Subjective and objective outcome measures after total knee replacement: is there a correlation?

Abstract

A comprehensive assessment of outcomes after TKR requires both subjective and objective assessments. Walking ability and speed are important to the TKR patient and are representative of their pain and function.

Correlations between patient-perceived outcome and objectively-measured biomechanical change following Total Knee Replacement

“…There are, however, important methodological differences in the objective performance-related measures considered within these studies. Comparisons between perception-based and performance-based measures in TKR cohorts have typically compared common PROMs with maximal performance tests which offer no information on quality of movement, such as the Timed Up and Go [ 4 , 5 , 22 ], Six Minute Walk [ 4 , 5 , 23 ], Stair Test [ 4 , 5 ], and Five Sit to Stand [ 7 ] tests. In contrast, objective quantification of the B(OA) using a combination of PCA and the Cardiff Classifier uses only measures which indicate the quality of movement.…”

Common Objective Measurements for Strength, Balance, and Function in the Arthroplasty Patient

“…Fleeton et al [11] reported that knee instability symptoms 6 months postoperatively were associated with reduced muscle power in the stairclimb test conducted 6 weeks postsurgery. Graff et al [12] found significant relationships a mean of 2 years postoperatively between the TUG and scores on the Knee Society Score, Knee Injury and Osteoarthritis Outcome Score, and the Oxford Knee Score (r = 0.51-0.77; P < 0.05).…”

Objective performance tests assess aspects of function not captured by self-report in knee osteoarthritis

“…Several studies have examined associations between self-report measures of pain and function and objective performance tests in adults with knee OA. Most of these studies were performed in persons with OA who underwent joint replacement [ [9] , [10] , [11] , [12] ], with more limited research among persons with knee OA who are treated nonoperatively [ 13 ].…”