Maurer 1999.

Methods	RCT Method of randomisation: random number generator, stratified by disease severity Assessor blinding: yes Participant blinding: no, but attention control group Loss to Follow‐up: 15 Intention‐to‐treat analysis: no Post‐program follow up: yes ‐ at 12 weeks (after 8 weeks of training)
Participants	Location: USA N = 113 Sample: people with diagnosed OA of the knee Age: mean 66.3 years (SD 8.8) in treatment group Inclusion criteria: met current American College of Rheumatology criteria for OA, between 50‐80 years, receiving no drugs for their arthritis other than stable doses of analgesics or NSAIDs, had mild to moderate knee pain for at least the previous 3 months, scored 1‐3 on the Kellgren radiographic scale Exclusion criteria: concurrently receiving physical therapy, actively involved in any other pharmaceutical or exercise study or had undergone isokinetic strength training within the previous 3 years, had significant cardiovascular disease, more than mild knee swelling, large popliteal cysts, knee instability, major hip or knee surgery on the side to be treated, systemic disease other than OA that might affect muscle function, severe osteopenia, history of fracture in the area of the joint to be treated, paresis of the lower extremity
Interventions	PRT versus control 1. PRT Type of Ex: 1 LL Equipment: isokinetic dynamometer Intensity: appears high Frequency: Ex3 Reps/Sets: 3 reps at 3 speeds (total 9 reps) in 3 sets Program Duration: 8 weeks Setting: gym Supervision: not reported Adherence: not reported 2. Control Group: four classes on OA education and self‐management
Outcomes	Primary: WOMAC, SF‐36 Secondary: strength (isokinetic dynamometer), AIMS index Comments on adverse events: yes
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear