Ankle Sprain in a Diabetic Patient with a Missed Fracture Concern
A 34-year-old man presents 5 days after an inversion injury playing football. He has lateral ankle swelling and bruising, pain 5/10 at rest, and cannot bear weight without crutches. He is tender over the lateral malleolus and the base of the fifth metatarsal, but there is no tenderness over the posterior medial malleolus or navicular. He has type 1 diabetes with an HbA1c of 9.2% and reduced sensation in both feet to monofilament testing. He has not had an X-ray and was told by a friend it was 'just a sprain'. He wants to return to football within two weeks.
1. What is your assessment and immediate action regarding imaging?
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I would apply the Ottawa ankle rules. He has bone tenderness at the lateral malleolus and at the base of the fifth metatarsal, and he cannot bear weight, so he meets criteria for an X-ray of the ankle and foot. The absence of medial tenderness does not exclude a fracture. I would refer him for imaging before starting any loading programme, and I would not manipulate or aggressively test the ankle until fracture is excluded.
His diabetes adds urgency: impaired sensation and poor glycaemic control increase the risk of a missed injury, delayed healing, and later Charcot-type problems, though the Charcot risk is greater in neuropathy with midfoot injury. I would inspect both feet, check for any ulceration or skin breakdown, and advise him to keep the foot elevated and avoid walking on it until reviewed. I would document the Ottawa findings and the referral clearly.
2. Assuming imaging is normal, how would you structure rehabilitation given his diabetes and his two-week target?
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I would be honest that two weeks is unrealistic for a safe return to football. Lateral ligament healing typically takes 4-6 weeks for functional return, and his diabetes and HbA1c of 9.2% may slow tissue healing and raise infection risk if there is any skin break.
Weeks 1-2: protect and reduce swelling (elevation, compression, gentle range of motion), restore pain-free dorsiflexion, begin isometric and then resistance work for the peroneals and calf, and start proprioceptive training in sitting and double-leg stance. Weeks 2-4: progress to single-leg balance, hopping, and change of direction, then sport-specific drills. Throughout, I would check his feet daily for blisters or skin damage, ensure well-fitting footwear with adequate cushioning, and advise him to keep glucose controlled, coordinating with his diabetes team. I would also give crutches until he can walk without a limp. Return criteria: no swelling, full pain-free range, single-leg hop symmetry, and completion of sport-specific training.