Periprosthetic infection is a catastrophic complication after joint replacement. Choosing appropriate treatment for patients with different infection characteristics is the key to improve the success rate. The one-stage revision has been applied and studied more and more in clinical work because of its advantages in treatment cycle, functional recovery, complications and cost. Grasping the indications and contraindications, comprehensive analysis and selection of appropriate patients, considering intraoperative details and postoperative anti-infection treatment meticulously, are crucial to reduce the recurrence rate of infection. The purpose of this paper is to describe the main points of the one-stage revision in the treatment of periprosthetic infection, and to summarize the classic and recent research on the one-stage revision.

Objective To explore the validity of proximal medial gastrocnemius release (PMGR) for treating unilateral chronic plantar fasciitis.Methods The prospective study was conducted.From January 2018 to July 2018,56 patients who were diagnosed chronic plantar fasciitis in Department of Orthopaedics,Beijing Friendship Hospital,Capital Medical University,were enrolled and divided into study group (n =28) and control group(n =28) according to different therapies.Fifty-six patients were enrolled including 33 males and 23 females,the age was (48.1 ±6.2) years (range,43.9-57.1 years).The patients in study group were treated with PMGR for unilateral chronic plantar fasciitis.Meanwhile,the patients in control group were treated by shock wave therapy,one extracorporeal shock wave therapy was accepted every 3 days,each impact 2 000 times,a total of five times.Visual analogue scale (VAS),the American orthopaedic foot and ankle hindfoot scale (AOFAS) and dorsal extension range of ankle joint of all patients before treatment and 3 months after treatment were recorded and compared.All the patients were outpatient followed for (3.9 ± 0.7) months until October 2018,the pain and function of feet were recorded.Measurement data with normal distribution were expressed as mean ± standard deviation (Mean ± SD).The data were statistically analyzed by t test between two groups.Count data were analyzed by chi-square test between two groups.Results In study group,preoperative VAS,AOFAS and dorsal extension angleof ankle joint were (6.9 ± 0.8) scores,(48.4 ± 2.8) scores and (10.8 ± 3.9) °,while 3 months after treatment VAS,AOFAS and dorsal extension angleof ankle joint were (2.1 ± 1.0) scores,(82.8 ± 3.6) scores and (21.9 ± 4.8)°.The difference between pre-operation and 3 months after treatment of study group was significant(P ＜ 0.05).In control group,VAS,AOFAS and dorsal extension angle of ankle joint were (6.1 ± 0.7) scores,(49.1 ± 2.8) scores and (11.8 ± 3.6) ° before treatment,while VAS,AOFAS and dorsal extension range of ankle joint were (3.8 ± 1.2) scores,(56.0 ± 3.6) scores and (12.2 ± 3.2) ° at 3 months after treatment.There were significant differences in VAS between pre-treatment and 3 months after treatment (P ＜ 0.05).There were no significant differences in AOFAS and dorsal extension angleof ankle joint between pre-treatment and 3 months after treatment (P ＞ 0.05).At 3 months after treatment,there were significant differences in VAS,AOFAS and dorsal extension angle of ankle joint between two groups(P ＜ 0.05),and the outcome of study gronp was better than the control group.Conclusions PMGR can not only relief pain of foot but also improve ankle function.This is an effective surgical treatment for unilateral chronic plantar fasciitis.

Objective:To compare the accuracy of two methods in reducing leg length discrepancy(LLD)during hip hemiarthroplasty.Methods:We retrospectively analyzed 89 patients of hip hemiarthroplasty who suffered from femoral neck fracture.There were 47 patients in the new method group(NM), and 42 patients in the traditional method group(traditional method, TM)which comparing the position of the greater trochanter tip and the center of the femoral head.In the NM group, the distance from the center of femoral head to the lesser trochanter(L)and the diameter of femoral head(D)of the healthy side hip were measured on preoperative anteroposterior pelvic X-ray film, and the ratio(R)of D to L was calculated.During operation, the diameter of the femoral head(d)was measured with a caliper, and the distance should be obtained from the center of the femoral head prosthesis to the lesser trochanter according to the ratio R of the healthy side.The difference of postoperative LLD between the two groups and the incidences of |LLD| in each range were compared.Results:In the NM group, the maximum LLD was 11.10 mm and the minimum LLD was -4.0 mm, with an average of(4.4±3.2)mm, 80.9%(38/47)| LLD | < 6 mm, 93.6%(44/47)| LLD | < 10 mm, 6.4%(3/47)| LLD | ≥ 10 mm.In the TM group, the maximum LLD was 13.2 mm and the minimum LLD was -8.3 mm, with an average of (6.2±5.1)mm, 42.9%(18/42)|LLD|<6 mm, 69.0%(29/42)|LLD| <10 mm, 31.0%(13/42)|LLD|≥10mm.The differences of patients of the mean postoperative LLD and the incidences of |LLD| in each range between two the groups were statistically significant( t=-2.036、 χ2=14.629, P=0.046、0.001). Conclusions:The new method is simple, convenient, more accurate and can obtain a more satisfactory LLD compared with the traditional method which refers to the relative position of the great trochanter tip and the center of the femoral head.

Objective To evaluate the short-term clinical efficacy of three dimension printed titanium augments for the reconstruction of acetabular bone defects in revision total hip arthroplasty.Methods The retrospective study was conducted.To retrospectively analyze clinical data of 21 patients who were underwent revision total hip arthroplasty with severe acetabular bone defects reconstructed by three dimension printed titanium augment from March 2016 to September 2017 from Department of Orthopaedics,Beijing Friendship Hospital,Capital Medical University.There were 9 males and 12 females,age (58.9 ± 6.3) years,51-67 years,body mass index (23.8 ± 2.9) kg/m2.According preoperative CT scan of hip joints,three dimension printed titanium augments were designed for acetabular defects personality.The data including the vertical distance from centre of rotation to the interteardrop line in X-ray examination,preoperative Harris score,final follow-up Harris score of hip postoperatively,and complications were recorded.Outpatient visits ranged from 11.8 to 19.6 months.Measurement data were expressed as (Mean ± SD),and t test was used before and after surgery.Results For X-ray examination,the average vertical distance from centre of rotation to the interteardrop line was (6.1 ± 1.2) cm preoperatively and (2.8 ± 0.7) cm postoperatively,and the difference was statistically significant (P ＜ 0.01).The hip Harris score increased from preoperative (47.5 ± 6.4) scores to the last follow-up (84.6 ± 5.9) scores,and the difference was statistically significant (P ＜ 0.01).The final follow-up data showed the acetabular prosthesis and augments were stable,while there were no hip joint dislocation,periprosthetic joint infection,loosening of acetabular components and other complications.Conclusion Three dimension printed augments can reconstruct severe acetabular bone defects and restore the hip rotation centre.

Objective To explore the validity of two-staged revision for hip periprosthetic joint injection and intermediate-term clinical effects.Methods The clinical data of 31 cases who were underwent two-staged revision for unilateral hip periprosthetic joint infection in Department of Orthopaedics,Beijing Friendship Hospital,Capital Medical University from March 2014 to September 2016 were analyzed retrospectively.There were 13 males and 18 females,aged (67.5 ±7.8) years,with an age range of 52-79 years.All patients underwent two-staged revision,taking preoperative and intraoperative joint puncture fluid,intraoperative infection of soft tissue for bacterial culture was to clear medication.In first stage,prosthesis removed,debridement performed and antibiotic spacer implanted were performed.Antibiotics were used for 8 to 12 weeks for infection.In second stage,total hip arthroplasty revision was performed while infection was controlled.Harris hip scores,Short form 36 health status scores (SF-36),white blood cell counts,C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR)were compared between preoperative and postoperative follow-up in all patients,and postoperative complications were recorded.Postoperative outpatient follow-up was 30.1 to 59.3 months,and reviewed every 12 months after 3 months,6 months,and 12 months.The follow-up deadline was April 2019.Measurement data were expressed as mean ± standard deviation (Mean ± SD).The t test was used to compare the preoperative and postoperative follow-up.Results All 29 patients were followed up for follow-up except 2 patients were lost to follow-up.Preoperative Harris hip score,SF-36,white blood cell count,CRP and ESR were (39.4 ± 5.6) scores,(398.8 ± 39.2) scores,(12.5 ± 0.6) × 109/L,(63.3 ± 10.1) mg/L and (83.7 ± 12.5) mm/h,respectively.The last follow-up oftbe above indicators were (76.9 ±9.3) scores,(649.3 ±67.5) scores,(9.1 ±0.5) × 109/L,(5.3 ± 1.7) mg/L and (10.2 ± 1.6) mm/h,respectively.The results of final followed-up were much better than the preoperative results and there were significant differences between postoperation and preoperation for all indexes.One patient developed postoperative hip dislocation and was treated with manual reduction under general anesthesia.The two patients were diagnosed hip periprosthetic joint infection of joint at 8 months and 15 months respectively after two-staged revision and treated by removing the hip prosthesis.One patient was performed revision again and the other was not performed any operation for poor health condition.The remaining 26 patients had no complications.Conclusions Two-staged revision for periprosthetic joint infection of hip joint can not only treat infection effectively but also can recover hip function significantly.The early and intermediate-term clinical effects of the surgical treatment is satisfied.