Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooChondromalacia Patella

Knee

What It Is

The cartilage underneath your kneecap helps your knee move smoothly. Injury, overuse and various other factors can lead to chondromalacia patella, which means softening and breakdown of the cartilage that lies underneath the kneecap (American Academy of Orthopaedic Surgeons, n.d.a). It is often seen as part of patellofemoral pain (pain at the front of the knee and around the kneecap). The main symptom is pain at the front of the knee when squatting, kneeling, climbing up or down stairs, or sitting for a long time with your knees bent, such as in a seat with poor leg-room (American Academy of Orthopaedic Surgeons, n.d.a).

Chondromalacia Patella Anatomy

Three bones form the knee joint (American Academy of Orthopaedic Surgeons, n.d.b)

  • Femur – the thighbone, which runs from the hip down to the knee
  • Tibia – the shinbone, the main bone of the lower leg, which supports the weight of the body below the knee
  • Patella – the kneecap, which is connected by tendons above and below and sits in front of the joint to provide some protection

The ends of the femur and tibia, and the back of the patella, are covered with articular cartilage, a smooth, slippery layer that helps the bones glide over each other (American Academy of Orthopaedic Surgeons, n.d.b). This is the cartilage affected in chondromalacia. Separately, two C-shaped pieces of tougher, rubbery cartilage called menisci (singular: meniscus), the lateral and the medial meniscus, sit between the thighbone and shinbone and act as shock absorbers (American Academy of Orthopaedic Surgeons, n.d.b).

When the kneecap does not move (track) properly in the groove at the end of the thighbone, it may be pushed to one side, increasing pressure behind the kneecap and irritating the soft tissues. Poor tracking can be linked to the alignment of the legs, and to weak or imbalanced quadriceps (front thigh) and hip muscles (American Academy of Orthopaedic Surgeons, n.d.a).

Cartilage has no nerves, so damage to the cartilage itself cannot directly cause pain. However, it can lead to irritation of the joint lining and pain in the bone underneath (American Academy of Orthopaedic Surgeons, n.d.a).

How Is It Diagnosed?

Usually, your doctor can diagnose front-of-knee pain like this with a physical examination. In most cases they will also send you for an X-ray to rule out damage to the bones. An MRI scan may be used if your symptoms do not improve after a period of physical therapy and home exercise (American Academy of Orthopaedic Surgeons, n.d.a).

Not a diagnosis — for more information, contact me or another trusted healthcare provider.

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