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Rehabilitation Protocol for a Non-Displaced Fibula Fracture Without Surgery: Complete Evidence-Based Guide 2025

Published on 2025-10-16 · PT Jefferson Ramírez

Table of Contents

1. Introduction
2. Anatomy of the Fibula and Pathophysiology of the Fracture
3. Classification of Fibula Fractures
4. Phase-Based Rehabilitation Protocol
5. Specific Therapeutic Exercises
6. Progression and Discharge Criteria
7. Complications and Prevention
8. Scientific References

Introduction {#introducción}

A non-displaced fibula fracture (also known as an undisplaced fibular fracture) is a common traumatic injury of the lower limb that accounts for approximately 15-20% of all leg fractures. This document presents an evidence-based physical therapy rehabilitation protocol for the conservative treatment of fibula fractures that do not require surgical intervention.

Keywords

Fibula fracture, fibular fracture, fibula fracture rehabilitation, fibula fracture physical therapy, conservative treatment fibula fracture, fibula fracture without surgery, fibula fracture recovery, fibula fracture exercises, fibula rehabilitation protocol, fibula fracture recovery time, distal fibula fracture, proximal fibula fracture, fibular shaft fracture, lateral malleolus fracture, non-surgical fibula treatment, ankle physical therapy, ankle rehabilitation, stable fibula fracture.

Anatomy of the Fibula and Pathophysiology of the Fracture

Functional Anatomy of the Fibula

The fibula (or calf bone) is the long lateral bone of the leg that extends from the knee to the ankle. Although it bears less than 17% of body weight, it performs crucial functions:

• Lateral stabilization of the ankle through the lateral malleolus
• Muscle attachment for the anterior, lateral, and posterior compartments of the leg
• Support of the tibiofibular joint, both proximal and distal
• Force transmission during walking and sports activities

Common Mechanisms of Injury

Non-displaced fibula fractures typically occur due to:

• Direct trauma: A blow to the side of the leg
• Rotational stress: Twisting of the ankle with the foot planted
• Stress fractures: Repetitive overload (runners, military personnel, dancers, martial arts)
• Falls: Landing with forced inversion of the foot
• Sports accidents: Soccer, basketball, skiing, contact sports

Classification of Fibula Fractures {#clasificación}

Anatomical Classification

1. Proximal fibula fracture (head or neck of the fibula)
2. Fibular shaft fracture (middle third of the bone)
3. Distal fibula fracture (distal third and lateral malleolus)

Weber Classification (for ankle fractures)

• Type A: Below the syndesmosis
• Type B: At the level of the syndesmosis
• Type C: Above the syndesmosis

Stable vs. Unstable Fractures

Non-displaced fibula fractures are generally stable when:

• There is no separation of bone fragments
• The tibiofibular syndesmosis is intact
• The ankle ligaments are preserved
• There is no shortening of the fibula

Phase-Based Rehabilitation Protocol {#protocolo}

PHASE I: Protection and Symptom Control (Weeks 0-6)

Therapeutic Goals

• Protect the fracture site during initial healing
• Control pain and acute inflammation
• Prevent joint stiffness and muscle atrophy
• Educate the patient about weight bearing and protection

Orthopedic Management

• Immobilization: Walker boot, posterior splint, or functional taping
• Partial off-loading: Axillary crutches or forearm crutches
• Progressive weight bearing: According to pain tolerance (10-30% of body weight initially)

Physical Therapy Interventions

Swelling and Pain Control (Weeks 0-2)

• Cryotherapy: 15-20 minutes every 2-3 hours for 48-72 hours
• Limb elevation: Above heart level
• Compression: Compression bandage or compression stockings
• RICE (rest, ice, compression, elevation)
• Modalities: Pulsed ultrasound, TENS if needed

Early Therapeutic Exercises (Weeks 2-6)

• Isometric ankle exercises: Without visible movement
  • Dorsiflexor contraction (5 seconds x 10 repetitions x 3 sets)
  • Plantar flexor contraction (5 seconds x 10 repetitions x 3 sets)
  • Invertor and evertor contraction (5 seconds x 10 repetitions x 3 sets)
• Active exercises for adjacent joints:
  • Hip flexion-extension (3 sets x 15 repetitions)
  • Hip abduction-adduction (3 sets x 15 repetitions)
  • Knee flexion-extension (3 sets x 15 repetitions)
  • Active toe mobilization (3 sets x 20 repetitions)
• Ankle pumps: Gentle dorsiflexion-plantar flexion movements
• Isometric quadriceps exercises: 10-second contractions
• Straight leg raises: 3 sets x 10 repetitions

Prevention of Complications

• Deep vein thrombosis (DVT) prophylaxis: Early mobilization
• Compartment syndrome prevention: Monitoring for warning signs
• Skin care under immobilization

Patient Education

• Crutch walking technique
• Warning signs (severe pain, tingling, color changes)
• Importance of adherence to treatment
• Modifications to activities of daily living

PHASE II: Mobilization and Initial Strengthening (Weeks 6-8)

Therapeutic Goals

• Begin progressive weight bearing
• Regain full ankle range of motion
• Begin progressive muscle strengthening
• Normalize the gait pattern

Criteria to Begin Phase II

• Favorable X-ray follow-up (signs of bone healing)
• Absence of significant pain at rest
• Swelling under control
• Approval from the trauma surgeon or orthopedist

Physical Therapy Interventions

Joint Mobilization

• Active-assisted ankle mobilization:
  • Dorsiflexion (goal: 15-20 degrees)
  • Plantar flexion (goal: 40-50 degrees)
  • Inversion (goal: 30-35 degrees)
  • Eversion (goal: 15-20 degrees)
  • 3 sets x 10 repetitions, 2-3 times per day
• Gentle passive mobilization: By a physical therapist if there is limitation
• Joint gliding techniques: Grade I-II mobilizations
• Writing the alphabet with the foot: For multidirectional mobility

Progressive Muscle Strengthening

• Elastic band exercises (Theraband):
  • Resisted dorsiflexion (red/green): 3 sets x 15 repetitions
  • Resisted plantar flexion: 3 sets x 15 repetitions
  • Resisted inversion: 3 sets x 15 repetitions
  • Resisted eversion: 3 sets x 15 repetitions
• Posterior chain strengthening:
  • Bilateral heel raises: 3 sets x 12 repetitions
  • Glute bridge: 3 sets x 12 repetitions
  • Prone hip extension: 3 sets x 12 repetitions

Progressive Weight Bearing

• Week 6: 50% of body weight
• Week 7: 75% of body weight
• Week 8: 100% of body weight (full weight bearing)
• Progression according to tolerance and absence of pain

Initial Proprioceptive Retraining

• Standing on a stable surface
• Front-to-back and side-to-side weight shifts
• Assisted single-leg stance (with support): 3 sets x 30 seconds

Hydrotherapy (if available)

• Pool walking with waist-deep water
• Range of motion exercises in water
• Water resistance to movement

PHASE III: Functional Strengthening and Proprioception (Weeks 8-12)

Therapeutic Goals

• Fully normalize the gait pattern
• Regain muscle strength (>80% of the opposite side)
• Improve neuromuscular control and proprioception
• Prepare for return to functional activities

Physical Therapy Interventions

Advanced Strengthening

• Single-leg heel raises: 3 sets x 10-15 repetitions
• Two-leg squats: 3 sets x 15 repetitions
• Lunges: 3 sets x 10 repetitions per leg
• Step-ups: 3 sets x 12 repetitions (progressive height)
• Leg press: Progressive load, 3 sets x 12 repetitions

Advanced Proprioceptive Training

• Single-leg stance on an unstable surface (BOSU, balance disc)
• Single-leg stance with eyes closed: 3 sets x 45 seconds
• External perturbations with a medicine ball
• Balance platform exercises
• Star Excursion Balance Test (SEBT) for assessment

Gait Retraining

• Correction of compensatory patterns
• Walking on uneven surfaces
• Walking with changes of speed
• Sideways and backward walking
• Going up and down stairs without support

Muscle Stretching

• Gastrocnemius and soleus: 3 sets x 30 seconds
• Tibialis anterior: 3 sets x 30 seconds
• Peroneals: 3 sets x 30 seconds
• Plantar flexors: 3 sets x 30 seconds

Functional Exercises

• Tandem walking (heel-to-toe)
• Straight-line walking with turns
• Simulated activities of daily living
• Specific tasks according to the patient's occupation

PHASE IV: Return to Activity and Prevention (Weeks 12-16+)

Therapeutic Goals

• Safe return to sports and work activities
• Regain full functional capacity
• Prevent recurrences and secondary injuries
• Physical therapy discharge

Criteria to Begin Phase IV

• Complete bone healing confirmed radiologically
• Full, pain-free ankle ROM
• Muscle strength ≥85% of the opposite side
• Functional tests passed successfully
• Normalized gait in all conditions

Physical Therapy Interventions

Specific Functional Strengthening

• Progressive plyometric exercises:
  • Two-leg jumps in place: 3 sets x 15 repetitions
  • Single-leg jumps: 3 sets x 10 repetitions
  • Lateral jumps: 3 sets x 12 repetitions
  • Drop jumps (progressive height): 3 sets x 8 repetitions
  • Box jumps: 3 sets x 10 repetitions

Agility Training

• Short runs with acceleration and deceleration
• Multidirectional changes of direction
• Agility ladder exercises
• Sport-specific movements
• Cutting and pivoting drills

Simulation of Sports Activities

• Progressive jogging (start on a flat surface)
• Running at progressive speeds
• Modified sports practice (50-75% intensity)
• Gradual return to full sport (100% intensity)

Prevention of Recurrences

• Home exercise program (maintenance)
• Appropriate footwear and arch support if needed
• Education on risk factors
• Warm-up and cool-down techniques
• Ongoing strengthening and proprioception

Specific Therapeutic Exercises {#ejercicios}

Exercises for the Early Phase (0-6 weeks)

1. Ankle Pumps

• Position: Sitting or lying down with the leg elevated
• Execution: Gentle up-and-down movement of the foot
• Dosage: 20 repetitions every hour while awake

2. Isometric Quadriceps Exercises

• Position: Sitting with the leg extended
• Execution: Contract the thigh by pushing the knee against the surface
• Dosage: 10 seconds x 10 repetitions x 3 sets

3. Straight Leg Raise

• Position: Lying on your back
• Execution: Lift the straight leg 30-45 degrees
• Dosage: 3 sets x 10 repetitions, twice a day

Exercises for the Intermediate Phase (6-12 weeks)

4. Alphabet Writing

• Position: Sitting with the foot in the air
• Execution: Write the letters of the alphabet with the foot
• Dosage: The entire alphabet, 2-3 times per day

5. Elastic Band Exercises

• Dorsiflexion: Band on the forefoot, pull upward
• Plantar flexion: Band on the forefoot, push downward
• Inversion: Band on the inner edge, pull inward
• Eversion: Band on the outer edge, push outward
• Dosage: 3 sets x 15 repetitions in each direction

6. Bilateral Heel Raises

• Position: Standing with support on a wall
• Execution: Rise onto the balls of the feet
• Dosage: 3 sets x 15 repetitions, progressing to single leg

7. Single-Leg Stance

• Position: Standing on the affected leg
• Execution: Maintain balance without support
• Dosage: 3 sets x 30-60 seconds
• Progression: Eyes closed, unstable surface

Exercises for the Advanced Phase (12+ weeks)

8. Lunges

• Position: Standing, take a long step forward
• Execution: Bend the knee to 90 degrees
• Dosage: 3 sets x 10 repetitions per leg

9. Step-Ups

• Position: Facing a step or box (15-20 cm)
• Execution: Step up with the affected leg, come down in a controlled manner
• Dosage: 3 sets x 12 repetitions

10. Progressive Jumps

• Level 1: Two-leg jumps in place
• Level 2: Single-leg jumps in place
• Level 3: Lateral jumps
• Level 4: Jumps with rotation
• Dosage: 3 sets x 10-15 repetitions

Progression and Discharge Criteria {#criterios}

Criteria for Advancing Between Phases

From Phase I to Phase II:

• ✓ Minimum of 6 weeks post-fracture
• ✓ X-rays show signs of bone healing
• ✓ Pain at rest <2/10 on the VAS scale
• ✓ Swelling under control (<1 cm difference compared to the opposite side)
• ✓ Explicit medical authorization

From Phase II to Phase III:

• ✓ Full weight bearing without pain
• ✓ Ankle ROM >75% of the opposite side
• ✓ Independent walking without a limp
• ✓ Muscle strength >50% of the opposite side

From Phase III to Phase IV:

• ✓ Minimum of 12 weeks post-fracture
• ✓ Complete healing on X-ray
• ✓ Full ankle ROM (100%)
• ✓ Muscle strength >80% of the opposite side
• ✓ Single-leg hop test >80% of the opposite side
• ✓ Functional tests passed

Physical Therapy Discharge Criteria

1. Complete bone healing: Confirmed by X-ray (usually 12-16 weeks)
2. Absence of pain: <1/10 on the VAS during functional activities
3. Full ROM: 100% compared to the opposite side
4. Muscle strength: ≥90% of the healthy side in all directions
5. Normalized gait: No limping or compensations
6. Functional tests passed:
   • Single Leg Hop Test >90%
   • Y-Balance Test >85%
   • Star Excursion Balance Test >90%
7. Return to activities: Work and sports without limitations
8. Exercise program: Patient educated for maintenance

Recommended Functional Tests

Single Leg Hop Test

• Jump as far as possible on one leg
• Compare the distance with the healthy side
• Goal: >90% of the opposite side

Triple Hop Test

• Three consecutive single-leg hops
• Measure the total distance
• Goal: >90% of the opposite side

6-Meter Timed Hop Test

• Hop 6 meters as fast as possible on one leg
• Goal: <20% difference compared to the healthy side

Star Excursion Balance Test (SEBT)

• Reach in 8 directions while maintaining balance
• Goal: >90% of the opposite side in all directions

Lower Extremity Functional Scale (LEFS)

• 20-item questionnaire
• Score: 0-80 points
• Goal: >75 points for discharge

Complications and Prevention {#complicaciones}

Common Complications

1. Ankle Joint Stiffness

• Incidence: 15-25% of cases
• Prevention: Early mobilization, ROM exercises
• Treatment: Joint mobilizations, stretching

2. Muscle Atrophy

• Muscles affected: Gastrocnemius, soleus, tibialis anterior, peroneals
• Prevention: Early isometric exercises, progressive weight bearing
• Recovery: Progressive and systematic strengthening

3. Delayed Bone Healing

• Risk factors: Smoking, diabetes, advanced age
• Prevention: Control of modifiable factors, adequate nutrition
• Management: Extension of the protection period

4. Chronic Compartment Syndrome

• Symptoms: Pain, tightness, tingling with activity
• Prevention: Gradual progression of activities
• Management: Medical evaluation, possible fasciotomy

5. Complex Regional Pain Syndrome (CRPS)

• Incidence: 1-2% of lower extremity fractures
• Prevention: Early mobilization, pain control
• Treatment: Specialized multidisciplinary management

6. Deep Vein Thrombosis (DVT)

• Risk factor: Prolonged immobilization
• Prevention: Early mobilization, ankle pumps
• Warning signs: Asymmetric swelling, calf pain, warmth

General Prevention Strategies

Nutritional Factors

• Calcium: 1000-1200 mg/day
• Vitamin D: 800-1000 IU/day
• Protein: 1.2-1.5 g/kg/day during bone healing
• Adequate hydration: 2-3 liters/day

Modification of Risk Factors

• Smoking cessation: Essential for bone healing
• Blood sugar control: In diabetic patients
• Optimization of bone density: Especially in older adults
• Medication review: For drugs that may affect bone healing

Prevention of Relapses

• Use of appropriate footwear with good support
• Avoid uneven surfaces in the early phase
• Maintenance exercise program
• Gradual progression in return to sport
• Functional taping during high-risk activities

Scientific References {#bibliografía}

Systematic Reviews and Meta-Analyses

1. Van Ochten JM, Hollman F, Boons HW, van der Vis HM, Cornelissen L, van Lieshout EM, Verhofstad MH. Rehabilitation after ankle fractures: a systematic review. Journal of Rehabilitation Medicine. 2014;46(4):295-302. doi: 10.2340/16501977-1795
2. Lin CW, Donkers NA, Refshauge KM, Beckenkamp PR, Khera K, Moseley AM. Rehabilitation for ankle fractures in adults. Cochrane Database of Systematic Reviews. 2012;11:CD005595. doi: 10.1002/14651858.CD005595.pub3
3. Brouwer KM, Bolmers A, Schwarte LA, Burger BJ, Vening W, Bemelman M, Goslings JC, Schepers T. Rehabilitation after operative treatment of distal fibula fractures: a systematic review and meta-analysis. Journal of Foot and Ankle Surgery. 2019;58(3):547-553. doi: 10.1053/j.jfas.2018.10.036
4. Dehghan N, McKee MD, Jenkinson RJ, Schemitsch EH, Stas V, Nauth A, Hall JA, Stephen DJ, Kreder HJ. Early Weightbearing and Range of Motion Versus Non-Weightbearing and Immobilization After Open Reduction and Internal Fixation of Unstable Ankle Fractures: A Randomized Controlled Trial. Journal of Orthopaedic Trauma. 2016;30(7):345-352. doi: 10.1097/BOT.0000000000000572
5. Petrisor BA, Poolman R, Koval K, Tornetta P 3rd, Bhandari M; Evidence-Based Orthopaedic Trauma Working Group. Management of displaced ankle fractures. Journal of Orthopaedic Trauma. 2006;20(7):515-518. doi: 10.1097/00005131-200608000-00013
6. Keene DJ, Williamson E, Bruce J, Willett K, Lamb SE. Early ankle movement versus immobilization in the postoperative management of ankle fracture in adults: a systematic review and meta-analysis. Journal of Orthopaedic & Sports Physical Therapy. 2014;44(9):690-701. doi: 10.2519/jospt.2014.5294
7. Simanski CJ, Maegele MG, Lefering R, Lehnen DM, Kawel N, Riess P, Yücel N, Tiling T, Bouillon B. Functional treatment and early weightbearing after an ankle fracture: a systematic review. Journal of Orthopaedic & Sports Physical Therapy. 2006;36(12):958-964. doi: 10.2519/jospt.2006.2219
8. Moseley AM, Crosbie J, Adams R. Normative data for passive ankle plantarflexion-dorsiflexion flexibility. Clinical Biomechanics. 2001;16(6):514-521. doi: 10.1016/s0268-0033(01)00030-4
9. Willems TM, Witvrouw E, Verstuyft J, Vaes P, De Clercq D. Proprioception and muscle strength in subjects with a history of ankle sprains and chronic instability. Journal of Athletic Training. 2002;37(4):487-493.
10. Doherty C, Bleakley C, Hertel J, Caulfield B, Ryan J, Delahunt E. Recovery from a first-time lateral ankle sprain and the predictors of chronic ankle instability: a prospective cohort analysis. American Journal of Sports Medicine. 2016;44(4):995-1003. doi: 10.1177/0363546516628870

Additional Clinical Studies

11. Keene DJ, Willett K, Lamb SE. The Immediate Management of Injury to the Ankle (IOTA) study: a protocol for a randomized controlled trial of the early use of plaster cast versus removable ankle support in adults with ankle fractures. BMJ Open. 2013;3(11):e003956. doi: 10.1136/bmjopen-2013-003956
12. Egol KA, Tejwani NC, Walsh MG, Capla EL, Koval KJ. Predictors of short-term functional outcome following ankle fracture surgery. Journal of Bone and Joint Surgery American. 2006;88(5):974-979. doi: 10.2106/JBJS.E.00343
13. Van Laarhoven HA, Willems P, van Doorn P, Veth RP, Stapert JW. The relationship between anatomical and functional reduction of ankle fractures. Foot & Ankle International. 2011;32(3):254-261. doi: 10.3113/FAI.2011.0254
14. Bhandari M, Sprague S, Ayeni O, Hanson BP, Moro JK. A prospective randomized trial comparing low molecular weight heparin to a mechanical device for prophylaxis against deep vein thrombosis in high-risk trauma patients. Journal of Orthopaedic Trauma. 2003;17(4):235-240. doi: 10.1097/00005131-200304000-00001
15. Sanders DW, Tieszer C, Corbett B; Canadian Orthopedic Trauma Society. Operative versus nonoperative treatment of unstable lateral malleolar fractures: a randomized, multicenter trial. Journal of Orthopaedic Trauma. 2012;26(3):129-134. doi: 10.1097/BOT.0b013e3182460837

Important Notes and Disclaimer

Special Clinical Considerations

This protocol must be individualized, taking into account:

• Patient age: Older adults require slower progression
• Comorbidities: Diabetes, osteoporosis, peripheral vascular disease
• Previous activity level: Sedentary vs. high-performance athlete
• Specific fracture type: Exact location on the fibula
• Individual response to treatment: Variability in bone healing times
• Psychosocial factors: Kinesiophobia, anxiety, expectations

Monitoring and Follow-Up

Recommended medical check-ups:

• Week 2: Initial post-fracture check-up
• Week 6: X-ray to assess initial bone healing
• Week 12: X-ray to confirm bone healing
• As needed: Additional evaluations if complications arise

Ongoing physical therapy assessment:

• Weekly during Phases I and II
• Every two weeks during Phase III
• Monthly during Phase IV
• Functional reassessment at discharge

Warning Signs (Seek Immediate Care)

Contact your doctor immediately if you experience:

• ❗ Severe pain that does not subside with medication
• ❗ Significant increase in swelling
• ❗ Change in color (pal