Cane Selection and Hip Abductor Load in Right Hip Osteoarthritis
Ms. R., 68, has right hip osteoarthritis and an 8-week goal of walking 30 minutes without stopping. She walks 0.8 m/s, reports right lateral hip pain 6/10 after 12 minutes, and uses a single-point cane in her right hand with the grip at greater-trochanter height. During right single-leg stance her left pelvis drops about 2 cm and she leans her trunk over the right hip. She weighs 78 kg, has mild wrist soreness from the cane, and no cognitive or upper-extremity limitations. She asks whether changing the cane will let her walk farther or whether she should focus only on hip-abductor strengthening. You have one 40-minute session and a follow-up in two weeks; she wants to reduce pain medication use and is willing to practice a home program twice daily.
1. Which hand should hold the cane, and at what height? Justify your answer with moment-arm and ground-reaction-force reasoning, including the effect on right hip abductor demand.
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Use the cane in the left hand, not the right. The cane is a ground-reaction-force (GRF) input that should oppose the moment created by body weight about the painful right hip. With the cane on the left, its vertical force acts at a lateral distance from the right hip joint; that external moment helps support the pelvis on the right stance side and reduces the required right hip abductor force. The hip abductors have a very short moment arm (roughly 5 cm), so even a modest cane force applied with a larger moment arm can substantially unload them. A cane in the right hand shares load but does little to reduce right abductor demand and can reinforce the trunk lean already seen.
Height: set the grip at the ulnar styloid/wrist crease with the arm relaxed, which usually places the tip about 15–20 cm lateral to the foot; the elbow should be 15–30° flexed. The current greater-trochanter height plus wrist soreness suggests it is too low or she is bearing weight through a flexed wrist. Recheck that the shoulder is relaxed and the cane tip sits slightly anterior and lateral to the foot for a reciprocal gait pattern.
2. She asks whether to prioritize cane adjustment or hip-abductor strengthening. What do you recommend for the next two weeks, and how will you measure change?
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Prioritize both, but sequence them. First two weeks: adjust the cane and teach a reciprocal pattern (cane opposite the forward leg), because immediate pain reduction improves walking tolerance and allows higher-quality strengthening. Do not tell her the cane is a permanent substitute; frame it as a training aid that lets her accumulate steps while the abductors adapt.
Strengthening: sidelying hip abduction, standing hip abduction with a band, and single-leg stance with pelvic control, 2–3 sets of 8–12 quality reps, twice daily as tolerated. Avoid fatiguing her before walking. Because she has a Trendelenburg sign, include frontal-plane trunk control: stand on the right leg while keeping the pelvis level and trunk upright, 3 × 20–30 s.
Measures at two weeks: pain NRS during a 6-minute walk, distance walked before pain reaches 4/10, single-leg stance time, observed pelvic drop, and cane-use confidence. A successful trial is not just less pain; it is increased walking distance with reduced trunk lean and no increase in wrist symptoms.