Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooPatellar Tracking Dysfunction

Knee

What It Is

Patellar tracking dysfunction happens when the kneecap (patella) slides slightly out of place as the leg straightens or bends. The kneecap may shift too far toward the outside of the leg or, in some people, toward the inside of the leg (AAOS, n.d.a). It is one form of patellofemoral pain (pain around and behind the kneecap) and is sometimes called "patella mal-tracking" (St George's University Hospitals NHS Foundation Trust, 2026).

Knee joints are complex hinges joining the shin bone (tibia) with the thighbone (femur). The kneecap is held in place at the front of the joint by tendons along the top and bottom, by ligaments along the sides, and by a sheath of tissue around the kneecap called the retinaculum. A layer of cartilage lines the underside of the kneecap, which helps it glide along a groove at the end of the thighbone, called the trochlear groove (AAOS, n.d.a).

The kneecap can tilt or shift off track if the groove is too flat (AAOS, n.d.b) or if the cartilage becomes damaged. Weakness or tightness in the thigh and hip muscles can also contribute to the kneecap moving off track (AAOS, n.d.a; St George's University Hospitals NHS Foundation Trust, 2026).

Patellar Tracking Dysfunction Anatomy

The knee is one of the biggest and most complex joints in the body. It joins the shin bone and the thigh bone together, with the kneecap sitting at the front (AAOS, n.d.a). Tendons connect the leg muscles to the knee bones so that the knee joint can move. Ligaments join the knee bones together and give the knee stability.

The anterior cruciate ligament (ACL) is the one that prevents the femur from sliding backward along the tibia.

The medial and lateral collateral ligaments (on the inner and outer sides of the knee) make sure the femur doesn't slide from one side to the other.

The posterior cruciate ligament (PCL) prevents the femur from sliding forward along the tibia.

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

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