Walking Cane for Knee Osteoarthritis: Load Transfer, Contralateral Use, and Evidence

Knee osteoarthritis (OA) is one of the most prevalent musculoskeletal conditions affecting adults over 50, and it is one of the strongest evidence-based indications for walking cane use. The biomechanical case for a walking cane in knee OA is well-established: the cane reduces the external knee adduction moment, which is the primary mechanical driver of medial compartment knee OA progression.

How Knee OA Affects Gait

Knee OA produces characteristic gait changes:

Antalgic gait: Shortened stance phase on the painful side, lateral trunk lean, and reduced walking speed to minimise knee load
Varus thrust: In medial compartment OA (by far the most common type), the knee may buckle outward during stance phase as the medial compartment collapses -- visible as a dynamic varus movement
Reduced knee flexion during swing: The patient reduces knee flexion during the swing phase to avoid pain at the extremes of range
Reduced push-off: Pain at the knee reduces the power generated at push-off, reducing gait efficiency

The Knee Adduction Moment and Medial Compartment Loading

The knee adduction moment (KAM) is the rotational force at the knee that tends to push the knee into varus (bow-legged) position during walking. It is the most important mechanical variable in medial compartment knee OA because:

High KAM is associated with faster cartilage loss and OA progression
Medial compartment load is proportional to KAM
Interventions that reduce KAM (lateral wedge insoles, gait retraining, cane use) reduce medial compartment load and potentially slow OA progression

Contralateral Cane Use and KAM Reduction

A cane held in the hand opposite the affected knee reduces the KAM through a moment arm mechanism:

The cane creates a ground reaction force on the opposite side from the affected knee
This reduces the adduction moment at the affected knee during stance phase
Studies have demonstrated KAM reductions of 20-40% with contralateral cane use
This reduction is both immediate (pain relief during walking) and potentially disease-modifying over time if sustained use reduces cumulative cartilage load

Which Hand for the Cane in Knee OA

The cane is held in the hand opposite to the affected knee:

Right knee OA: cane in left hand
Left knee OA: cane in right hand
Bilateral knee OA: cane in hand opposite the more affected knee; bilateral crutches if bilateral severe OA

Knee OA Cane Use: Evidence Summary

Outcome	Without Cane	With Contralateral Cane
Knee adduction moment (KAM)	Elevated in medial OA	Reduced 20-40%
Medial compartment load	High	Reduced proportional to KAM reduction
Walking pain	Pain-limited distance	Reduced pain, extended distance
OA progression (long-term)	Progressive	Potentially slower with sustained KAM reduction
Cane side	Not applicable	Contralateral to affected knee