Proximal Tibia Fracture

The goal of this clinical trial is to learn more about anterior leg compartment pressures in adolescents who have sustained tibia fractures. It will also examine whether measuring anterior compartment pressure helps physicians diagnose acute compartment syndrome (ACS), a rare but dangerous complication that can develop following surgical treatment of a tibia fracture. The main questions it aims to answer are: 1. Are there differences in anterior compartment pressures between healthy patients and patients who develop ACS? 2. Does compartment pressure monitoring aid physicians in accurately diagnosing ACS? Participants will have a continuous pressure monitoring sensor placed in their knee anterior knee compartment during their surgery. This sensor will record pressure data following a patient's surgical treatment for 18+ hours.

In approx. 10-15% of all fracture patients, there is a prolonged healing time or even a complete absence of fracture healing (non-union). As a result, these patients require further surgical interventions, combined with renewed or prolonged hospitalisation/rehabilitation and incapacity to work. To summarise, this therefore represents a serious socio-economic problem. At present, there is no prognostic method for the early prediction of patients at risk of a disturbed healing process. However, if these patients are successfully stratified, there are already a variety of therapeutic strategies available to additionally stimulate fracture healing. Therefore, the aim is to conduct a prospective clinical study to validate CD8+ TEMRA cells as a prognostic marker of impaired fracture healing. The investigators assume that preoperative CD8+ TEMRA cell expression represents a prognostic biomarker with high diagnostic precision for differentiating between a) normal healing patients, b) delayed healing patients and c) pseudarthrosis patients. Furthermore, the sensitivity and specificity should be high enough, health-economically significant and realisable in clinical routine.