Epidemiology & Mechanism
Feature | Tibial Eminence Fractures | Tibial Tubercle Fractures |
Age group | ~ 8–14 years (mid‐childhood / early adolescence) | Adolescents, often near skeletal maturity |
Sex predilection | Slight male predominance | Much more common in males |
Typical mechanism | Sports injury, hyperextension or twisting; anterior cruciate ligament (ACL) avulsion equivalent | Forceful quadriceps contraction (e.g. jumping, sprinting), sudden extension under load |
Clinical Presentation
• Hemarthrosis, pain, swelling in knee region
• Tenderness localized to tibial eminence / tubercle
• Extension lag or inability to fully extend knee (especially in eminence fractures if “block”)
• Difficulty walking/weight bearing (more so in tubercle avulsions)
Imaging
• Plain Radiographs: AP + lateral knee. Lateral view critical for displacement and fragment relation.
• MRI: for eminence fractures—to assess entrapped meniscus, ACL status; also helpful in tubercle injuries to see growth plate (physis) involvement.
• CT: when intra‐articular extension or comminution of tubercle fragment, or when radiograph doesn’t clearly show the fragment orientation.
Classification
Tibial Eminence Fractures – Meyers & McKeever Classification
Type | Description |
Type I | Nondisplaced (minimal or no elevation) |
Type II | Partially displaced, with intact posterior hinge |
Type III | Completely displaced fragment |
Type IV (Zaricznyj) | Comminuted fragment |
Tibial Tubercle Fractures – Ogden Classification (Watson-Jones modification)
Type | Description |
Type I | Through secondary ossification center (tubercle tip) |
Type II | Into proximal tibial physis but tibial plateau not involved |
Type III | Intra-articular extension into knee joint / tibial plateau involvement (most common type) |
Type IV | Complete avulsion including tubercle and part of physis |
Type V | Periosteal sleeve avulsion or more complex variant |
Treatment Principles
Non-operative vs Operative Management
Injury Type / Displacement | Recommended Treatment |
Eminence Type I | Immobilization (knee in extension or slight flexion) for ~4–6 weeks + protected weight bearing |
Eminence Type II | Attempt closed reduction; if unsuccessful or mechanical block persists → surgical fixation (arthroscopic) |
Eminence Type III & IV | Surgical fixation (arthroscopic / open as needed) |
Tubercle Type I (nondisplaced) | Cast immobilization (extension) and gradual mobilization |
Tubercle Type II-V (displaced or intra-articular) | Open Reduction & Internal Fixation (ORIF) with screws, tension band, etc. |
Surgical Indications
• Displacement > ~2 mm, or any intra-articular step-off
• Mechanical block to knee extension (eminence)
• Closed reduction attempts that fail (eminence Type II)
• Open fractures
• Associated compartment syndrome risk (tubercle)
• Physeal involvement that risks growth plate damage
Complications (Short- and long-term)
• Arthrofibrosis – especially in eminence fractures if immobilization too long or inadequate rehabilitation
• Residual laxity (ACL function compromised or healing suboptimal)
• Growth disturbances (rare but possible in tubercle fractures when physis involved)
• Compartment syndrome – particularly relevant in acute tubercle avulsions
• Prominent tubercle / bursitis or cosmetic deformity
Prognosis
• With proper treatment, most eminence and tubercle fractures heal well, with return to pre-injury activity.
• Delay in reduction / fixation, or inadequate rehabilitation, increases risk of stiffness, limited extension.
• Physeal involvement or complications (growth arrest, deformity) more likely in tubercle fractures if mismanaged.
Key Takeaways (Spot Facts)
• Eminence fractures are pediatric ACL‐avulsion equivalents; mechanical block & meniscal entrapment must be sought.
• Tubercle fractures occur near skeletal maturity, risk of compartment syndrome must be considered.
• Displacement, intra-articular extension, physis involvement are red flags → favor surgical treatment.
• Early mobilization (once stable) is critical to prevent stiffness.
References
1. Meyers MH, McKeever FM. Fracture of the intercondylar eminence of the tibia. J Bone Joint Surg Am. 1959;41(2):209-222.
2. Ogden JA, Tross RB, Murphy MJ. Fractures of the tibial tuberosity in adolescents. J Bone Joint Surg Am. 1980;62(2):205-215.
3. Kocher MS, Micheli LJ, et al. Tibial eminence fractures in children: prevalence of meniscal entrapment. J Pediatr Orthop. The American journal of sports medicine, 31(3), 404–407. https://doi.org/10.1177/03635465030310031301