Ankle Sprain in a Basketball Player: When to Image and When to Play
A 22-year-old college basketball player lands on an opponent's foot and inverts his right ankle during practice. He is able to bear weight but limps. Exam 30 minutes post-injury: swelling and tenderness over the lateral malleolus and anterior talofibular ligament (ATFL), no tenderness over the posterior medial malleolus or the base of the fifth metatarsal, no bony tenderness at the navicular. He has pain with the anterior drawer but the talus translates ~5 mm more than the uninjured side with a firm endpoint. He wants to know if he can play in the conference tournament in 10 days. He has had two prior ankle sprains on the same side.
1. Does he need radiographs? Apply the Ottawa Ankle Rules to this case.
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No radiographs are indicated based on the Ottawa Ankle Rules.
The rules require imaging if there is pain in the malleolar zone AND any of:
- Bony tenderness at the posterior edge or tip of the lateral malleolus (A) - he has lateral malleolar tenderness, so this criterion is met.
- Bony tenderness at the posterior edge or tip of the medial malleolus - absent.
- Inability to bear weight both immediately and in the ED (4 steps) - he can bear weight.
Wait - he does have lateral malleolar tenderness, which technically meets a criterion. The rules are designed to be highly sensitive (near 100%) at the cost of specificity, so a positive rule does not mandate a fracture; it mandates imaging. In practice, the combination of ability to bear weight, no medial tenderness, no fifth metatarsal/navicular tenderness, and a firm endpoint on drawer makes fracture very unlikely, but the rules as written would support an X-ray if lateral malleolar tenderness is bony.
The exam nuance: distinguish ligamentous from bony tenderness. If tenderness is over the ATFL and soft tissue rather than the bone itself, the rule is not triggered. Document this distinction. Given two prior sprains and a firm endpoint, a grade II lateral sprain is the working diagnosis; imaging can be deferred with close follow-up, but if any doubt, a single view series is low-cost.
2. How do you grade the injury and what does the anterior drawer finding mean?
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Grade II (moderate) lateral ankle sprain, primarily ATFL.
- Grade I: stretch, no laxity, minimal swelling, able to bear weight.
- Grade II: partial tear, increased laxity with a firm endpoint, moderate swelling, pain with weight-bearing. This patient: ~5 mm increased translation with a firm endpoint = grade II.
- Grade III: complete tear, no endpoint, marked laxity, often unable to bear weight.
The firm endpoint is the key finding - it means the ATFL is stretched/partially torn but not completely disrupted. A soft or absent endpoint would suggest grade III and warrants more caution and possibly MRI if surgical management is considered (rarely first-line).
Also assess the syndesmosis (external rotation stress, squeeze test, tenderness over the anterior inferior tibiofibular ligament) and the deltoid/medial side - high ankle sprains have longer recovery and different return-to-play timelines.
3. Build a 10-day return-to-play plan and identify the criteria that would keep him out of the tournament.
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Phase-based rehabilitation with objective criteria, not calendar alone:
- Days 0–2: relative rest, protected weight-bearing, compression, elevation, early pain-free range of motion; avoid prolonged immobilization. NSAIDs for pain (short course). Early isometric strengthening.
- Days 2–5: progressive therapeutic exercise - ankle ROM, peroneal and calf strengthening, balance/proprioceptive training (single-leg stance, wobble board), begin light jogging in a straight line if pain-free.
- Days 5–8: sport-specific drills - cutting, lateral movement, jumping/landing, change of direction; functional testing (single-leg hop, side hop, agility T-test) compared to the uninjured side.
- Days 8–10: full practice, then game clearance if criteria met.
Return-to-play criteria (all must be met):
- No pain with walking, jogging, cutting, or jumping.
- Full symmetric ROM and strength (within ~10% of contralateral).
- Functional tests symmetric (hop tests, balance).
- Confidence/psychological readiness.
Reasons to withhold clearance: persistent instability or giving-way, pain with sport-specific loading, inability to complete functional testing, or evidence of high ankle (syndesmotic) involvement - that typically requires 4–6+ weeks.
Given two prior sprains, add a prevention program (balance training, peroneal strengthening, possibly bracing/taping) - this reduces recurrence. He can likely play, but the decision is criteria-based, not date-based.