Abstract: Objective To analyze the factors affecting the effect of postoperative joint function rehabilitation in patients with tibial plateau fracture combined with intercondylar spine fracture by Logistic regression analysis, and to establish a risk model prediction to further lay the foundation for postoperative knee joint function rehabilitation. 
Methods A total of 272 patients with tibial plateau fracture combined with intercondylar spine fracture were selected as the research subjects. The Knee Joint Score of the American Hospital of Special Surgery(HSS) was used to evaluate the postoperative knee function rehabilitation effect of the patients, and logistics regression analysis was used to analyze the influencing factors of postoperative joint function rehabilitation effect. A Logistic regression prediction model was established to further evaluate the sensitivity and specificity of this model to predict postoperative joint function rehabilitation effect. 
Results In 272 patients with tibial plateau fracture combined with intercondylar spine fracture, the postoperative knee function recovered well in 79.41%of patients, and the postoperative knee function recovered poorly in 20.59% of patients. The logistic regression analysis showed that age, body mass index(BMI), preoperative American Society of Anesthesiologists(ASA) grade, and duration of operation, osteoporosis, preoperative range of motion(ROM) of the knee joint, and postoperative pain were the influencing factors of postoperative joint function rehabilitation in patients with tibial plateau fracture combined with intercondylar spine fracture(P＜0.05). When Logistic(P) was >3.87, the predictive value was the highest, with a sensitivity of 67.9% and a specificity of 93.5%. 
Conclusion Affected by factors such as age, BMI, preoperative ASA grade, duration of operation, osteoporosis, preoperative ROM of the knee joint, and postoperative pain, patients with tibial plateau fracture combined within tercondylar spine fracture are at risk of poor recovery of knee joint function after surgery. In clinical practice,preventive interventions should be strengthened to improve the rehabilitation effect and prognosis.

Key words: tibial plateau, intercondylar spine, fracture, joint function, rehabilitation effect, risk model