Two grayscale clinical photographs demonstrating instruments used for measuring anterior tibial translation (ATT) during the Lachman test, an orthopedic physical examination for anterior cruciate ligament (ACL) integrity.

A clinical photograph and diagnostic setup showing a physician performing the Lachman test manually for stress radiography. The patient is in a supine position on a radiolucent examination table. The physician, wearing a lead apron, protective gloves, and a mask, is positioned beside the patient's right knee. One hand is placed on the distal femur to stabilize the leg, while the other hand is positioned on the proximal tibia. A white arrow indicates the anterior translatory force applied to the tibia relative to the femur, a maneuver used to assess the integrity of the Anterior Cruciate Ligament (ACL). Above the patient's knee, a digital X-ray tube head with a control display is positioned to capture the joint laxity under stress. This clinical scenario demonstrates the integration of physical examination maneuvers with medical imaging to objectively quantify knee instability and ligamentous laxity.

Educational panel illustrating the components and clinical application of an arthrometry system for assessing knee ligament laxity. Images A and B show the accessory Bluetooth-connected dynamometer, which features a teardrop-shaped ergonomic housing with a blue control panel (labeled FGP BLU), a power icon, an LED indicator, and integrated Velcro straps for secure attachment. The reverse side (B) displays a padded, hand-contoured interface with a white-bordered perimeter. Image C demonstrates the clinical use of the system during a physical examination (such as a Lachman test). The arthrometer is positioned atop the patient's flexed knee with supports on the patella and distal tibia, while the examiner applies anterior traction to the proximal tibia. The examiner holds the accessory dynamometer against the posterior aspect of the patient's leg, allowing the system to concurrently quantify applied force and anterior tibial translation in millimeters. This setup is designed to provide objective data for diagnosing anterior cruciate ligament (ACL) injuries and monitoring knee joint stability.

This clinical photograph demonstrates the performance of the Lachman test, a primary physical examination maneuver used to assess the integrity of the anterior cruciate ligament (ACL). The image shows a patient in the supine position with the knee joint passively flexed to approximately 20-30 degrees. The examiner’s hands are strategically positioned for orthopedic assessment: one hand stabilizes the distal femur just superior to the patella, while the other hand grasps the proximal tibia at the level of the tibial tuberosity. The procedure involves applying a brisk anterior force to the tibia relative to the femur to evaluate for anterior translation and the quality of the 'end-point' resistance. Increased laxity or a soft end-point indicates a potential ACL tear. This visual is representative of clinical orthopedic and sports medicine evaluations, serving as a pedagogical tool for teaching physical diagnosis of knee instability.