Patella Fracture (Kneecap Break) Treatment
The patella — or kneecap — is a small, triangular bone that sits at the front of the knee joint, serving as both a protective shield for the joint and a critical mechanical lever that connects the quadriceps muscles to the shinbone and allows the leg to straighten with power. A direct blow to the knee from a fall onto a hard surface, a dashboard impact during a car accident, or a collision during contact sports can fracture the patella — and because the quadriceps tendon and patellar tendon attach directly to the top and bottom of the kneecap, even the pulling force of these muscles can displace the fragments and widen the fracture gap. A broken kneecap is a serious fracture injury that can completely disrupt the knee’s extensor mechanism, making it impossible to straighten the leg or bear weight. Prompt specialist evaluation with imaging is essential to determine the fracture pattern and whether surgical intervention is needed to restore the kneecap’s structural integrity and the knee’s ability to function.
Dr. Jonathan Glashow is a board-certified orthopedic surgeon and Clinical Associate Professor of Orthopedic Surgery at NYU Grossman School of Medicine, widely recognized as one of New York City’s top knee specialists. With over 30 years of experience and more than 15,000 orthopedic procedures performed — including published research on patellar viability and the knee’s extensor mechanism in the peer-reviewed orthopedic literature — he brings a deep, evidence-based understanding of kneecap biomechanics to every patella fracture he treats. As Chief Medical Officer for the New Jersey Devils and Philadelphia 76ers, Dr. Glashow manages acute knee injuries in professional athletes where restoring full extensor function and returning to competition are paramount. Named a Castle Connolly Top Doctor every year since 2000, he offers same-day X-rays, immediate evaluation, and emergency surgical capability for patella fractures at his Upper East Side practice in New York City.
Causes and Symptoms of a Broken Kneecap
The patella is a triangular bone positioned on the front of the knee, protecting the joint and connecting the quadricep muscles to the tibia (shinbone). A kneecap break is a common injury when a person lands on a hard surface on their knee, or direct impact hits the knee in an accident or contact sport. Some kneecap breaks are simple, with just one break. Other serious knee injuries can shatter the patella into several pieces, or create an open fracture that breaks the skin. Symptoms include:
- Knee pain
- Swelling and bruising of the knee
- Unable to extend the leg
- Unable to perform a straight leg raise
- Difficulty walking
A simple, or stable, patella fracture may be treated without surgery. In these types of kneecap breaks, the pieces of bone remain in place and the kneecap is stable. A splint or cast can be used to hold the kneecap in place while the fractures heal.
Displaced, open or comminuted (shatter) fractures of the patella often will require surgery. The quadricep muscles can easily pull the pieces of a broken kneecap out of place. Surgery can involve removing any bone fragments and repairing the kneecap with surgical hardware, followed by immobilization and rehabilitation.
Expert medical care for a patella fracture is vital for complete recovery. Contact our office today to schedule your appointment. Jonathan Glashow, MD, Orthopedic Surgery & Sports Medicine offers emergency appointments for knee injuries, including kneecap breaks, at our medical clinic on the Upper East Side of NYC.
Frequently Asked Questions About Patella Fractures
How do I know if my kneecap is broken?
A broken kneecap typically produces immediate, severe pain at the front of the knee, rapid swelling and bruising over the kneecap, and an inability to straighten the leg or perform a straight leg raise. You may feel a gap or depression in the bone when touching the front of the knee, and attempting to walk or bear weight is usually extremely painful or impossible. Because significant swelling can also accompany patellar dislocations and severe knee sprains, Dr. Glashow recommends X-rays for any knee injury involving these symptoms to confirm whether a fracture is present.
What types of patella fractures are there?
Patella fractures are classified by their pattern and severity. A stable or non-displaced fracture involves a crack in the bone where the pieces remain in proper position. A displaced fracture means the fragments have separated — often pulled apart by the quadriceps tendon — creating a gap that prevents the knee’s extensor mechanism from functioning. A comminuted fracture occurs when the kneecap shatters into three or more pieces. An open fracture means the broken bone has pierced through the skin, which carries a significant risk of infection and requires emergency surgical treatment.
Do all broken kneecaps require surgery?
No. Stable, non-displaced patella fractures — where the bone fragments remain in alignment and the patient can still perform a straight leg raise — can often be treated with a knee immobilizer or cast for four to six weeks, followed by physical therapy to restore range of motion and quadriceps strength. However, the majority of patella fractures involve at least some displacement because the quadriceps and patellar tendons pull the fragments apart, disrupting the extensor mechanism. When fragments are displaced, comminuted, or the patient cannot straighten the leg, surgical repair is needed.
What does patella fracture surgery involve?
The surgical approach depends on the fracture pattern. For displaced two-part fractures, Dr. Glashow typically uses a tension band wiring technique — in which stainless steel wires and pins compress the fragments together and convert the pulling force of the quadriceps into a compressive force that promotes healing. For comminuted fractures, a combination of screws, wires, and cerclage cables may be used to reconstruct the kneecap. In severe cases where the bone is too fragmented to repair, partial or complete removal of the patella (patellectomy) with reattachment of the quadriceps and patellar tendons may be necessary — though this is considered a last resort because the kneecap plays a vital role in knee mechanics.
How long does recovery take after a broken kneecap?
Recovery timelines depend on the fracture severity and treatment approach. Non-surgical cases typically require four to six weeks of immobilization before beginning physical therapy. Surgical patients may begin gentle, supervised range-of-motion exercises within the first one to two weeks — the hardware provides enough stability to allow early motion, which is critical for preventing the stiffness that commonly follows patella fractures. Most patients return to daily activities within two to three months and to full sports or high-impact activity within four to six months. Dr. Glashow coordinates rehabilitation closely with physical therapists, with a particular focus on restoring quadriceps strength and full knee extension.
Can a patella fracture cause long-term knee problems?
Most patella fractures heal well with proper treatment, but potential long-term complications include post-traumatic patellofemoral arthritis — particularly when the fracture involves the joint surface on the underside of the kneecap — persistent anterior knee pain, quadriceps weakness, loss of knee flexion, and hardware irritation from the wires or pins used during surgical repair. Hardware removal is a common secondary procedure once the bone has fully healed if the metalwork causes discomfort. Early specialist evaluation, anatomical reduction of the fracture, and a disciplined rehabilitation program are the most effective ways to minimize these risks.
