentations.Mil Med · 2022
- 1,683 physical-therapy injury presentations occurred during basic training over four years.
- Lower-limb injuries accounted for over 75% of all injury demand.
- Recruit injuries created high personal and organizational burden potentially threatening deployment capability.
Why it matters: Demonstrates that lower-limb (including knee) musculoskeletal injury dominates the burden of military basic training, supporting in-service causation of knee conditions.
View on PubMed ↗