Alterations in quadriceps and hamstrings coordination in persons with medial compartment knee osteoarthritisJoseph A Zeni
Department of Physical Therapy, University of Delaware, 301 McKinly Laboratory, Newark, DE 19716, USA
J Electromyogr Kinesiol 20:148-54. 2010
..This occurs despite differences in freely chosen walking speed. Although subjects with OA had higher co-contraction than the control group, co-contraction may not increase with disease severity...
Dynamic knee joint stiffness in subjects with a progressive increase in severity of knee osteoarthritisJoseph A Zeni
University of Delaware, Department of Physical Therapy, 301 McKinly Laboratory, Newark, DE 19716, USA
Clin Biomech (Bristol, Avon) 24:366-71. 2009
..While these individual kinetic and kinematic changes are well documented, the interaction between changes in joint moment and changes in joint angle (dynamic joint stiffness) is not well understood in persons with knee osteoarthritis...
- Differences in gait parameters between healthy subjects and persons with moderate and severe knee osteoarthritis: a result of altered walking speed?
Joseph A Zeni
Department of Physical Therapy, University of Delaware, 301 McKinly Laboratory, Newark, DE 19716, USA
Clin Biomech (Bristol, Avon) 24:372-8. 2009
..The objective of this study was to investigate the influence of walking speed on biomechanical variables associated with joint loading in persons with varying severities of medial compartment knee osteoarthritis...
- Knee osteoarthritis affects the distribution of joint moments during gait
Joseph A Zeni
Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
Knee 18:156-9. 2011
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- Early postoperative measures predict 1- and 2-year outcomes after unilateral total knee arthroplasty: importance of contralateral limb strength
Joseph A Zeni
Department of Physical Therapy, University of Delaware, 301 McKinly Laboratory, Newark, DE 19716, USA
Phys Ther 90:43-54. 2010
..Total knee arthroplasty (TKA) has been shown to be an effective surgical intervention for people with end-stage knee osteoarthritis. However, recovery of function is variable, and not all people have successful outcomes...
- Gait parameters and stride-to-stride variability during familiarization to walking on a split-belt treadmill
Joseph A Zeni
Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
Clin Biomech (Bristol, Avon) 25:383-6. 2010
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- Most patients gain weight in the 2 years after total knee arthroplasty: comparison to a healthy control group
J A Zeni
Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
Osteoarthritis Cartilage 18:510-4. 2010
..The objective of this study was to determine if a reduction in body mass index (BMI) was present following unilateral total knee arthroplasty (TKA) compared to an age-matched healthy control group who did not have surgery...
- Preoperative predictors of persistent impairments during stair ascent and descent after total knee arthroplasty
Joseph A Zeni
Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
J Bone Joint Surg Am 92:1130-6. 2010
..The purpose of the present study was to determine preoperative predictors of handrail use during stair ascent and descent following primary unilateral total knee arthroplasty...
- Comparison of electromyography and joint moment as indicators of co-contraction
Brian A Knarr
Biomechanics and Movement Science, University of Delaware, Newark, DE 19716, United States
J Electromyogr Kinesiol 22:607-11. 2012
..Overall, the application of two co-contraction methods provides a more complete description of muscle co-contraction and joint loading than either method individually...
- Clinical predictors of elective total joint replacement in persons with end-stage knee osteoarthritis
Joseph A Zeni
Department of Physical Therapy, University of Delaware, Newark, DE, USA
BMC Musculoskelet Disord 11:86. 2010
..The purpose of this study was to determine which clinical factors will predict the decision to undergo TKA in individuals with end-stage knee OA. Knowledge of these factors will aid in clinical decision making for the timing of TKA...
- Gait after unilateral total knee arthroplasty: frontal plane analysis
Ali H Alnahdi
Graduate Program in Biomechanics and Movement Science, University of Delaware, 301 McKinly Lab, Newark, Delaware 19716, USA
J Orthop Res 29:647-52. 2011
..While the non-operated knee loading was not different from controls, there may be greater risk of cumulative loading in the non-operated knee of the TKA group given the shorter step length...
- Measuring functional improvement after total knee arthroplasty requires both performance-based and patient-report assessments: a longitudinal analysis of outcomes
Ryan L Mizner
Department of Physical Therapy, University of Delaware, 301 McKinly Laboratory, Newark, Delaware 19716, USA
J Arthroplasty 26:728-37. 2011
..Patient perception fails to capture the acute functional declines after TKA and may overstate the long-term functional improvement with surgery...
- Clinical outcomes after simultaneous bilateral total knee arthroplasty: comparison to unilateral total knee arthroplasty and healthy controls
Joseph A Zeni
Department of Physical Therapy, University of Delaware, Newark, Delaware 19716, USA
J Arthroplasty 25:541-6. 2010
..In addition, most 2-year clinical measures were no different between the surgical and control groups. Subjects medically appropriate for bilateral TKA should be afforded this option...
- Muscle impairments in patients with knee osteoarthritis
Ali H Alnahdi
Graduate Program in Biomechanics and Movement Science, University of Delaware, Newark, Delaware, and King Saud University, Riyadh, Saudi Arabia
Sports Health 4:284-92. 2012
..Understanding the extent of muscle impairments, its relationship with physical function and disease progression, and the evidence behind exercise therapy that targets muscle impairments is crucial...
