Osteochondral Fracture of the Talus: Clinical Presentation, Diagnostic Evaluation, Management, and Outcomes – A Case Report

Abstract

Osteochondral fractures of the talus are relatively uncommon but clinically significant injuries involving damage to the articular cartilage and underlying subchondral bone. These lesions are most often associated with ankle trauma, particularly inversion injuries, and can lead to chronic pain, instability, and early osteoarthritis if not appropriately managed.

We report the case of a 28-year-old male who presented with persistent ankle pain and swelling following a sports-related injury. Imaging studies, including MRI, revealed an osteochondral fracture of the talar dome. The patient was treated with arthroscopic debridement and microfracture, followed by structured rehabilitation, resulting in favorable functional recovery.

This case highlights the importance of early recognition, appropriate imaging, and individualized management strategies in optimizing outcomes for osteochondral lesions of the talus.

Introduction

Osteochondral fractures of the talus, often referred to as osteochondral lesions of the talus (OLT), involve injury to both the cartilage and the underlying subchondral bone of the talar dome. These injuries are frequently overlooked in the acute setting, particularly when initial radiographs appear normal.

The talus plays a critical role in ankle biomechanics, transmitting forces between the leg and foot. Due to its limited vascular supply and high load-bearing function, injuries to the talus can have significant long-term consequences.

Osteochondral lesions are most commonly caused by trauma, particularly ankle sprains involving inversion or dorsiflexion. Medial lesions are typically deeper and associated with inversion and plantarflexion injuries, whereas lateral lesions tend to be more superficial and result from inversion and dorsiflexion mechanisms.

Risk factors include:

• Acute ankle trauma (sports injuries, falls)
• Recurrent ankle sprains
• High-impact athletic activities
• Delayed or missed diagnosis of ankle injuries

Clinically, patients may present with persistent ankle pain, swelling, stiffness, and mechanical symptoms such as locking or catching.

Case Report

Patient History

A 28-year-old male presented to the orthopedic outpatient department with complaints of:

• Persistent pain in the right ankle for 3 months
• Swelling aggravated by activity
• Difficulty in weight-bearing and running
• Occasional locking sensation in the ankle joint

The patient reported a history of a twisting injury to the ankle while playing football 3 months prior. He was initially managed conservatively with rest and analgesics, but symptoms persisted.

There was no history of previous ankle injuries, systemic illness, or inflammatory joint disease.

Clinical Examination

On general examination:

• Patient was afebrile
• Vital signs were stable
• No systemic abnormalities were noted

Local examination of the right ankle revealed:

• Mild swelling over the anterolateral aspect
• Tenderness over the talar dome region
• Pain on dorsiflexion and inversion
• Reduced range of motion compared to the contralateral ankle
• No gross instability on ligament testing

There were no signs of neurovascular compromise.

Clinical Evaluation

Differential Diagnosis

Based on clinical presentation, the following conditions were considered:

• Osteochondral fracture of the talus
• Chronic ankle sprain
• Synovitis of the ankle joint
• Talar dome contusion
• Early osteoarthritis

Persistent symptoms following an ankle injury raised suspicion for an osteochondral lesion.

Investigations

Radiological Findings

Plain Radiography:

• Initial X-rays were inconclusive, showing no obvious fracture

Magnetic Resonance Imaging (MRI):

• Revealed an osteochondral lesion over the lateral talar dome
• Evidence of cartilage defect with subchondral bone involvement
• Bone marrow edema surrounding the lesion
• No loose bodies identified

MRI played a crucial role in confirming the diagnosis and assessing lesion stability.

Diagnosis

Based on clinical findings and MRI imaging, a diagnosis of osteochondral fracture of the lateral talar dome was established.

Management and Outcome

Management Strategy

The treatment approach was individualized based on:

• Size and location of the lesion
• Symptom duration
• Functional impairment

Given the persistent symptoms and imaging findings, surgical intervention was planned.

Surgical Management

The patient underwent ankle arthroscopy, which revealed:

• A focal osteochondral defect over the lateral talar dome

• Softened cartilage with partial detachment

Procedures performed:

• Arthroscopic debridement of unstable cartilage
• Microfracture technique to stimulate fibrocartilage formation

The procedure was uneventful.

Postoperative Care

Postoperative management included:

• Non-weight-bearing for 4 weeks
• Gradual progression to partial and then full weight-bearing
• Physiotherapy focusing on:
  • Range of motion exercises
  • Strengthening of peri-ankle muscles
  • Proprioceptive training

Follow-Up and Outcome

At 6 weeks:

• Reduction in pain
• Improved range of motion

At 3 months:

• Significant functional improvement
• Ability to bear weight without discomfort
• No mechanical symptoms

At 6 months:

• Return to moderate physical activity
• No recurrence of swelling or locking
• Improved ankle stability

The patient demonstrated excellent compliance with rehabilitation and achieved a favorable outcome.

Discussion

Pathophysiology

Osteochondral fractures of the talus occur due to shear and compressive forces acting on the articular surface during trauma. The injury results in:

• Disruption of cartilage integrity
• Damage to subchondral bone
• Potential formation of loose fragments

The talus has a relatively poor blood supply, which limits healing potential and increases the risk of chronic lesions.

Classification

Osteochondral lesions are commonly classified based on imaging findings:

• Stable vs unstable lesions
• Displaced vs non-displaced fragments

MRI-based classifications help guide treatment decisions.

Diagnostic Challenges

Diagnosis can be challenging due to:

• Normal initial radiographs
• Overlap with simple ankle sprains
• Delayed presentation of symptoms

MRI is the gold standard for detecting early lesions and assessing cartilage integrity.

Treatment Considerations

Management depends on lesion characteristics and symptom severity.

Conservative Management:

• Indicated for small, stable lesions
• Includes rest, immobilization, and physiotherapy

Surgical Management:

• Indicated for:
  • Persistent symptoms
  • Large or unstable lesions
  • Failure of conservative therapy

Surgical options include:

• Arthroscopic debridement
• Microfracture
• Osteochondral autograft transplantation
• Autologous chondrocyte implantation

Complications

If untreated or inadequately managed, osteochondral fractures may lead to:

• Chronic ankle pain
• Joint instability
• Osteoarthritis
• Reduced functional capacity

Post-surgical complications may include:

• Incomplete healing
• Fibrocartilage degeneration
• Recurrence of symptoms

Prognosis

The prognosis depends on:

• Size and location of the lesion
• Timeliness of diagnosis
• Type of treatment
• Patient adherence to rehabilitation

Early intervention generally leads to better outcomes. Microfracture techniques are effective for small to medium-sized lesions, though long-term durability may vary.

Conclusion

Osteochondral fractures of the talus are important yet often underdiagnosed injuries following ankle trauma. This case emphasizes the need for a high index of suspicion in patients with persistent ankle symptoms despite initial conservative management.

MRI plays a critical role in diagnosis, while arthroscopic management offers effective treatment for symptomatic lesions. A multidisciplinary approach involving orthopedic surgeons and physiotherapists is essential for optimal recovery.

Timely diagnosis and appropriate intervention can significantly improve functional outcomes and prevent long-term complications such as osteoarthritis. Increased awareness among clinicians is key to ensuring early detection and effective management of this condition.

References

1. Berndt, A. L., & Harty, M. (1959). Transchondral fractures (osteochondritis dissecans) of the talus. The Journal of Bone and Joint Surgery. American Volume. https://pubmed.ncbi.nlm.nih.gov/13849029/
2. Verhagen, R. A. W., Struijs, P. A. A., Bossuyt, P. M. M., & van Dijk, C. N. (2003). Systematic review of treatment strategies for osteochondral defects of the talar dome. Foot and Ankle Clinics, 8(2), 233–242. https://pubmed.ncbi.nlm.nih.gov/12911238/
3. Tol, J. L., Struijs, P. A. A., Bossuyt, P. M. M., Verhagen, R. A. W., & van Dijk, C. N. (2000). Treatment strategies in osteochondral defects of the talar dome: A systematic review. Foot & Ankle International, 21(2), 119–126. https://pubmed.ncbi.nlm.nih.gov/10694023/
4. Schuman, L., Struijs, P. A. A., & van Dijk, C. N. (2002). Arthroscopic treatment for osteochondral defects of the talus. Results at follow-up at 2 to 11 years. The Journal of Bone and Joint Surgery. British Volume, 84(3), 364–368. https://pubmed.ncbi.nlm.nih.gov/12002494/
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