Long Island Patella Fracture Lawyer

The patella — commonly called the kneecap — is a sesamoid bone embedded within the quadriceps tendon, positioned directly over the anterior surface of the knee joint. It serves as a crucial mechanical fulcrum for the extensor mechanism: by increasing the moment arm of the quadriceps muscle, the patella amplifies quadriceps force transmission to the tibia through the patellar tendon, enabling the knee extension required for walking, stair climbing, and virtually every weight-bearing activity. When a car accident fractures the patella, the damage is not merely to a small bone — it is to the entire extensor mechanism that allows the injured person to push off from a seated position, climb stairs, and walk without buckling.

The patella is the most commonly fractured bone in car accidents involving what orthopedic surgeons call the dashboard knee mechanism. During a frontal collision, the occupant's forward momentum drives the knee into the dashboard with force that biomechanical studies have measured in excess of 1,000 Newtons — sufficient to shatter the patella, tear the posterior cruciate ligament, dislocate the hip, and fracture the acetabulum in the same event. This constellation of injuries from a single dashboard impact is known as the dashboard triad and represents one of the most severe injury patterns in motor vehicle accident litigation.

Under New York Insurance Law §5102(d), any confirmed patella fracture causally related to a car accident constitutes a per se serious injury under the fracture category — no proof of permanency, surgery, or functional limitation is required to satisfy the threshold. This is the law established by the New York Court of Appeals in Oberly v. Bangs Ambulance Inc. (96 NY2d 295, 2001). At the Law Office of Jason Tenenbaum, P.C., we have represented patella fracture victims throughout Nassau County, Suffolk County, and New York City for over 24 years, recovering compensation ranging from $85,000 for conservative fracture management to $950,000 for comminuted fractures with PCL tear and post-traumatic arthritis.

Transverse fractures are the most common patella fracture pattern, accounting for 50 to 80% of all cases. They typically result from indirect force — a powerful eccentric contraction of the quadriceps against a flexed or braking knee — producing a horizontal fracture line through the mid-body or pole of the patella with separation of the superior and inferior fragments. Because the retinaculum may be torn, extensor mechanism disruption is common with displaced transverse fractures. The AO tension band wiring technique was specifically designed for this fracture pattern.

Comminuted or stellate fractures result from direct high-energy impact — the classic dashboard blow — and produce multiple fracture fragments radiating from the central impact point. Because anatomic reduction of multiple small fragments is often impossible, comminuted fractures may require plate-and-screw constructs, partial patellectomy, or in extreme cases total patellectomy. These are the most surgically challenging patella fractures and produce the greatest long-term disability.

Osteochondral fractures involve shearing of the articular cartilage surface, often producing a cartilaginous or osteocartilaginous fragment that may migrate within the joint as a loose body. These fractures frequently accompany patellar dislocation events and dashboard impacts with tangential shear forces. Damage to the trochlear groove cartilage is a common co-injury and a primary driver of post-traumatic patellofemoral arthritis.

Polar fractures involve the superior or inferior pole of the patella, often with avulsion of the patellar or quadriceps tendon attachment. Inferior pole fractures may be associated with patellar tendon avulsion, while superior pole fractures may involve quadriceps tendon disruption. Sleeve fractures are a variant seen in children and adolescents in whom the cartilaginous inferior pole avulses with a small bony fragment — these are easily missed on plain X-ray and require MRI for definitive diagnosis.

The dashboard knee mechanism is the dominant cause of patella fracture in motor vehicle accidents. During a frontal collision, Newton's first law dictates that the occupant continues forward at pre-collision velocity while the vehicle decelerates. Unless adequately restrained, the occupant's lower extremities travel forward and the knee contacts the dashboard or instrument panel below it. Biomechanical studies of occupant kinematics in moderate-speed frontal collisions have documented knee-to-dashboard contact forces exceeding 1,000 Newtons — roughly 225 pounds of force — concentrated over the small surface area of the anterior patella.

The force magnitude and direction determine the resulting injury pattern. Direct axial loading of the patella against the dashboard produces a comminuted or stellate fracture. A tangential impact with a shear component produces osteochondral shearing of the articular surface. The simultaneous forward momentum of the femur relative to the fixed tibia transmits posterior force through the knee joint, loading the posterior cruciate ligament (PCL) — which is why PCL tears are so commonly associated with dashboard knee injuries.

The dashboard triad — a term used in trauma orthopedics to describe the cluster of injuries produced by this mechanism — consists of: (1) patella fracture, (2) posterior cruciate ligament tear or avulsion, and (3) hip dislocation or acetabular fracture. In high-energy collisions, all three components may present simultaneously, creating an extremely complex polytrauma requiring staged orthopedic management. Hip dislocation is an orthopedic emergency requiring reduction within 6 hours to minimize the risk of avascular necrosis of the femoral head. Acetabular fractures may require pelvic reconstruction surgery. When the dashboard triad is present, total damages — including medical expenses, future surgeries, and vocational loss — can reach into the millions of dollars.

Airbag deployment is an additional mechanism: in vehicles without adequate knee airbags, the steering column and lower instrument panel may be the point of knee contact even after frontal airbag deployment. Side-impact collisions can produce patella fractures through door intrusion, with the door panel striking the lateral knee directly. Pedestrians struck by vehicles may sustain patella fractures when the vehicle hood or fender impacts the anterior knee.

Emergency physicians and orthopedic surgeons use a combination of clinical examination and imaging to diagnose and characterize patella fractures. Clinically, a displaced patella fracture presents with anterior knee pain and swelling, inability to actively extend the knee (extensor lag or complete loss of extension in severe cases), a palpable gap in the patella on direct palpation, and hemarthrosis (blood in the knee joint) producing marked swelling and effusion.

Plain X-rays are the primary imaging modality for initial diagnosis. Three standard views are obtained: the anteroposterior (AP) view, which demonstrates fracture pattern and fragment displacement; the lateral view, which reveals fragment separation, patella height (alta or baja), and sagittal alignment; and the sunrise (Merchant) view, which shows the patellofemoral articulation and patellar tilt in 45 degrees of flexion. The sunrise view is particularly important for identifying osteochondral lesions and assessing articular congruity.

CT scan is indicated for comminuted fractures where plain X-rays cannot adequately characterize fragment number, size, and displacement. CT scan is essential for pre-operative planning of complex comminuted fractures and for identifying intra-articular loose bodies. Three-dimensional CT reconstructions provide the orthopedic surgeon with the most detailed fracture map for surgical planning.

MRI is the modality of choice for evaluating soft tissue co-injuries including PCL tear, patellar tendon rupture, quadriceps tendon disruption, trochlear cartilage damage, and osteochondral lesions. MRI should be obtained in any patient with persistent knee pain disproportionate to the fracture, suspected PCL injury (posterior knee instability), or patellar tendon involvement. MRI findings of chondral damage to the patella or trochlear groove at the time of injury are critical evidence of future post-traumatic arthritis risk and significantly increase the damages calculation in personal injury litigation.

The long-term consequences of a patella fracture — whether treated operatively or non-operatively — frequently satisfy the permanent consequential limitation of use category of §5102(d) independent of the fracture per se threshold, dramatically increasing the legal value of the claim beyond the fracture alone.

Post-Traumatic Patellofemoral Arthritis: This is the most significant and prevalent long-term complication of patella fracture. The articular cartilage of the patella and trochlear groove, damaged by the initial fracture and compressive impact, progressively degenerates under the repetitive loading of daily activity. Radiographic evidence of patellofemoral joint space narrowing on Merchant/sunrise view, subchondral sclerosis, and osteophyte formation at the patellar margins typically develops within 2 to 5 years of injury. Clinically, post-traumatic patellofemoral arthritis produces anterior knee pain with stair climbing, squatting, and prolonged sitting with the knee in flexion — the classic "movie sign." In advanced cases, total knee arthroplasty (total knee replacement) is the treatment of last resort, adding a major future surgical procedure to the damages calculation.

Extensor Lag: Persistent loss of terminal active knee extension — measured as the difference between passive full extension and the maximum active extension the patient can achieve — results from lengthening or disruption of the extensor mechanism by the fracture or surgery. An extensor lag of more than 10 degrees is functionally significant, producing an abnormal gait pattern and inability to lock the knee in full extension for stair descent. An extensor lag greater than 20 degrees is a major functional disability.

Hardware Irritation and Migration: K-wire migration is a well-documented complication of the tension band wiring technique, affecting up to 40% of patients. Prominent K-wire ends produce subcutaneous irritation, skin breakdown, and bursitis. Hardware removal surgery — performed under general or spinal anesthesia — is the standard treatment and represents a distinct surgical procedure with its own period of restricted activity and physical therapy requirements.

Loss of Knee Flexion: Quadriceps contracture, patellar tendon fibrosis, and intra-articular adhesions following fracture and surgery commonly limit maximum knee flexion to less than the normal 135 degrees. Restricted flexion — particularly below 90 degrees — prevents deep squatting, kneeling, and stair descent, with profound occupational implications for manual laborers.

Avascular Necrosis of Fragments: The patella receives its blood supply from a vascular ring around its periphery; comminuted fractures that disrupt this ring can result in avascular necrosis of fracture fragments, causing fragment collapse and articular incongruity even after anatomic reduction.