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Kneecap Injuries – Causes and Treatment

Kneecap injuries affect the patella and are commonly caused by falls or sports accidents. They lead to pain, swelling, and limited mobility of the knee joint.

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Things worth knowing about "Kneecap Injuries"

Kneecap injuries affect the patella and are commonly caused by falls or sports accidents. They lead to pain, swelling, and limited mobility of the knee joint.

What Are Kneecap Injuries?

The kneecap (medically known as the patella) is a small, triangular bone located at the front of the knee joint. It protects the joint and transmits the force of the thigh muscles to the lower leg. Kneecap injuries encompass a wide range of damage, including fractures (broken bones), dislocations (luxations), and injuries to the surrounding ligaments and tendons. They are common in everyday life and sports and can significantly limit knee mobility.

Causes

Kneecap injuries can result from several mechanisms:

Direct trauma: A fall onto the knee, a collision, or a direct blow to the kneecap – for example during sports or traffic accidents – is a common cause of a patella fracture.
Indirect force: A sudden, forceful contraction of the quadriceps muscle can cause the kneecap to fracture or the patellar tendon to rupture.
Dislocation (luxation): A kneecap dislocation occurs when the patella slips out of its normal position in the trochlear groove. This frequently happens during twisting movements or sudden changes of direction.
Overuse: Chronic overloading can lead to conditions such as patellar tendinopathy (Jumper's Knee) or chondromalacia patellae (cartilage damage on the underside of the kneecap).

Symptoms

The symptoms of a kneecap injury depend on the type and severity of the damage. Typical complaints include:

Severe pain at the front of the knee, especially with movement or weight-bearing
Swelling and bruising around the kneecap
Limited range of motion – straightening or bending the knee may be painful or impossible
Instability of the knee, particularly following a dislocation
Visible deformity of the kneecap in cases of complete dislocation
Clicking or grinding sensations when moving the knee

Diagnosis

Diagnosis of a kneecap injury involves a physical examination combined with imaging studies:

Physical examination: The physician palpates the kneecap, assesses mobility, and checks for swelling or misalignment.
X-ray: The standard method for detecting fractures and positional abnormalities of the patella.
Magnetic Resonance Imaging (MRI): Provides detailed images of cartilage, ligaments, and tendons and is used when soft tissue injury is suspected.
Ultrasound: Can be used as a complementary tool to assess tendons and ligaments.

Treatment

Conservative Treatment

Many kneecap injuries can be managed without surgery:

Immobilization: The knee is stabilized with a brace or cast for several weeks.
Ice application and elevation: Help reduce swelling and pain during the acute phase.
Pain management: Use of analgesics such as ibuprofen or paracetamol.
Physiotherapy: Targeted exercises to strengthen the quadriceps and improve the stability of the knee joint.

Surgical Treatment

In cases of severe fractures, complete tendon ruptures, or recurrent dislocations, surgery is often necessary:

Osteosynthesis: Realigning bone fragments using screws, wires, or plates.
Tendon repair or reconstruction: Repairing torn tendons around the kneecap.
Trochleoplasty or tibial tubercle osteotomy: Procedures to permanently stabilize the kneecap in patients with chronic dislocation tendency.

Rehabilitation

Rehabilitation after a kneecap injury is essential for a full recovery. It includes physiotherapy exercises to strengthen the quadriceps, improve proprioception (body awareness), and gradually increase load-bearing capacity. The duration of recovery varies depending on the type of injury, ranging from a few weeks to several months.

References

Egol KA, Koval KJ, Zuckerman JD: Handbook of Fractures. Lippincott Williams and Wilkins, 5th edition, 2015.
Duthon VB: Acute traumatic patellar dislocation. Orthopaedics and Traumatology: Surgery and Research, 2015; 101(1): S59-S67.
World Health Organization (WHO): Musculoskeletal conditions. Available at: https://www.who.int/news-room/fact-sheets/detail/musculoskeletal-conditions

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