Accuracy of Partial Weight Bearing After Autologous Chondrocyte Implantation  Jay R. Ebert, PhD, Timothy R. Ackland, PhD, FASMF, David G. Lloyd, PhD, David J. Wood, MS, FRCS, FRACS  Archives of Physical Medicine and Rehabilitation  Volume 89, Issue 8, Pages 1528-1534 (August 2008) DOI: 10.1016/j.apmr.2008.02.019 Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 With this load-bearing practice condition, the patient learns a new partial weight-bearing level on a set of scales to replicate that weight during walking. Archives of Physical Medicine and Rehabilitation 2008 89, 1528-1534DOI: (10.1016/j.apmr.2008.02.019) Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 Although static replication of weight bearing (WB) was only significantly greater (P<.017) than expected for the 20% and 60% BW weight-bearing conditions, patients exerted more than 5% BW over the expected target for the 20%, 40%, and 60% BW weight-bearing trials. Patients were within 5% BW for the 80% BW weight-bearing static condition. Archives of Physical Medicine and Rehabilitation 2008 89, 1528-1534DOI: (10.1016/j.apmr.2008.02.019) Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 3 Immediate dynamic replication of weight bearing (WB) was significantly greater (P<.017), and more than 5% BW over the expected target for 20%, 40%, and 60% BW weight-bearing trials, but dynamic replication was within 5% BW for the 80% BW weight-bearing condition. Dynamic replication of weight bearing improved (P<.017) over a 7-day retest period for the 20% BW weight-bearing level only. Archives of Physical Medicine and Rehabilitation 2008 89, 1528-1534DOI: (10.1016/j.apmr.2008.02.019) Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 4 Pearson correlations showed that patients who were poor at replicating weight-bearing (WB) restrictions statically were also poor at replication during gait, indicated by a moderately high relationship between static and dynamic weight-bearing replication error across all weight-bearing conditions. A high relationship existed within the 20% and 40% BW weight-bearing levels. Archives of Physical Medicine and Rehabilitation 2008 89, 1528-1534DOI: (10.1016/j.apmr.2008.02.019) Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions