Validation of the OMERACT-OARSI Responder Index: Responders Have Better Overall Health Status than Non-responders Marc C. Hochberg, Barker Bausell, Kevin Frick, Donald Steinwachs and Brian Berman University of Maryland School of Medicine and The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA

Objective n To validate the OMERACT-OARSI Responder Index n Test the hypothesis that patients with knee OA participating in a clinical trial who fulfil the OMERACT-OARSI Responder Index will have better overall health status as measured by both arthritis-specific and general measures.

Patient Cohort n 570 patients with symptomatic knee OA enrolled in a randomized, 3-arm, 6- month, parallel group trial –Traditional Chinese acupuncture –“Sham” acupuncture –Education/attention control

Outcome Measures n WOMAC Osteoarthritis Index –Likert format n Patient Global Assessment n Health Assessment Questionnaire (HAQ) n Medical Outcomes Study (MOS) SF-36 n European Quality of Life (EuroQoL)

Data Analysis n Data from all 3 treatment groups pooled for this analysis n Responders identified using OMERACT- OARSI Responder Index –Pham T et al: J Rheumatol 2003;30: n Outcomes in responders compared to those in non-responders using Students’ t-test n Analysis conducted on ITT population –Sensitivity analysis on completers only

Baseline Characteristics (N=570) n Age –Mean (SD) = 65.5 (8.6) years n Sex –Men (36%), Women (64%) n Race –White (69%), Black (29%), Other (2%) n Marital status: Married (60%) n Education: High-school graduates (91%)

Baseline Data (N=570) n WOMAC OA Index –Pain 43.5 (17.0) –Function 45.3 (17.6) –Total 45.6 (16.6) n HAQ –Pain 1.4 (0.7) –Disability 0.62 (0.41) n EuroQoL –EQ-5D 0.63 (0.22) –EQ-VAS 75.9 (16.7) n MOS SF-36 –Phys Funct 40.3 (22.3) –Role Phys 44.3 (40.1) –Bodily Pain 45.2 (19.9) –Gen Health 70.6 (17.9) –Role Emot 73.3 (37.5) –Vitality 54.2 (20.8) –Ment Heal 79.4 (14.2) –Social Act 79.3 (23.0)

Comparison of Outcomes by OMERACT-OARSI Response n 236 (41.4%) of 570 patients randomized achieved an OMERACT-OARSI Response at the end of study –61% of 386 completers

WOMAC Scores by OMERACT- OARSI Response

HAQ Scores by OMERACT- OARSI Response

EuroQoL Scores by OMERACT- OARSI Response

SF-36 Scores by OMERACT- OARSI Response

Comparison of Outcomes by OMERACT-OARSI Response n 234 (43%) patients randomized achieved an OMERACT-OARSI Response at the end of study –61% of patients completing the study n Responders had significantly better arthritis- specific and general health status than non- responders based on the WOMAC, HAQ, SF- 36 and EuroQoL instruments (P < for all comparisons)

Conclusion n These data validate the OMERACT- OARSI Responder Index. –Results unchanged when analysis performed only with completers (N = 386) n OMERACT-OARSI Responder Index should be considered as primary outcome for clinical trials of symptomatic therapies in patients with OA.

State Measures - 2 n Minimal Clinically Important Improvement (MCII) –Smallest change in measurement that signifies an important improvement in a patient’s symptom –75%ile of distribution of change score among those who had good or excellent improvement with therapy Tubach F et al: Ann Rheum Dis 2005;64:29-33

State Measures - 2 n Patient Acceptable Symptom State (PASS) –Value in a measurement of a patient’s symptom beyond which the patient considers herself well –75%ile of distribution of absolute score among those who are satisfied with their current state after therapy Tubach F et al: Ann Rheum Dis 2005;64:34-7

State Measures in OA Patients n MCII –Pain 177 (33%) –Function 220 (41%) –Global 136 (25%) n PASS –Pain 241 (44%) –Function 221 (41%) –Global 177 (33%) Highly significant association between achieving an OMERACT-OARSI Response and having either an MCII or a PASS for each of the 3 domains, especially pain and function.

Measurement of clinical outcomes n WOMAC Osteoarthritis Index n Lequesne Algofunctional Index n Knee Injury and Osteoarthritis Outcome Score (KOOS) –Roos EM, Lohmander LS: HQLO 2003;I:64

Knee Rating Scales for Athletic Patients n Modified Lysholm Scale n Cincinnati Knee Rating System n AAOS Sports Knee Rating Scale n ADL Scale of the Knee Outcome Survey n Single Assessment Numeric Evaluation n Knee Injury and OA Outcome Score n QoL Outcome Measure for Chronic ACL Def n International Knee Documentation Committee Marx RG: Arthroscopy 2003;19:1103-8

KOOS n Evaluates both short- and long-term consequences of knee injury n 42 items in 5 separately scored domains –Pain –Other symptoms –Function in daily living –Function in sport and recreation –Knee-related quality of life

KOOS n Validated in several populations –Surgical reconstruction of ACL –Knee arthroscopy –Meniscectomy 16 years previously –Total knee arthroplasty –Autologous cartilage transplantation

KOOS n Reliable n Responsive –Effect sizes > 1.0 for all 5 subscales in patients undergoing arthroplasty and tibial osteotomy –Effect sizes > 0.5 for all 5 subscales in patients undergoing ACL reconstruction and meniscectomy

KOOS vs. WOMAC n KOOS contains WOMAC pain, function and stiffness subscales (Likert v3.0) n KOOS adds 18 questions covering sport and recreational function, knee-related quality of life and other symptoms n Larger effect sizes with KOOS –Younger subjects with knee injury –Older subjects with total knee arthroplasty

Summary n There are numerous options for assessing clinically relevant outcomes in trials of products used for cartilage repair n KOOS is the recommended self-report measure of pain, function and QoL –“

Other Potential Clinical Outcomes n Time to joint replacement surgery n Time to indication for joint replacement surgery n Time to fulfil criteria for joint replacement surgery n Time to failure of therapy n Proportion of patients with success on Rx

Clinically relevant outcomes n Time to TJR –TJR is a cost-effective procedure –Recommended after failure of medical Rx –Limitations Variability in decision to perform TJR Length of surgical waiting lists (queue) Patient related factors, including willingness Racial/ethnic and gender disparities

Clinically relevant outcomes n Time to decision to perform TJR –Same limitations re: surgeon’s variability n Time to fulfil criteria to perform TJR –Objective scoring based on pain, loss of function and health-related QoL –Appropriateness criteria –Subject of a SIG during OMERACT 7 Maillefert JF et al: J Rheumatol; in press. Follow-up meeting was held in Paris 17/12/04

Clinically relevant outcomes n Time to treatment failure –Prespecified amount of joint space loss –Significant worsening of pain and/or function n Proportion of patients with success –Lack of loss of joint space by a prespecified amount –Clinically relevant improvement in pain and/or function

Prevention of the Occurrence of Incident OA n Definition of incident OA –Structural Arthroscopy Radiography MRI –Symptomatic

ACI Compared with Microfracture in the Knee n RCT: 80 patients followed for 2 years n Similar clinical outcomes –Lysholm and VAS pain score –Significant difference in SF-36 PCS favoring microfracture group n Similar structural outcomes –Arthroscopy –Histology of cartilage biopsies Knutsen et al: J Bone Jt Surg 2004;86-A:455-64

Thank you for your time and attention.