What is normal TTTG?

In addition, it demonstrated that MRI is a reliable method in assessment of TTTG and identified normal value for TTTG at 10.9±2.5 mm.

How do you measure TTTG?

Patellar translation can be measured using the tibial-tuberosity to trochlear groove distance (TT-TG distance) by calculating the transverse length between the trochlear groove on the femoral and tibial tuberosity on axial images. The measurements are used to quantify patellar instability.

What is patellofemoral instability?

Patellofemoral instability is a result of malalignment of the patella in the trochlear grove caused by stretched or ruptured medial kneecap-stabilizers (traumatic) or anatomical anomalies of the knee joint.

What is the Trochlear groove?

The patella rests in a groove on top of the femur called the trochlear groove. When you bend and straighten your knee, the patella moves back and forth inside this groove. A slippery substance called articular cartilage covers the ends of the femur, trochlear groove, and the underside of the patella.

What is a patella alta?

Patella alta or high-riding patella refers to an abnormally high patella in relation to the femur. The patella sits high on the femur where the groove is very shallow. Here, the sides of the femoral groove provide only a small barrier to keep the high-riding patella in place.

What is patellar tracking disorder?

Patellar tracking disorder means that the kneecap (patella) shifts out of place as the leg bends or straightens. In most cases, the kneecap shifts too far toward the outside of the leg.

Where is the medial patellofemoral ligament?

The medial patellofemoral ligament is a broad structure located on the inside of the knee joint. It connects the kneecap (patella) to the thigh bone (femur). The primary purpose of the MPFL is to provide stability to the kneecap; it provides restraint to any movement toward the outside of the knee.

How do you treat knee instability?

Treatments for knee instability

1. Rest, ice and elevation to reduce pain and swelling.
2. Nonsteroidal anti-inflammatory drugs (NSAIDs), which can also reduce pain and swelling.
3. A knee brace to support the knee as it heals.
4. Physical therapy to improve strength and mobility.

What does patellar instability feel like?

You may experience the following symptoms with patellar subluxation: buckling, catching, or locking of the knee. slipping of the kneecap to the outside of the knee. pain after extended sitting.

What is the groove in the knee called?

The V-shaped patella sits in a groove at the front of the femur of the knee, called the trochlear groove.

Does chondromalacia patella need surgery?

In many cases, due to the fact that the kneecap has been out of line for a person’s whole life, the condition worsens with activity and improves with rest. Many patients elect to have this problem surgically corrected. Surgically correcting this problem is relatively easy with arthroscopic surgery.

Can patella alta be cured?

Treatment of patella alta If a patient has significant patella alta that is causing specific problems (instability and/or patellofemoral wear/pain) then this can be treated effectively by surgically shifting the patella downwards by however far is necessary to put it into the normal position.

What is the normal TT-TG distance for a knee?

What is the normal TT-TG Distance? It is normally about 9mm, and if it´s more than 15-20mm then it means that the alignment of the groove with the tendon attachment is poor, tending to pull the kneecap over to the outer side.

How is the tttg measured on a CT scan?

CT scan is the gold standard for the measurement of the tibial tuberosity-trochlear groove distance (TTTG). The aim of this study was to evaluate the reliability of the TTTG on MRI compared to CT scan. Twelve knees in 11 patients underwent CT and MRI examination for patellofemoral instability or ant …

Where to find tttg distance on MRI tibial tubercle?

The TTTG distance ( yellow line) is the distance between the first two lines. Place your cursor over the deepest part of the trochlear groove. Scroll down with the cursor not moving until you get to the patella tendon insertion.

How is the trochlear groove measured in a knee?

Twelve knees in 11 patients underwent CT and MRI examination for patellofemoral instability or anterior knee pain. Both the bony and the cartilaginous landmarks of the trochlear groove were used for the measurement of the TTTG.

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