Knee
Quadriceps Tendon Injuries
The knee joint is supported by several important tendons, which play a crucial role in stabilizing and facilitating the movement of the knee. The quadriceps tendon is located just above the patella and connects the quadriceps muscles in the front of the thigh to the patella. This tendon assists in extending the knee and is integral for movements such as jumping and climbing.
The quadriceps tendon is part of a larger biomechanical structure called the knee extensor mechanism. The knee extensor mechanism is comprised of the patellar tendon, quadriceps tendon, quadriceps muscle group, and the patella. Together, these anatomical structures work to facilitate extension (straightening) of the knee and stability to the knee joint.
What is a quadriceps tendon rupture?
A distal quadriceps tendon rupture is a specific type of injury that involves a tear or complete rupture of the quadriceps tendon near its attachment point at the patella. The quadriceps tendon is a strong band of tissue that connects the quadriceps muscles (a group of four muscles at the front of the thigh) to the patella, and it is an essential component of the knee extensor mechanism. When a distal quadriceps tendon rupture occurs, it can significantly impact the ability to straighten the knee and perform activities that require the use of the quadriceps muscles, including walking, jumping, and performing a straight leg raise.
What causes a quadriceps tendon rupture?
Quadriceps tendon ruptures are typically caused by a sudden, powerful contraction of the quadriceps muscle in your thigh. This can happen from a fall or during activities like jumping, landing, or sudden stops. Chronic overuse and degenerative changes can also contribute to quadriceps tendon injury, especially in older individuals.
What are the symptoms of a quadriceps tendon rupture?
- Severe pain in the front of the knee, typically above or around the kneecap.
- Swelling of the knee
- Inability to straighten your knee/perform a straight leg raise.
- Inability to bear weight on the leg.
- A noticeable gap or divot just above the kneecap
- Possible migration of the patella downwards.
How is a quadriceps tendon rupture diagnosed?
A combination of a comprehensive physical examination, x-rays, and an MRI are typically needed to accurately diagnose a quadriceps tendon injury. Dr. Bryan Penalosa and his team will perform a physical exam that will include palpating your knee for a tendon gap/divot, testing your ability to perform a straight leg raise, and assessing your range of motion. An x-ray will likely be obtained to rule out fracture and determine if the patella has migrated distally, a condition known as patella baja. An MRI will allow Dr. Bryan Penalosa to further evaluate the extent of the tendon injury as well as to evaluate the knee for any concomitant ligament, meniscal, or cartilage injuries.
Quadriceps Tendon Injuries Treatment Options
Can a quadriceps tendon rupture be treated without surgery?
In some cases, a partial rupture of the quadriceps tendon may be treated non-surgically with rest, immobilization using a hinged knee brace locked straight, and physical therapy. A platelet rich plasma (PRP) injection directly to the affected tendon can also help relieve knee pain and promote healing of the partial thickness tearing of the tendon. Moreover, extracorporeal shock wave treatments have also been shown to produce good outcomes.
However, it is important to note that complete quadriceps tendon ruptures often require surgical repair to regain full knee function. Additionally, even in cases of a partial quadriceps tendon rupture, if you cannot perform a straight leg raise, surgical intervention will likely be recommended.
What are the surgical options for a quadriceps tendon rupture?
Surgical options for quadriceps tendon ruptures typically involve reattaching the torn quadriceps tendon to the patella using sutures or non-metal anchors. The choice of surgical technique depends on the extent and location of the injury.
Recovering from Quadriceps Tendon Surgery
How long is the recovery after a quadriceps tendon repair/reconstruction?
Initially following the surgical repair of the quadriceps tendon, you will be allowed to bear full weight on the operative leg using crutches as tolerated by pain. You will be required to wear a hinged knee brace for 6 weeks following surgery. Initially, this brace will be locked straight. Physical therapy will begin immediately following surgery, and you will be allowed to gradually progress the range of motion of the operative knee over a period of 6 weeks per Dr. Bryan Penalosa’s quadriceps tendon repair/reconstruction post-operative protocol. Physical therapy is a crucial part of the recovery process to regain strength and mobility. Full recovery can take six months to a year.
Effects of an Untreated Quadriceps Tendon Injury
What are the long-term effects of an untreated quadriceps tendon rupture?
An untreated quadriceps tendon rupture can lead to chronic knee pain, weakness, and a significant loss of knee function. It can also increase the risk of developing osteoarthritis in the affected knee over time. Therefore, prompt treatment is crucial to prevent long-term complications.