A recent head to head study comparing ERMI High Intensity in-home mechanical therapy devices with low intensity stretch devices was conducted on Total Knee Arthroplasty patients with decreased Range of Motion. The study contrasted, from baseline to follow up Range of Motion and WOMAC outcome scores. The High Intensity ERMI Knee/Ankle Flexionator resulted in significantly improved Range of Motion and knee related outcome scores from baseline to follow up.
The majority of patients (91%) who utilized the ERMI Knee/Ankle Flexionator were able to achieve functional range of motion greater than 110 degrees. By comparison, a much smaller group (22%) who used the low intensity device increased their range of motion to that same level.
Furthermore, these results statistically correlated with increased outcome scores because patients were able unable to perform activities of daily living significantly better. We believe as motion increases, so does a person’s ability to perform activities of daily living without pain. The study used The Western Ontario and McMaster Universities Arthritis Index (WOMAC). WOMAC is a widely used, proprietary set of standardized questionnaires used by health professionals to evaluate the condition of patients with osteoarthritis of the knee and hip, including pain, stiffness, and physical functioning of the joints. WOMAC measures five items for pain (score range 0–20), two for stiffness (score range 0–8), and 17 for functional limitation (score range 0–68). . Physical functioning questions cover everyday activities such as stair use, standing up from a sitting or lying position, standing, bending, walking, getting in and out of a car, shopping, putting on or taking off socks, lying in bed, getting in or out of a bath, sitting, and heavy and light household duties.
Source: Papotto and Mills Treatment of severe flexion defecits following total knee arthroplasty. A Randomized Clinical Trial. Journal of Orthopaedic Nursing. January/February 2012. 31(1). 29-34