75th Annual Meeting Podium Presentations
Adult Reconstruction Knee 3: Alignment, Kinematics and Computer Assisted Surgery
·In Vivo Knee Forces During Recreational Activities After Total Knee Arthroplasty
Podium No: 199 Thursday, March 06, 200808:24 AM - 08:30 AM Location: Moscone Convention Center
Room 3014-3018 Clifford W Colwell Jr, MD La Jolla CA
Darryl D D'Lima, MD La Jolla CA
Shantanu Patil, MS La Jolla CA
Nick Steklov La Jolla CA
Peter C Chen, PhD La Jolla CA Moderator(s):
Gerard Anderson Engh, MD Alexandria VA
Andrew A Freiberg, MD Boston MA
Knee forces were substantially lower during treadmill walking and biking than during jogging, playing tennis, or the golf swing.
Total knee arthroplasty (TKA) provides pain-free function for patients with end-stage arthritis. However, return to recreational and athletic activities is often restricted based on the potential for long-term wear and damage to the prosthetic components. Advice regarding safe and unsafe activities is typically based on the individual surgeon's subjective bias. We measured knee forces in vivo to develop a more scientific rationale for advice on post-TKA activities
Four patients underwent TKA with tibial trays that were instrumented to measure tibial forces. Tibial forces were measured at 1-year postoperatively for the following activities: treadmill walking, biking, jogging, golf swing, and tennis.
Walking on level ground generated mean peak force of 2.6±0.4 xBW (times body weight), while treadmill walking generated significantly lower forces 2.05±0.3 xBW. Biking at several intensities within patient tolerance and pedaling rates of up to 90 rpm generated mean peak forces 1.3±0.7 xBW. Jogging generated mean peak forces of 4.3±0.8 xBW. Golf swing generated mean peak forces of 4.5±0.6 xBW on the forward knee (left knee in right-handed golfers) and 3.2±0.4 xBW in the opposite knee. Playing tennis produced mean peak forces of 3.8±0.3, 3.6±0.3, and 3.1±.4 xBW while serving, forehand stroke, and backhand stroke, respectively.
Treadmill walking and biking appeared to be the safest activities especially for long-duration exercise. Surprisingly the golf swing also generated high forces in the forward knee. As expected, tennis, and jogging generated high forces. Modification of these activities such as altering the serve technique and treadmill jogging may reduce knee forces.
A · to the left of the title indicates the FDA has not cleared the drug or device for the described purpose.
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