What should you know about patellar tendon rupture test?

Testing for patellar tendon rupture combines a physical examination of active knee extension with imaging when the diagnosis is uncertain. The clinician asks how the injury happened, looks for swelling or a tendon gap, and checks whether you can lift the straight leg. The examination is adapted if pain or swelling makes movement unsafe.

You may be asked to tighten the thigh and lift the leg while keeping the knee straight. The clinician compares this with the other side and feels around the kneecap and tendon. A preserved straight-leg raise does not always exclude a smaller tear, so pain, strength, alignment, and the injury mechanism also matter.

X-rays can show a fracture, kneecap displacement, or other bony clues. Ultrasound can assess tendon continuity at the bedside. Magnetic resonance imaging may be used when the tear level, extent, or other soft-tissue injury remains unclear. No single test replaces a careful examination.

Keep the knee supported and avoid repeated straight-leg tests, squats, stairs, and forceful stretching until assessed. Tell the clinician about prior knee surgery, medicines, wounds, and any pop or fall. If a rupture is confirmed, the next discussion may include Tendon Repair Surgery and protection in a brace.

Once the repair or chosen treatment allows movement, Post-Operative Rehabilitation can rebuild control and strength progressively. Follow the prescribed restrictions even if pain improves before the tendon is ready for loading.

Arrange urgent assessment after a sudden pop with loss of active straightening, marked swelling, deformity, or inability to walk safely. Seek emergency help for an open injury, uncontrolled bleeding, a cold or numb foot, severe calf swelling, chest pain, or breathlessness. These signs need rapid evaluation beyond a routine appointment.

Ask what the physical findings show, whether an X-ray or soft-tissue scan is needed, and whether the tear is partial or complete. Discuss safe weight bearing, brace settings, timing of Tendon Repair Surgery if recommended, and how Post-Operative Rehabilitation will be monitored.