Dashboard injury and PCL injury: what to know

The posterior cruciate ligament, or PCL, connects the thighbone to the shinbone and helps control backward movement of the shin. In a vehicle collision, a bent knee striking the dashboard can deliver force to the front of the shin. The injury may be a ligament strain, a partial tear, or a complete tear, and other knee structures can be hurt at the same time. Pain, swelling, difficulty bending the knee, or a feeling that the knee gives way can follow, although symptoms vary. A clinician may examine knee stability and use imaging when needed to understand the injury.

Arrange a medical assessment after a significant dashboard impact, especially if walking is difficult or the knee feels unstable. Until assessed, protect the leg, avoid twisting and impact, and use support only as advised. Ice wrapped in cloth and elevation may help with early swelling. Treatment depends on the tear, associated injuries, activity needs, and examination findings. Some isolated injuries are managed with structured rehabilitation and, in selected cases, a knee brace; more complex injuries may need surgery. Follow a staged return to movement and strengthening rather than testing the knee through pain.

Seek urgent care if the knee looks deformed, becomes rapidly more swollen, cannot bear weight, or the foot becomes cold, pale, numb, or weak. Emergency assessment is also appropriate after a collision when there is severe pain, an open wound, or concern about other injuries. Contact the treating clinician promptly for increasing redness, warmth, drainage, fever, or worsening pain after treatment. A new locking sensation or repeated buckling deserves review because it can affect rehabilitation planning.

Ask which part of the PCL is injured, whether another ligament or bone is involved, and what examination or imaging showed. Clarify whether a brace is suitable, how much weight you may place on the leg, which exercises are safe now, and what milestones guide driving, work, sport, or surgery decisions.