Objective:To explore the early clinical effect of arthroplasty with rotating hinge knee prosthesis in the treatment of severe knee deformity.Methods:A retrospective study was conducted on 55 patients who underwent primary rotating hinge knee arthroplasty at Shanghai Sixth People's Hospital from January 2017 to October 2023, including 19 male patients and 36 female patients, with an average age of 60.9±9.0 years (ranging from 31 to 74 years). The four main indications were end-stage deformity of osteoarthritis (valgus/varus>20°, 16 cases), post-traumatic joint deformity (15 cases), severe joint ligament instability (12 cases), and neuromuscular or immune diseases (12 cases). The patients were divided into two age groups: ≥60 years old group (32 cases) and <60 years old group (23 cases). Various pre-operative and post-operative data, including knee society score (KSS), range of motion (ROM), forgotten joint score (FJS), degree of force line offset and post-operative complications, were collected and compared.Results:All the 55 cases successfully underwent the operation. The operation time was 102.3±15.8 min. The intraoperative blood loss was 63±23.7 ml. The follow-up time was 37.2±7.9 months. KSS clinical score increased from 27.5(12, 45) before surgery to 90.5(85, 95) after surgery ( P<0.001) and the mean score of KSS function increased from 50.4(45, 60) before surgery to 84.3(85, 95) after surgery ( P<0.001), both with significant difference ( P<0.05). Similarly, the average postoperative ROM improved from 97.2°±34.4° to 120.1°±10.9°with significant difference ( P<0.05). The postoperative FJS was 81.0±6.6. Up to the last follow-up, the implant survival rate was 98%[95% CI(90.4%, 99.6%)]. For the all four groups of end-stage deformity of osteoarthritis, post-traumatic joint deformity, severe joint ligament instability and neuromuscular or immune diseases, both the KSS score and the ROM of the knee joint were significantly improved. There was no significant difference in neither the KSS score or the ROM of the knee joint between the ≥60 years old group and the <60 years old group ( P>0.05). The incidence of complications was 24% (13/55). The complication rates for patients with end-stage deformity of osteoarthritis, post-traumatic joint deformity, severe joint ligament instability and neuromuscular or immune diseases were 12.5% (2/16), 20% (3/15), 25% (3/12), and 41.7% (5/12) respectively, without significant difference. The incidence of complications in elderly patients (85%, 11/13) was much higher than that in younger patients (5%, 2/42),with significant difference ( P<0.05). Conclusions:For end-stage deformity of osteoarthritis (valgus or varus >20°), post-traumatic joint deformity, severe joint ligament instability and neuromuscular or immune diseases, the rotating hinge knee can provide good clinical improvement effects. For neuromuscular or immune diseases, the incidence of complications was relatively high. The therapeutic effect of patients over 60 years old showed no significant difference in the early postoperative efficacy compared with younger patients, but the complications of elderly patients were much higher than those of younger patients.

Objective:To explore the early clinical effect of arthroplasty with rotating hinge knee prosthesis in the treatment of severe knee deformity.Methods:A retrospective study was conducted on 55 patients who underwent primary rotating hinge knee arthroplasty at Shanghai Sixth People's Hospital from January 2017 to October 2023, including 19 male patients and 36 female patients, with an average age of 60.9±9.0 years (ranging from 31 to 74 years). The four main indications were end-stage deformity of osteoarthritis (valgus/varus>20°, 16 cases), post-traumatic joint deformity (15 cases), severe joint ligament instability (12 cases), and neuromuscular or immune diseases (12 cases). The patients were divided into two age groups: ≥60 years old group (32 cases) and <60 years old group (23 cases). Various pre-operative and post-operative data, including knee society score (KSS), range of motion (ROM), forgotten joint score (FJS), degree of force line offset and post-operative complications, were collected and compared.Results:All the 55 cases successfully underwent the operation. The operation time was 102.3±15.8 min. The intraoperative blood loss was 63±23.7 ml. The follow-up time was 37.2±7.9 months. KSS clinical score increased from 27.5(12, 45) before surgery to 90.5(85, 95) after surgery ( P<0.001) and the mean score of KSS function increased from 50.4(45, 60) before surgery to 84.3(85, 95) after surgery ( P<0.001), both with significant difference ( P<0.05). Similarly, the average postoperative ROM improved from 97.2°±34.4° to 120.1°±10.9°with significant difference ( P<0.05). The postoperative FJS was 81.0±6.6. Up to the last follow-up, the implant survival rate was 98%[95% CI(90.4%, 99.6%)]. For the all four groups of end-stage deformity of osteoarthritis, post-traumatic joint deformity, severe joint ligament instability and neuromuscular or immune diseases, both the KSS score and the ROM of the knee joint were significantly improved. There was no significant difference in neither the KSS score or the ROM of the knee joint between the ≥60 years old group and the <60 years old group ( P>0.05). The incidence of complications was 24% (13/55). The complication rates for patients with end-stage deformity of osteoarthritis, post-traumatic joint deformity, severe joint ligament instability and neuromuscular or immune diseases were 12.5% (2/16), 20% (3/15), 25% (3/12), and 41.7% (5/12) respectively, without significant difference. The incidence of complications in elderly patients (85%, 11/13) was much higher than that in younger patients (5%, 2/42),with significant difference ( P<0.05). Conclusions:For end-stage deformity of osteoarthritis (valgus or varus >20°), post-traumatic joint deformity, severe joint ligament instability and neuromuscular or immune diseases, the rotating hinge knee can provide good clinical improvement effects. For neuromuscular or immune diseases, the incidence of complications was relatively high. The therapeutic effect of patients over 60 years old showed no significant difference in the early postoperative efficacy compared with younger patients, but the complications of elderly patients were much higher than those of younger patients.

Objective:To observe the effect of 3D-printed guide plate-assisted percutaneous bone cement-augmented sacroiliac screw fixation in the treatment of pelvic fragility fractures in the elderly.Methods:A total of 11 elderly patients with pelvic fragility fractures who underwent 3D-printed guide plate-assisted percutaneous cement-enhanced sacroiliac screw fixation (cemented group) in the Department of Traumatic Orthopaedics of the General Hospital of Ningxia Medical University from December 2022 to April 2024 were retrospectively analyzed. There were 3 males and 8 females, aged 73.18±4.42 years (range, 67-80 years). There were 4 cases of typeⅡand 7 cases of typeⅢ. At the same time, 10 elderly patients with pelvic fragility fractures who underwent percutaneous sacroiliac screw fixation assisted by 3D-printed guide plate (cementless group) were selected as control group, including 5 males and 5 females, aged 73.90±6.51 years (range, 67-85 years). Pelvic fragility fractures were classified as typeⅡin 5 cases and typeⅢin 5 cases. The perioperative indicators, visual analogue scale (VAS), Barthel index and postoperative complications were compared between the two groups.Results:All patients successfully completed the operation and were followed up for 17.05±5.48 months (range, 9-27 months). The operation time and fluoroscopy frequency in the bone cement group were 72.09±3.95 min and 12.45±0.93 times, which were significantly higher than those in the non-bone cement group 57.00±4.24 min and 8.50±0.97 times, the difference was statistically significant ( P<0.05). All patients' fractures healed in one stage, the healing time was 97.09±7.15 d in the cemented group and 103.00±13.14 d in the uncemented group, the difference was not statistically significant ( t=1.297, P=0.210), and there was no case of delayed healing or non-healing. The postoperative weight-bearing time of the bone cement group was 44.73±3.72 d, which was shorter than that of the non-bone cement group 59.10±7.37 d, and the difference was statistically significant ( P<0.05). The VAS scores of the bone cement group at 1 day, 1 week and 3 weeks after operation were 5.73±0.65, 4.64±0.51 and 3.27±0.65, respectively, which were lower than those of the non-bone cement group 6.80±0.42, 5.30±0.48 and 4.00±0.67. The difference was statistically significant ( P<0.05). The Barthel index of bone cement group was higher than that of non-bone cement group at 1 day, 1 week, 3 weeks, 6 weeks and 2 months after operation, and the difference was statistically significant ( P<0.05). Bone cement leakage occurred in 2 patients in the bone cement group, and they did not complain of special discomfort and were not treated. In the non-cemented group, two cases showed screw withdrawal and the sacroiliac screws were removed in a second operation; one case showed sacral plexus nerve injury, and the screws were removed and treated with oral methylcobalamin symptomatic therapy one month after the operation, and the symptoms were relieved after three months. Conclusion:3D-printed guide plate-assisted percutaneous cement-augmented sacroiliac screw fixation for the treatment of elderly pelvic fragility fracture can alleviate postoperative pain, shorten the weight-bearing time, and help to promote early recovery and improve postoperative quality of life.

Objective To discuss the method and effect of large renal staghorn calculi by anatrophic nephrolithotomy (AN).Methods Fifty-two patients with large renal staghom calculi underwent AN.Bilateral renal calculi disease was present in 3 patients,so that a number of 55 procedures were operated.Preoperative evaluation included urinalysis,urine culture,renal function,and ultragound,CT,KUB and IVU.A flank incision was between the 11th and 12th ribs and the kidney was freed.After interrupted renal pedicle in situ hypothermia,the renal parenchyma incision was made along the avascular plane which is outside in the back of the kidney.The collecting system was opened.The calculi were removed.The collecting system was reconstructed.The renal parenchyma was closed and the renal circulation was reestablished.The protected management of renal function was made intraoperative.Postoperative follow-up consisted of urinalysis,renal function,ultrasound,KUB,IVU and ECT.Results The operative time was (117±45) minutes.The renal ischemia time WaS (29±15)minutes.Five cases underwent blood transfusion.Mean amount of blood transfusion was 230 ml.Four cases had remained calculi.The stone-free rate was 92.3%.No recent complication occurred after operation.Postoperative follow-up indicated that renal function was normal.Conclusions AN is the most appropriate method for patients with large renal staghorn calculi because of the highest stone-free rate,the lowest stone-recurred rate and a safe and effective operative procedure with less complication.Renal function damages just little through a series of protected management.Nephrectomy is avoided to part of patients.