The Anterior Cruciate Ligament (ACL) is frequently assessed using the Lachman test. This test involves linear translation of the tibia on the femur. Meta-analysis and systematic reviews report a wide range of diagnostic accuracy. The purpose of this case report was to establish a proof of concept using a novel device, the Mobil-Aider™, to accurately quantify linear translation of the tibia on the femur.
Radiographs were taken at baseline and in maximal anterior translation of the tibia in a healthy knee. The Mobil-Aider device was strapped on the knee and used to quantify the translation.
The digital reading of the Mobil-Aider was 7.10 mm while the difference between the radiographs measured 6.96 mm.
This report demonstrates a proof of concept. It used a known measure from a radiograph to demonstrate the ability of the Mobil-Aider device to accurately measure the linear translation of the tibia on the femur, i.e. a Lachman test.
Despite being a single case report, this evidence can begin to establish a body of knowledge to quantify joint mobility and assess injury.