Measurement of the knee flexion angle with smartphone applications: Which technology is better?

Measurement of the Knee Flexion Angle With a Smartphone-Application is Precise and Accurate

(2013) Jean-Yves Jenny   JOURNAL OF ARTHROPLASTY

Reliability of a smartphone-based goniometer for knee joint goniometry

(2012) Giorgio Ferriero et al.   INTERNATIONAL JOURNAL OF REHABILITATION RESEARCH

Validity and reliability of using photography for measuring knee range of motion: a methodological study

(2011) Justine M Naylor et al.   BMC MUSCULOSKELETAL DISORDERS

Measurement of knee joint motion using digital imaging

(2008) Damien Bennett et al.   INTERNATIONAL ORTHOPAEDICS

The Assessment of Intraoperative Prosthetic Knee Range of Motion Using Two Methods

(2008) Matthew S. Austin et al.   JOURNAL OF ARTHROPLASTY

Accuracy of Knee Range of Motion Assessment After Total Knee Arthroplasty

(2008) Carlos Lavernia et al.   JOURNAL OF ARTHROPLASTY

Ambulatory measurement of 3D knee joint angle

(2008) J. Favre et al.   JOURNAL OF BIOMECHANICS