OBJECTIVE: To summarize the research progress on knee laxity of biomechanics and prevention and treatment after posterior cruciate ligament (PCL) reconstruction. METHODS: The domestic and international literature on the prevention and treatment of knee laxity after PCL reconstruction in recent years was extensively reviewed and analyzed. RESULTS: Different degrees of knee laxity often occur after PCL reconstruction, which can lead to poor prognosis in patients. The causes are associated with a variety of factors, including abnormal graft remodeling (such as differences in healing time and biomechanics among different types of grafts), tunnel position deviation (such as graft wear caused by the "killer turn" effect), and mechanical factors in postoperative rehabilitation (such as improper early weight-bearing and range of motion). These factors may promote graft elongation, increase early posterior tibial translation, and thereby induce knee laxity. CONCLUSION While PCL reconstruction improves knee stability, it is crucial to focus on and prevent postoperative knee laxity. However, current surgical methods are limited by factors such as graft characteristics, surgical technique flaws, and rehabilitation protocols, and thus can not fully correct the issue of abnormal postoperative laxity. Surgical techniques and treatment strategies still need further improvement and optimization to enhance patients' postoperative outcomes and quality of life.
Humans ; Joint Instability/surgery* ; Posterior Cruciate Ligament Reconstruction/adverse effects* ; Posterior Cruciate Ligament/surgery* ; Knee Joint/physiopathology* ; Biomechanical Phenomena ; Range of Motion, Articular ; Postoperative Complications/prevention & control* ; Knee Injuries/surgery*

OBJECTIVE: To summarize research progress on enhanced recovery after posterior cruciate ligament (PCL) reconstruction, clarify the core contradictions, effective intervention methods, and evaluation shortcomings in current clinical practice, and provide theoretical support for optimizing clinical rehabilitation strategies. METHODS: Relevant domestic and international literature in recent years was systematically searched. The key technologies and challenges for enhanced recovery after PCL reconstruction were analyzed from three aspects: the core issues of enhanced recovery after PCL reconstruction, treatment strategies, and the post-reconstruction effectiveness evaluation system. RESULTS: Enhanced recovery after PCL reconstruction mainly faces two core problems. First, there is a balance dilemma between graft tendon protection and knee joint function recovery: the tensile capacity of the graft tendon is weak in the early postoperative period, so excessive weight-bearing easily leads to relaxation, while overly conservative immobilization causes muscle atrophy and joint adhesion. Second, the return-to-sport rate is significantly affected by injury type and treatment method: patients with combined multiple ligament or meniscus injuries have a much lower return-to-sport rate than those with isolated PCL injury, and the risk of return-to-sport failure is higher. Current research mainly promotes rehabilitation from two aspects: physical therapy and surgical technology. Physical therapy runs through the perioperative period: preoperatively, muscle strength training, swelling control, and maintenance of joint range of motion are used to optimize surgical conditions; postoperatively, phased intervention is implemented. Surgical technology focuses on minimally invasive and anatomical approaches: arthroscopic surgery reduces injury, double-bundle reconstruction and internal tension-relief technology improve stability, and modified tunnel positioning and special surgical methods avoid the risk of "Killer Turn". Postoperative functional evaluation adopts multi-dimensional indicators: subjective evaluation relies on scales such as Lysholm and International Knee Documentation Committee (IKDC); objective evaluation assesses stability through Telos stress test and posterior drawer test; imaging evaluation takes MRI as the core; psychological evaluation is assisted by the Tampa scale of kinesiophobia-11 (TSK-11). However, there are obvious shortcomings, such as the lack of PCL-specific evaluation tools. CONCLUSION Enhanced recovery after PCL reconstruction requires the integration of precise surgery, individualized rehabilitation, and comprehensive subjective and objective evaluation. In the future, biomaterials and digital technologies should be integrated to optimize the full-cycle management of PCL reconstruction, thereby improving functional recovery and the effect of return to sports.
Humans ; Posterior Cruciate Ligament Reconstruction/rehabilitation* ; Posterior Cruciate Ligament/injuries* ; Recovery of Function ; Knee Joint/physiopathology* ; Knee Injuries/rehabilitation* ; Return to Sport ; Enhanced Recovery After Surgery ; Tendons/transplantation* ; Arthroscopy

Objective:To evaluate the clinical effect of bispherical augment in acetabular defects reconstruction in hip revision.Methods:This is a retrospective case series study. A retrospective analysis of 119 patients (124 hips) patients who underwent hip revision surgery and reconstructed with bispherical augment for acetabular bone defects from January 2019 to December 2023 was performed. There were 57 males (58 hips) and 62 females (66 hips), aged (65.0±11.8) years (range:40 to 102 years). The body mass index was (23.9±3.5) kg/m 2 (range:16.1 to 32.2 kg/m 2). Acetabular bone defects were typed as follows: 2 hips in Paprosky type ⅡA, 29 hips in type ⅡB, 34 hips in type ⅡC, 31 hips in type ⅢA, and 28 hips in type ⅢB, of which 9 patients (9 hips) were combined with pelvic discontinuity. Differences in Harris hip score (HHS) and lower limb discrepancy (LLD) were compared between preoperatively and final follow-up. The height of the hip center of rotation and the horizontal distance from the center of rotation to the teardrop were measured by radiographs before and after surgery, and prothesis stability and the occurrence of postoperative complications were evaluated. Data were compared using the paired sample t test. Results:All patients successfully completed the operation. The operation time was (167.0±53.4) minutes (range:90 to 380 minutes) and the intraoperative bleeding was (345.3±124.2) ml (range:100 to 1 200 ml). The height of the hip center of rotation decreased from (39.7±13.0) mm preoperatively to (21.8±7.1) mm postoperatively and the horizontal distance from the center of rotation to the teardrop increased from (34.0±10.1) mm preoperatively to (38.5±5.9) mm postoperatively, and the differences were statistically significant ( t=15.859, P<0.01; t=5.266, P<0.01). All the patients were followed up for (26.1±15.4) months (range:6 to 60 months). At the last follow-up, HHS improved from (35.2±10.0) points preoperatively to (85.5±9.5) points, and the difference was statistically significant ( t=50.723, P<0.01). LLD decreased from (2.1±1.1) cm preoperatively to (0.5±0.5) cm, and the difference was statistically significant ( t=13.767, P<0.01). All acetabular components were stable and free of displacement on imaging during follow-up. Three patients suffered dislocation and received closed reduction, all prosthesis were in good position during follow-up. No dislocation, loosening, fracture, recurrence of infection and vascular nerve injury occurred in other patients. Conclusion:Bispherical augment can effectively reconstruct acetabular bone defects, restore the hip center of rotation, and improve hip joint function scores at short and mid-term follow-up.

Objective To explore the effect of periplaneta Americana extract CⅡ-3 on cell adhesion molecules level in para-cancerous liver tissue after transcatheter arterial embolization(TAE)for hepatocellular carcinoma(HCC)and its protective effect on liver injury.Methods Two tumor-loaded rabbits of Southeast University and 50 New Zealand white rabbits were used for this study.Laparotomy tumor granule injection method was adopted to establish rabbit VX 2 liver cancer models.Imaging examination was used to confirm the success of modeling and to assess the tumor implantation status.Successfully modeled 45 experimental rabbits were randomly divided into the following 3 groups with 15 rabbits in each group:control group(receiving no any treatment),TAE group(receiving embolization of the tumor-feeding artery with iodized oil),and C Ⅱ-3 group(CⅡ-3 of 16 mg/kg dosage being administered through the ear marginal vein for 3 consecutive days before TAE).Chemical colorimetry was used to detect the preoperative and postoperative serum ALT and AST of each group.Immunohistochemistry was used to detect the expression levels of PPAR-α and NF-κB in para-cancerous liver tissue.The levels of intercellular adhesion molecule-1(ICAM-1)and vascular cell adhesion molecule-1(VCAM-1)were measured by ELISA.The mRNA expression levels of PPAR-α,NF-κB,ICAM-1 and VCAM-1 in para-cancerous liver tissue were detected by RT-PCR.Results In the control group,TAE group and C Ⅱ-3 group,the preoperative ALT levels were(34.49±1.33)U/L,(34.01±1.21)U/Land(34.06±1.23)U/L respectively,and the preoperative AST levels were(38.44±1.41)U/L,(38.45±1.47)U/L and(38.42±1.38)U/L respectively;the postoperative ALT levels were(35.61±1.56)U/L,(118.67±3.39)U/L and(87.24±3.67)U/L respectively,and the postoperative AST levels were(41.03±1.83)U/L,(220.60±3.00)U/L and(104.46±2.66)U/L respectively.Compared with the control group,in the TAE group and C Ⅱ-3 group the AST levels were apparently elevated,but the levels of ALT and AST in the C Ⅱ-3 group were obviously lower than those in the TAE group,and the differences were statistically significant(all P＜0.05).In control group,TAE group and CⅡ-3 group,the ICAM-1 levels were(1.74±0.13)ng/L,(3.43±0.19)ng/L and(1.81±0.13)ng/L respectively;the VCAM-1 levels were(1.66±0.05)ng/L,(2.18±0.06)ng/L and(1.67±0.06)ng/L respectively;the number of experimental rabbits with positive PPAR-α were 4,3,and 10 respectively;the number of experimental rabbits with positive NF-κB were 2,11 and 3 respectively.In TAE group the positive rate of NF-κB,and the levels of NF-κB mRNA,ICAM-1,VCAM-1 protein and mRNA levels were significantly increased;the levels of PPAR-α protein and mRNA in the C Ⅱ-3 group were prominently increased when compared with the control group and TAE group,and the differences were statistically significant(all P＜0.01).Conclusion Through antagonizing the expression of NF-κB and reducing ICAM-1 and VCAM-1 levels,C Ⅱ-3 alleviate the inflammatory response,thus reducing the liver injury after TAE.

Objective To explore the perioperative safety of video-assisted thoracic surgery (VATS) in Day Care Unit and the risk factors for delayed discharge under centralized management model. Methods The patients with VATS managed by the Day Care Unit of the Drum Tower Hospital Affiliated to Nanjing University Medical School in 2021 were retrospectively collected. The patients’ postoperative data and risk factors for delayed discharge were analyzed. Results A total of 383 patients were enrolled, including 179 males and 204 females with an average age of 46.09±14.82 years. Eleven (2.87%) patients developed grade 3-4 postoperative complications during the hospitalization. Eighteen (4.70%) patients visited unscheduled outpatient clinic within 7 days, and 6 (1.57%) patients were re-hospitalized within 30 days after discharge. The remaining patients had no significant adverse events during the 30-day follow-up. The average length of hospital stay was 2.27±0.35 d. The length of hospital stay was over 48 h in 48 (12.53%) patients. The independent risk factor for delayed discharge was lobectomy or combined resection (OR=3.015, 95%CI 1.174-7.745, P=0.022). Conclusion VATS can be safely conducted under the centralized management in Day Care Unit. The risk factor for delayed discharge is the extent of surgical resection.

Objective:To evaluate the clinical effect of bispherical augment in acetabular defects reconstruction in hip revision.Methods:This is a retrospective case series study. A retrospective analysis of 119 patients (124 hips) patients who underwent hip revision surgery and reconstructed with bispherical augment for acetabular bone defects from January 2019 to December 2023 was performed. There were 57 males (58 hips) and 62 females (66 hips), aged (65.0±11.8) years (range:40 to 102 years). The body mass index was (23.9±3.5) kg/m 2 (range:16.1 to 32.2 kg/m 2). Acetabular bone defects were typed as follows: 2 hips in Paprosky type ⅡA, 29 hips in type ⅡB, 34 hips in type ⅡC, 31 hips in type ⅢA, and 28 hips in type ⅢB, of which 9 patients (9 hips) were combined with pelvic discontinuity. Differences in Harris hip score (HHS) and lower limb discrepancy (LLD) were compared between preoperatively and final follow-up. The height of the hip center of rotation and the horizontal distance from the center of rotation to the teardrop were measured by radiographs before and after surgery, and prothesis stability and the occurrence of postoperative complications were evaluated. Data were compared using the paired sample t test. Results:All patients successfully completed the operation. The operation time was (167.0±53.4) minutes (range:90 to 380 minutes) and the intraoperative bleeding was (345.3±124.2) ml (range:100 to 1 200 ml). The height of the hip center of rotation decreased from (39.7±13.0) mm preoperatively to (21.8±7.1) mm postoperatively and the horizontal distance from the center of rotation to the teardrop increased from (34.0±10.1) mm preoperatively to (38.5±5.9) mm postoperatively, and the differences were statistically significant ( t=15.859, P<0.01; t=5.266, P<0.01). All the patients were followed up for (26.1±15.4) months (range:6 to 60 months). At the last follow-up, HHS improved from (35.2±10.0) points preoperatively to (85.5±9.5) points, and the difference was statistically significant ( t=50.723, P<0.01). LLD decreased from (2.1±1.1) cm preoperatively to (0.5±0.5) cm, and the difference was statistically significant ( t=13.767, P<0.01). All acetabular components were stable and free of displacement on imaging during follow-up. Three patients suffered dislocation and received closed reduction, all prosthesis were in good position during follow-up. No dislocation, loosening, fracture, recurrence of infection and vascular nerve injury occurred in other patients. Conclusion:Bispherical augment can effectively reconstruct acetabular bone defects, restore the hip center of rotation, and improve hip joint function scores at short and mid-term follow-up.

Neuroplastin 65(NP65) is a glycoprotein class with selective expression in neurons. It is extensively expressed in the synaptic membrane of the central nervous system, and plays a fundamental role in cell adhesion and intercellular communication. In comparison to other cell adhesion molecules, the discovery of NP65 is relatively late and researches about this molecule are still in development. Further exploration and study of the pathophysiological mechanism involved in NP65 are needed. It has been confirmed that NP65 plays a pivotal role in neural activities, including regulation of synaptic formation and maintenance, modulation of synaptic plasticity, facilitation of neuronal development, and contribution to the pathogenesis of various diseases. Thus, NP65 could potentially serve as a crucial target for modulating the growth and operation of the nervous system. This paper provides a comprehensive review of the structure, distribution, function, and involvement in both physiological and pathological processes of NP65. Additionally, the future research direction for NP65 is proposed, with the aim of enhancing our understanding of its function, revealing its mechanism of action in diseases, and providing a theoretical basis for the development of related clinical applications.

Objective:To compare the clinical efficacy of the anterior approach versus the posterolateral approach for total hip arthroplasty (THA) in treating residual high dislocation secondary to pyogenic hip arthritis, and to investigate the benefits of proximal femoral reconstruction osteotomy.Methods:A retrospective study was conducted on 45 patients who underwent THA combined with proximal femoral reconstruction osteotomy for high dislocation secondary to pyogenic hip arthritis at the First Affiliated Hospital of the University of Science and Technology of China from January 2017 to September 2022. Patients were categorized into two groups based on the surgical approach: 14 in the anterior approach group and 31 in the posterolateral approach group. We analyzed surgical duration, intraoperative blood loss, postoperative visual analogue scale (VAS) scores for lateral knee pain after knee extension, postoperative limb lengthening, Harris hip scores, and complications. Radiographic assessments included anteversion and abduction angles of the acetabular cup, hip abductor muscle lever arm, hip-knee-ankle (HKA) angle of the affected side, osteotomy site bone healing rate, and prosthesis loosening.Results:The average follow-up period was 3.6±1.8 years (range, 1.0-6.7 years). The anterior approach group had a significantly longer surgical duration (141.4±21.0 min) compared to the posterolateral approach group (121.3±23.1 min). Intraoperative blood loss was significantly less in the anterior approach group (425.2±80.2 ml) compared to the posterolateral approach group (535.1±96.3 ml). The difference was statistically significant ( P<0.05). The VAS score for lateral knee pain after knee extension was significantly lower in the anterior approach group (3.2±0.8) than in the posterolateral approach group (5.7±1.1), the difference was statistically significant ( t=7.300, P<0.001). Postoperative limb lengthening was 5.0±1.5 cm in the anterior approach group and 4.5±1.4 cm in the posterolateral approach group, with no significant difference ( t=1.075, P=0.289). At the final follow-up, the Harris hip score was 86.2±5.0 in the anterior approach group and 82.5±6.8 in the posterolateral approach group, with no significant difference ( t=1.839, P=0.073). The acetabular anteversion angle, abduction angle, and HKA angle in the anterior approach group were 12.9°±5.8°, 42.6°±6.2°, and 179.8°±1.4°, respectively, while in the posterolateral approach group they were 14.5°±7.0°, 44.2°±3.1°, and 178.8°±2.1°, respectively. The differences between the groups were not statistically significant ( P>0.05). The hip abductor muscle lever arm was 5.6±0.7 cm on the surgical side compared to 5.9±0.6 cm on the healthy side, with no significant difference ( t=1.916, P=0.059). All patients achieved bone healing at the osteotomy site by the final follow-up. One patient in the anterior approach group experienced femoral prosthesis subsidence but did not require femoral revision. Two patients in the posterolateral approach group experienced hip dislocation, both of which were managed with intravenous anesthesia and closed reduction. Conclusion:The anterior approach for THA combined with proximal femoral reconstruction osteotomy yields better clinical outcomes compared to the posterolateral approach, including reduced intraoperative blood loss, decreased lateral knee pain, and a lower rate of dislocation. Proximal femoral reconstruction osteotomy effectively restores the hip abductor muscle lever arm with a high rate of osteotomy site healing.

Objective:To compare the efficacies of 3D printed guide plate assisted positioning and C-arm X-ray machine fluoroscopic positioning for femoral tunnel reconstruction of medial patellofemoral ligament in treating recurrent patellofemoral dislocation.Methods:A retrospective cohort study was performed on the clinical data of 60 patients with recurrent patellar dislocation admitted to the First Affiliated Hospital of Kunming Medical University from January 2018 to December 2022. The patients included 29 males and 31 females, with age range of 14-40 years [(28.6±7.6)years]. The 3D printed guide plate was used to locate the femoral tunnel in 30 patients for medial patellofemoral ligament reconstruction (3D guide group), and C-arm X-ray machine was used for another 30 patients (conventional group). (1) CT data of the knee joint were collected before surgery and at 7 days after surgery. Mimics 19.0 software was introduced to measure the distance between the center of femoral tunnel and Sch?ttle point after surgery. (2) Knee Lysholm score and Kujala score were used to evaluate the knee function before and at 3, 6, 9 and 12 months after surgery. (3) At the same time points, Opti-Knee TM 3D knee kinematics analysis system was used to collect the forward and backward displacement, up and down displacement, internal and external displacement, internal and external flipping angle, internal and external rotation angle, and flexion and extension angle of the affected knee joint. The range of each freedom degree was calculated and 6 freedom degree items of 30 healthy people were subjected to knee kinematics analysis. Results:All patients were followed up for 12-15 months [(12.3±0.7)months]. (1) The distance between the center of femoral tunnel and Sch?ttle point in the 3D guide group was (5.5±2.3)mm, smaller than that in the conventional group [(7.6±2.5)mm] ( P<0.01). (2) The Lysholm score and Kujala score of the 3D guide group and conventional gruop gradually increased after surgery (all P<0.01). There were no significant differences in the Lysholm score or Kujala score between the 3D guide group and conventional gruop before surgery and at 12 months after surgery (all P>0.05). At 3, 6 and 9 months after surgery, the Lysholm score of the 3D guide group [(70.4±4.5)points, (86.4±3.1)points, (91.2±3.2)points] and Kujala score [(74.2±5.3)points, (80.9±3.5)points, (85.2±3.2)points] were higher than those of the conventional group [Lysholm score: (67.3±5.2)points, (81.8±2.5)points, (86.2±1.9)points; Kujala score: (69.8±5.2)points, (77.6±2.1)points, (82.7±2.6)points] ( P<0.05 or 0.01). (3) Before surgery, the forward and backward displacement in the 3D guide group and conventional group [(0.6±0.1)cm, (0.6±0.2)cm], up and down displacement [(0.5±0.1)cm, (0.6±0.0)cm], internal and external displacement [(0.7±0.1)cm, (0.6±0.2)cm], and flexion and extension angle [(50.6±10.3)°, (51.6±8.5)°] were less than those in the healthy controls [(1.6±0.3)cm, (1.7±0.5)cm, (1.0±0.4)cm, (63.2±5.1)°] (all P<0.05), while the internal and external flipping angle [(17.5±4.0)°, (17.1±3.8)°] and internal and external rotation angle [(17.9±1.9)°, (17.5±1.5)°] were greater than those in the healthy controls [(11.8±3.6)°, (15.8±4.9)°] (all P<0.05). At other time points, the results of front and back displacement, up and down displacement, internal and external displacement, internal and external rotation angle in the 3D guide group and conventional group were not significantly different compared with the healthy controls (all P>0.05). The flexion and extension angle in the 3D guide group and conventional gruop were smaller than those in the healthy controls at 3 months after surgery (all P<0.05). At 6 and 9 months after surgery, the flexion and extension angle in the conventional group [(55.0±3.7)°, (57.7±4.8)°] were smaller than those in the healthy controls [(63.2±5.1)°, (63.2±5.1)°] (all P<0.05), but no significant difference was found between the 3D guide group [(61.0±4.8)°, (61.8±4.9)°] and the healthy controls (all P>0.05). The flexion and extension angle in the 3D guide group and conventional gruop was similar with that in the healthy controls at 12 months after surgery (all P>0.05). Conclusions:Compared with the C-arm X-ray machine, the 3D printed guide plate assisted positioning of femoral tunnel is more simple and accurate for the medial patellofemoral ligament reconstruction in treating recurrent patellofemoral dislocation, together with better early knee function recovery, better satisfaction of the patients, and better and faster restoration of the flexion and extension angle of knee joint kinematic function.

Objective:To compare the clinical efficacies between arthroscopic anatomic single bundle reconstruction of posterior cruciate ligament (PCL) assisted by internal tension relieving technique combined with rapid rehabilitation and anatomic single bundle reconstruction combined with conventional rehabilitation in the treatment of PCL rupture.Methods:A retrospective cohort study was used to analyze the clinical data of 88 patients with PCL rupture admitted to First Affiliated Hospital of Kunming Medical University from September 2016 to September 2020. The patients included 65 males and 23 females, aged 18-55 years [(39.3±10.8)years]. Forty-four patients underwent arthroscopic anatomic single bundle reconstruction of PCL assisted by internal tension relieving technique combined with rapid rehabilitation therapy (tension-relieving group), and 44 patients underwent arthroscopic routine anatomic single bundle reconstruction of PCL combined with conventional rehabilitation (traditional group). The two groups were compared before and at 3, 12, and 24 months after surgery regarding the following items: International Knee Literature Committee (IKDC) score, Hospital for Special Surgery (HSS) score, Lysholm score, knee motion cycle (maximum stride length, minimum stride length, and stride frequency) and 6 kinematic indicators (angle of forward and back extension, angle of internal and external rotation, angle of internal and external rotation, up and down displacement, internal and external displacement, and forward and back displacement). The Marburger arthroscopy score (MAS) and Professor Ao Yingfang′s improved score by secondary arthroscopy were compared between the two groups at 12 months after surgery. The perioperative complications were observed.Results:All patients were followed for 24-36 months [(25.5±6.3)months]. In tension-relieving group and the traditional group, the values of IKDC score were (71.8±9.8)points and (68.5±6.5)points at 3 months after surgery, (87.6±6.0)points and (87.6±5.5)points at 12 months after surgery, and (95.5±3.1)points and (92.8±11.6)points at 24 months after surgery, respectively. The values were gradually increased, significantly higher than those before surgery [(48.1±16.9)points and (47.1±15.0)points] (all P<0.05). There were no significant differences between the two groups at each time point (all P>0.05). In tension-relieving group and the traditional group, the values of HSS score were (74.2±6.2)points and (68.4±9.5)points at 3 months after surgery, (91.9±5.4)points and (88.4±4.7)points at 12 months after surgery, and (97.1±2.0)points and (96.2±2.8)points at 24 months after surgery, respectively. The values of HSS score gradually increased, significantly higher than those before surgery [(57.5±17.7)points and (56.8±14.3)points] (all P<0.05). At 3 and 12 months after surgery, the values of HSS score in the tension-relieving group were significantly higher than those in the traditional group (all P<0.05), but others were not significantly different between the two groups (all P>0.05). In tension-relieving group and the traditional group, the values of Lysholm score were (74.2±14.9)points and (70.3±7.5)points at 3 months after surgery, (90.9±6.1)points and (88.7±4.7)points at 12 months after surgery, and (96.9±3.0)points and (96.3±2.8)points at 24 months after surgery, respectively. The values of Lysholm score were gradually increased, significantly higher than those before operation [(48.7±20.7)points and (48.2±19.9)points] (all P<0.05). There were no significant differences between the two groups at any time points (all P>0.05). At 3, 12, and 24 months after surgery, the motion cycle (maximum stride length, minimum stride length and stride frequency) and 6 kinematic indicators (angle of forward bending and backward extension, angle of internal and external rotation, angle of internal and external rotation, internal and external displacement, up and down displacement, and forward and backward displacement) of knee joint were significantly improved in both groups compared with those before surgery (all P<0.05). At 3, 12, and 24 months after surgery, the forward and backward displacement in the tension-relieving group was significantly decreased than that in the traditional group (all P<0.05), but others were not significantly different between the two groups (all P>0.05). The MAS was rated as excellent to good in 14 patients and fair to poor in 2, with the excellent and good rate of 87.5% (14/16) in the tension-relieving group, while the score was rated as excellent to good in 11 patients and fair to poor in 3, with the excellent and good rate of 78.6% (11/14) in the traditional group ( P>0.05). The Professor Ao Yingfang′s improved score was (10.6±1.5)points in the tension-relieving group, markedly higher than that in the traditional group [(9.6±2.3)points] ( P<0.05). No perioperative complications were observed. Conclusion:Compared with anatomic single bundle reconstruction combined with conventional rehabilitation, arthroscopic anatomic single bundle reconstruction of PCL assisted by internal tension relieving technique combined with rapid rehabilitation have higher subjective function score, better anteroposteric stability during knee movement, and better results of secondary microscopy.