This is a published protocol for a prospective double-blinded RCT at University College Hospital. It compares robotic arm-assisted functionally aligned TKA (FA) versus robotic arm-assisted mechanically aligned TKA (MA) in 100 patients with knee osteoarthritis. No outcome data are reported — the paper establishes the study design, surgical technique specifications, and outcome measurement plan.
Up to 20% of patients are dissatisfied after an uncomplicated TKA, and suboptimal alignment is a leading suspected cause. The literature comparing kinematic and mechanical alignment has been difficult to interpret because prior trials mixed implant designs and used manual cutting blocks with poor reproducibility.
This trial controls both confounders — same implant, robotic execution in both arms. Giving it the strongest design yet for isolating the effect of alignment philosophy.
When counseling patients or choosing alignment strategy, recognize the 3° varus–3° valgus overall alignment boundary in the FA arm as the protocol-defined safety limit. Functional alignment is not unconstrained. It is patient-specific anatomy within a defined safe corridor.
The 11-point WOMAC MCID threshold is the number that defines clinical significance in TKA outcomes research. Know it for boards and for critically appraising future alignment studies.
This is a published protocol for a prospective double-blinded RCT at University College Hospital. It compares robotic arm-assisted functionally aligned TKA (FA) versus robotic arm-assisted mechanically aligned TKA (MA) in 100 patients with knee osteoarthritis. No outcome data are reported — the paper establishes the study design, surgical technique specifications, and outcome measurement plan.
Up to 20% of patients are dissatisfied after an uncomplicated TKA, and suboptimal alignment is a leading suspected cause. The literature comparing kinematic and mechanical alignment has been difficult to interpret because prior trials mixed implant designs and used manual cutting blocks with poor reproducibility.
This trial controls both confounders — same implant, robotic execution in both arms. Giving it the strongest design yet for isolating the effect of alignment philosophy.
When counseling patients or choosing alignment strategy, recognize the 3° varus–3° valgus overall alignment boundary in the FA arm as the protocol-defined safety limit. Functional alignment is not unconstrained. It is patient-specific anatomy within a defined safe corridor.
The 11-point WOMAC MCID threshold is the number that defines clinical significance in TKA outcomes research. Know it for boards and for critically appraising future alignment studies.