Unloading the Infrapatellar Fat Pad: Implications for Anterior Knee Pain

Introduction: A Common but Overlooked Cause of Knee Pain

Anterior knee pain is often attributed to patellofemoral dysfunction, tendinopathy, or degenerative change. Yet one frequently overlooked structure in the diagnostic process is the infrapatellar fat pad (also known as Hoffa’s fat pad). Richly innervated and vascularized, this soft tissue structure can become inflamed, impinged, and a major generator of anterior knee pain, especially during extension and weight-bearing tasks.

Inflammation or mechanical irritation of the fat pad is sometimes misdiagnosed as patellar tendinopathy or persistent chondral overload, leading to treatments that fail to address the root cause. For physiotherapists and sports medicine clinicians, understanding how to clinically assess and unload the fat pad is crucial to resolving pain and restoring knee function (Dragoo et al 2012, McConnell 2016).

Fat Pad Syndrome: Pathomechanics and Presentation

The infrapatellar fat pad sits just beneath the patella and behind the patellar tendon. When the knee moves into terminal extension, the fat pad can become pinched between the femoral condyles and the tibia causing inflammation. Additionally, the inferior pole of the patella can tip into the fat pad during forced extension and irritate it. 

Typical clinical signs of fat pad irritation include:

• Pain located just inferior to the patella Pain from the IFP can be inferior, retro as well as medial thigh (Bennell et al 2004)

• Exacerbation of pain during full extension (e.g. going upstairs, tumble turn off the wall during swimming and even rapid kicking in freestyle, prolonged standing, and if severe, even walking (McConnell 2013))

• Pain also can be exacerbated on full flexion

• Tenderness on palpation inferior pole of the patella 

• Swelling infrapatellar region.

The Role of Taping in Unloading the Fat Pad

In 2012, I co-authored a review in Sports Medicine detailing the evaluation and treatment of fat pad-related pain. A core recommendation was the use of rigid taping to offload the inflamed fat pad, repositioning the patella upward and medially to relieve mechanical pressure during activity.

This taping strategy achieves three key outcomes:

• Unloads the fat pad, minimising the irritation and decreasing the pain.

• Improves patellar alignment, promoting more efficient patellofemoral kinematics

• By decreasing the pain, allows patients to move more confidently and begin corrective exercises that don’t keep inflaming the tissue. Clinicians must avoid giving patients quads sets, straight leg raises and leg extension exercises as this will further inflame the fat pad and significantly delay recovery.

At McConnell Therapeutics, our Rigid Tape and Under Tape system is designed to deliver consistent, clinically validated results in this context. Applied with proper technique, taping can offer immediate relief and help reintroduce function without aggravating symptoms.

Adjunctive Rehabilitation Strategies

Taping is only one component of a broader rehabilitation plan. Clinicians should also address the underlying mechanics contributing to fat pad overload:

• Improve the control of the quadriceps and gluteal muscles, particularly the gluteus medius, to improve frontal plane control and reduce dynamic valgus

• Stretch tight structures - the lateral retinaculum or IT band if tightness is contributing to patellar tilt or compression and anterior hip structures which causes internal femoral rotation and increases lateral tracking of the patella.

• Modify gait patterns to avoid terminal knee extension and excessive heel strike, especially in runners

These strategies were also emphasized in the 2016 review published in Physical Medicine and Rehabilitation Clinics of North America, which highlighted conservative care for anterior knee pain in runners and active individuals.

Clinical Takeaway: Think Beyond the Tendon

In a running, or jumping athlete the infrapatellar fat pad should be considered as a probable pain source, rather than just focussing on the patellar tendon, as being the pain generator. With careful assessment and an evidence-based unloading strategy that includes rigid taping and functional re-training, clinicians can reduce pain, restore mobility and help patients return to activity with greater comfort. 

For clinicians seeking wholesale access to the full McConnell Therapeutics range, register for clinic access. 

References

Bennell K, Hodges P, Mellor R, Bexander C, Souvlis T. 2004 The nature of anterior knee pain following injection of hypertonic saline into the infrapatellar fat pad. J Orthop Res 22(1):116-21.

Dragoo, J.L., Johnson, C., & McConnell, J. (2012). Evaluation and treatment of disorders of the infrapatellar fat pad. Sports Med, 42(1), 51–67.

Dye, S.F. (2005). The pathophysiology of patellofemoral pain: a tissue homeostasis perspective. Clin Orthop Relat Res, 436, 100–110.

McConnell J. 2013 Management of a difficult knee problem.Man Ther.;18(3):258-63.

McConnell J. Running Injuries: The Infrapatellar Fat Pad and Plica Injuries.Phys Med Rehabil Clin N Am. 2016 Feb;27(1):79-89.