Patella instability has traditionally been assessed by physical examination with manual displacement of the patella at various levels of knee flexion. Much of the data recorded during these exams have been fraught with examiner variability and poor reproducibility.
The potential of having an instrumented device that produces accurate and reproducible measurement (data) would be a welcome addition to our ability to define treatment parameters (both nonsurgical and surgical) and substantiate outcome measures for this common condition.
This study indicates, that using a Porto Patellofemoral Testing Device that measures patella laxity, that displacement measurements were highly reproducible and superior to manual testing results. If these results hold up in similarly designed studies, is user friendly and reasonably priced, it would be a valuable tool for physicians treating patella femoral instability conditions.
Peter Joki, MD
Department of orthopedics and rehabilitation
New Haven, Connecticut
Disclosures: Joki reports no relevant financial disclosures.