Overview
Closed fracture of the bone around the knee joint is a significant orthopedic injury characterized by bone disruption without open wounds. This condition often results from high-energy trauma such as falls, motor vehicle accidents, or sports injuries. It primarily affects individuals of all ages but is more prevalent in older adults due to osteoporosis and decreased bone density. Prompt and appropriate management is crucial to prevent complications such as joint stiffness, malunion, nonunion, and infection, which can severely impact mobility and quality of life. Effective treatment strategies are essential in day-to-day practice to ensure optimal recovery and functional outcomes 13.Pathophysiology
The pathophysiology of closed fractures around the knee involves complex interactions at the molecular, cellular, and structural levels. Trauma initiates immediate mechanical disruption of bone tissue, leading to microfractures and macrofractures depending on the force magnitude. This mechanical injury triggers an acute inflammatory response, characterized by the release of cytokines and chemokines that recruit inflammatory cells to the site of injury. These cells, including neutrophils and macrophages, work to clear debris and initiate the healing cascade 1.At the cellular level, osteoblasts and osteoclasts play pivotal roles in the healing process. Osteoclasts resorb damaged bone tissue, while osteoblasts begin the formation of new bone matrix. However, in complex fractures, particularly those involving the knee joint, the delicate balance between these processes can be disrupted by factors such as joint incongruity, malalignment, and compromised blood supply. These disruptions can lead to delayed union, nonunion, or malunion, significantly affecting joint function and stability 3.
Moreover, the proximity of the fracture to soft tissues and neurovascular structures increases the risk of complications like compartment syndrome, vascular injury, and nerve damage, further complicating the healing process and necessitating meticulous surgical and post-operative care 13.
Epidemiology
The incidence of closed fractures around the knee varies but is notably higher in elderly populations due to increased fragility fractures and in younger individuals involved in high-impact activities. Studies suggest that the prevalence is approximately 5-10 cases per 100,000 individuals annually, with a slight male predominance, likely due to higher engagement in riskier activities. Geographic variations exist, with urban areas reporting slightly higher incidences due to increased vehicular traffic and occupational hazards. Risk factors include osteoporosis, previous joint pathology, and significant trauma. Over time, there has been a trend towards increased incidence secondary to aging populations and rising rates of high-impact sports injuries 13.Clinical Presentation
Patients with closed fractures around the knee typically present with acute pain, swelling, and deformity at the site of injury. Common symptoms include inability to bear weight, crepitus (grating sensation), and limited range of motion. Red-flag features that warrant immediate attention include severe pain disproportionate to the injury, significant deformity, open wounds developing post-injury, signs of neurovascular compromise (pale, cold, or numb extremities), and systemic symptoms like fever, which may indicate infection. Prompt recognition of these signs is crucial for timely intervention and to prevent complications 13.Diagnosis
The diagnostic approach for closed fractures around the knee involves a combination of clinical assessment and imaging techniques. Initially, a thorough history and physical examination are conducted to assess the extent of injury and identify any red-flag features. Radiographic evaluation, primarily using X-rays, is essential for confirming the fracture type, location, and displacement. Advanced imaging such as CT scans and MRI may be necessary in complex fractures to better delineate bone and soft tissue injuries, especially when planning surgical interventions 13.Diagnostic Criteria and Tests:
Management
Initial Management
Surgical Intervention
Post-Operative Care
Contraindications
Complications
Prognosis & Follow-up
The prognosis for closed fractures around the knee varies based on the severity of the injury, patient age, and adherence to treatment protocols. Favorable outcomes are more likely with early diagnosis, appropriate surgical intervention, and rigorous rehabilitation. Key prognostic indicators include initial fracture displacement, bone quality, and the presence of associated injuries. Recommended follow-up intervals typically include:Special Populations
Key Recommendations
References
1 Tang X, Shi W, Qian Y, Ge Z. Effect of suture closure and staple closure on postoperative wound complications in patients undergoing knee replacement surgery: A meta-analysis. International wound journal 2024. link 2 Hameed D, Springer BD, Malkani AL, Mont MA. The Role of a New Hinged Total Knee Arthroplasty System for Use in a Variety of Complex Knee Scenarios: A Case Series. Surgical technology international 2024. link 3 Kouyoumdjian P, Coulomb R, d'Ambrosio A, Ravoyard S, Cavaignac E, Pasquier G et al.. Hinged total knee arthroplasty for fracture cases: Retrospective study of 52 patients with a mean follow-up of 5 years. Orthopaedics & traumatology, surgery & research : OTSR 2020. link 4 Rossi MD, Hasson S, Kohia M, Pineda E, Bryan W. Relationship of closed and open chain measures of strength with perceived physical function and mobility following unilateral total knee replacement. Journal of geriatric physical therapy (2001) 2007. link