Die Patellaluxation als Ursache osteochondraler Frakturen im femoropatellaren Gleitlager

Acute traumatic dislocation of the patella may be associated with osteochondral fractures. Clinical examination invariably shows a tense effusion. A detailed radiographic examination including antero-posterior, lateral and skyline views of the patella is usually necessary to establish an exact diagnosis. Once diagnosis is made open reduction and fixation of the osteochondral fracture should be carried out if it is possible. Out of 78 patients of our own with patella dislocation 24 cases suffered an osteochondral fracture. In ten cases refixation of the osteochondral fragment was achieved. Intraoperatively the alignment of the patella was controlled in any case. In cases of lateral subluxation lateral release and medial reconstruction was performed. In two cases medial transfer of the tibial tuberosity was carried out. Osteochondral fractures of the femoro-patellar groove represent an important injury in the course of acute patellar dislocation. With exact diagnosis and correct treatment congruity of the femoro-patellar joint can be restored in many cases.     

Knee joint hemarthrosis--differential diagnostic considerations for planning an operation

From 1980 to the end of 1988, arthroscopy has been performed on 620 patients with acute hemarthrosis of the knee joint. Of all the intraarticular lesions, 89.4% required surgery. Arthroscopy has changed in the last decade from diagnostic screening to invasive instrumentation for exact operative planing and alternative operative techniques. Hemarthrosis in stable knee joints was caused by minor lesions (7.84%) that did not require surgical procedures. Seventy-three patients had traumatic patellar dislocations--in 33 cases associated with chondral or osteochondral fractures. In 54.8% of the isolated medial retinacular ruptures, simple suture was performed in 14 cases--3 times arthroscopically and 11 times open, combined with lateral retinacular release without redislocation following. Associated chondral fracture indicated surgery in all cases. Isolated meniscus pathology (12.48%) was treated by arthroscopy alone, and refixation of the medial meniscus was carried out using the inside-out technique in 27 cases. Arthroscopic elevation of lateral tibia plateau fracture--indicated by type II fracture according to the AO classification--was performed in 3 cases with excellent results, and was associated with screw fixation and image intensification in 2 patients. Intercondylar eminence fracture is an excellent indication for arthroscopic refixation in the presence of the mono- or two-fragment type of fracture. ACL rupture is the main intra-articular pathology (64.8%) for hemarthrosis of the knee joint, which was diagnosed as an acute injury within the 1st week following trauma (51.04%). Anterior instability can be detected clinically if a careful examination with the Lachman test, combined with the missing end-point and pivot-shift test, is performed.(ABSTRACT TRUNCATED AT 250 WORDS)     

Chondral and osteochondral fractures

The incidence of traumatic chondral and osteochondral fractures and their role in the development of joint degeneration are not fully elucidated. While assessing traumatic knee injuries, one important criterion for the diagnosis of chondral fractures is to remember the possibility of a chondral or osteochondral fracture. Symptoms in osteochondral fractures are more obvious and cause severe pain and difficulty in movement of knee with hemarthrosis. The presence of hemarthrosis facilitates the diagnosis of an osteochondral fracture. Chondral and osteochondral fractures may be associated with other intra-articular pathologies. There are two main mechanisms of these fractures, including a direct effect causing avulsion or impaction and, a more common mechanism, flexion-rotation force to the knee, which is also the mechanism for an acute patellar dislocation. It is known that arthroscopic treatment is the best method for the diagnosis and treatment of chondral and osteochondral fractures. In osteochondral lesions, the aim of treatment is to restore the congruity of articular surfaces. In agreement with literature data, our clinical experience favors internal fixation as the most effective method for the treatment of osteochondral fractures.     

Osteochondral fracture of the patella without soft tissue injury and with no dislocation: A case report

IntroductionOsteochondral fracture of the patella is a fairly common pathology, but almost always associated with a spectrum of soft tissue injuries including anterior cruciate ligament (ACL) rupture. We present a rare case of an osteochondral fracture of the patella in the absence of ligament or soft tissue injuries and with no dislocation of the patella in a pediatric patient.Presentation of caseAn 11-year-old male presented to the orthopedic clinic on crutches following a football injury. The patient had pain in his left knee with flexion deformity. Plain film radiography of the left knee was taken, and an osteochondral fracture of the patella was suspected. Further imaging studies were conducted including computed tomography (CT) and magnetic resonance imaging (MRI) which revealed an isolated osteochondral fracture of the patella with no other associated injuries. Open reduction and internal fixation of the displaced fragment was successfully preformed with favorable outcomes. During follow-up, almost full range of motion was regained, and plain film radiography revealed healed fracture with a normal appearance of the patella.DiscussionTraumatic osteochondral fracture of the patella is a common injury and most of these injuries are commonly accompanied by an acute dislocation of the patella or soft tissue injuries such as rupture of the anterior cruciate ligament (ACL) and almost half of all patellar dislocations incidence are associated with osteochondral fractures of the patella. This case had an isolated osteochondral fracture of patella.ConclusionAs demonstrated in this case, osteochondral fractures are common among younger population and patients need to be thoroughly evaluated. Advanced Imaging such as MRI and CT are essential to exclude soft tissue injuries. Although management is highly variable, the importance of open reduction and early fixation should be emphasized for optimal outcomes.     

Allograft closure of lateral release after revision total knee arthroplasty

Lateral patellar retinacular release (lateral release) is a common technique for resolving patellar tracking issues during total knee arthroplasty. Complications such as hemarthrosis, wound healing complications, patellar fracture, reflex sympathetic dystrophy, and medial subluxation of the patella have been described. This is a case presentation of a 69-year-old woman who developed severe prepatellar bursitis from a sinus tract resulting from a lateral release after total knee arthroplasty. After failing nonoperative modalities, she was treated with an allograft dermal tissue graft (AlloDerm; LifeCell Corp, Branchburg, NJ) over the defect, which has resulted in resolution of symptoms at 2-year follow-up.     

Extra-articular Synovial Fluid Extravasation Following Operative Fixation of an Osteochondral Fracture of the Patella

Osteochondral fracture of the patella following a lateral patellar dislocation can be treated with operative and nonoperative techniques that are dictated by the clinical presentation. In the presence of large fragments following acute fractures, arthroscopic retrieval and fixation are advocated, whereas smaller displaced fragments may be removed and discarded as loose bodies. Several methods of fixation exist for osteochondral fractures of the patella, including the use of cannulated and noncannulated screws.This article describes a case of an elite competitive swimmer who sustained a lateral patellar dislocation with a large osteochondral fracture of the patella that was treated with open reduction and fixation using absorbable cannulated screws in an inside-out fashion. In the early postoperative period, the patient developed a symptomatic synovial fluid fistula through a cannulated screw to the prepatellar space. The diagnosis of this condition was made clinically and confirmed with noncontrast magnetic resonance imaging 6 weeks postoperatively. The symptoms of pain, skin erythema, and swelling were self-limited and eventually resolved with observation, allowing the athlete to return to his previous activity level. Magnetic resonance imaging 3 years postoperatively showed the complete resolution of the fluid extravasation.Extra-articular synovial fluid extravasation is as a rare complication following routine knee arthroscopy, accounting for 3.2% of the complications. This article describes a rare, self-limited complication following open fixation of an osteochondral fracture of the patella.     

Chondral and osteochondral injuries associated with acute patellar dislocation

Purpose: The purpose of this study was to evaluate the frequency and precise pathology of articular cartilage injuries after acute patellar dislocation. Type of Study: Case series. Methods: In 39 consecutive knees with initial lateral patellar dislocation, the articular cartilage injuries were examined using arthroscopy or macroscopic observation. Results: Thirty-seven knees (95%) had articular cartilage injuries of the patellofemoral joint and 2 knees (5%) had no cartilage injury. In all 37 knees (95%), articular cartilage injuries were observed in the patella. The appearances were categorized into 3 groups: cracks alone (9 knees), cartilage defect caused by osteochondral or chondral fracture (7 knees), and cartilage defects caused by osteochondral or chondral fracture associated with cracks (21 knees). The main site of osteochondral fracture was the medial facet, and the main site of cracks was the central dome. Twelve knees (31%) had cartilage injury of the lateral femoral condyle. Conclusions: From this study, articular cartilage injuries, especially of the patella, seem to be common occurrences after acute patellar dislocation. Chondral and osteochondral injuries of the patella were classified into 3 groups.     

Resorbable pin refixation of an osteochondral fracture of the lateral femoral condyle due to traumatic patellar dislocation: case management, follow-up and strategy in adolescents

AIM: Intraarticular osteochondral fractures resulting from traumatic patellar dislocation in children are reported most frequently between 13 and 15 years of age. Fracture localization concerns, apart from loose intraarticular bodies, the inferiomedial patellar facet and the lateral femoral condyle. Osteochondral fractures of the lateral femoral condyle with more than 50 % of its surface are extremely rare and reported infrequently. METHOD: We report a traumatic patellar dislocation in a 14 year old patient that let to an osteochondral fracture of the lateral femoral condyle. MRI-scan demonstrated an extensive fracture size concerning more than 50 % of the condylar surface with intraarticular dislocation. Initially arthroscopic surgery followed an open reduction and internal refixation of the osteochondral fragment with resorbable, poly-p-dioxanon pins. RESULTS: Follow-up MRI-scan revealed 7 weeks after surgery an adequate repositioning of the fragment with correct pin placement. Second-look arthroscopy demonstrated an osteochondral reintegration of the fragment within a period of 7 months after prior surgery. CONCLUSION: Resorbable poly-p-dioxanon pins as a mean for refixation of an osteochondral, intraarticular fracture in an adolescent, with an arthroscopic confirmed acceptable result, seem to be a considerable therapy option.     

Arthroscopy of the acute traumatic knee in children: Prospective study of 138 cases

We performed diagnostic arthroscopy for acute knee trauma in 138 children and adolescents aged 13 (1-15) years. The compatibility between the clinical examination and the arthroscopic findings was 59 percent. Ligament injuries were found in 32 cases, 14 of which had rupture of the anterior cruciate ligament. The compatibility in the case of ligament injuries was 31 percent. 48 patients had dislocation of the patella, and a displaced osteochondral fragment was seen in 19, 14 of which were radiographically silent. In 37 cases of distortion of the knee a correct diagnosis would have been missed unless arthroscopy had been performed. Arthroscopy is therefore indicated in children with severe distortion of the knee, hemarthrosis and with dislocation of the patella.     

Lateral femoral condyle osteochondral fracture caused by a patella luxation: advantages and disadvantages of PLA fixation

A lateral patella luxation is occasionally complicated by an (osteo)chondral fracture. These fractures are usually located at the inferomedial part of the patella. In this case report we describe an osteochondral fracture of the lateral femoral condyle after a dislocation of the patella. The latter is a more severe injury because it involves an important weight bearing part of the knee joint. Refixation of the osteochondral fracture should be pursued. Various surgical techniques using nonresorbable materials have been described. We describe the advantages and disadvantages of refixation with biodegradable pin fixation for an osteochondral fracture caused by a patellaluxation.     

Locked lateral patellar dislocation with impaction fracture of patella

Irreducible lateral patellar dislocation is rare. It has previously been described with rotation around a vertical axis. We describe a case of irreducible lateral patellar dislocation in a 66-year-old lady with an impaction fracture of medial facet of patella locked on the lateral femoral condyle. Closed reduction was unsuccessful and the patient was treated by total knee replacement. Such a case has not been described previously in the literature.     

Vertical axis patellar dislocation with ipsilateral femoral fracture: use of a closed percutaneous technique for reduction of the dislocation

Intra-articular vertical axis dislocations are rare injuries, which mostly occur after blunt trauma. In this type of dislocation, the patella rotates along its vertical axis, bringing the articular surface to face medially or laterally. A 13-year-old boy sustained an intra-articular lateral patellar dislocation with a 90 degrees vertical axis medial rotation, which resulted in the articular surface facing laterally, the medial edge of the patella pointing posteriorly, and the lateral edge of the patella pointing anteriorly. As a result, the patella was wedged between the medial and lateral femoral condyles. He also sustained an ipsilateral closed distal femoral shaft fracture. Closed reduction of the dislocation was not successful. Subsequently an A-O reduction clamp was used percutaneously to reduce the patellar dislocation. The femoral fracture was then stabilized by internal fixation using a dynamic compression plate. Isolated vertical and horizontal dislocations have been previously described, but the presence of an ipsilateral femoral shaft fracture makes this a unique case. The percutaneous method used for reduction of the patella has not been previously described. A focused review of the literature, pathoanatomy, and methods of treatment of this condition are presented.     

髌腱内移和髌内侧筋膜肌肉瓣外移治疗先天性髌骨脱位

目的评价髌腱内移和髌内侧筋膜肌肉瓣外移术治疗先天性髌骨脱位的效果。方法自1994年6月～1998年6月,采用髌腱内移和内侧筋膜肌肉瓣外移的方法治疗先天性髌骨脱位5例,男2例,女3例,平均年龄7岁(4～10岁)。4例为单侧髌骨脱位,1例为双侧(只治疗一侧),均未合并其它畸形。结果术后随访1.5～5年,平均3年,无手术并发症,无术后再脱位和半脱位。4例膝关节能完全伸直,1例差10°;2例膝外翻消失;1例10岁女童术后出现髌骨低位,但膝外翻消失、功能正常且伸膝有力。结论先天性髌骨脱位是一种持续、不可复性脱位,需手术治疗。髌内侧筋膜肌肉瓣外移和髌腱内移术操作简单,损伤较小,并发症少,效果优良,是一种值得推荐的手术方法。     

Patellaluxationen

Dislocation of the patella represents a frequent knee problem in childhood and adolescence. There are traumatic, recurrent, habitual and chronic forms. Many anatomical variations, which promote patellar dislocation, are known. The first traumatic dislocation is primarily treated conservatively with the exception of concomitant osteochondral fragments or very large soft tissue damage which justify surgical interventions. Recurrent, habitual and chronic dislocations are best cured surgically by vastus medialis advancement, reconstruction of the medial patellofemoral ligament, strengthening of the medial retinaculum together with a lateral release and by fixation of the patella using tendon grafts or medialisation of the insertion of the patellar ligament. To improve the femoropatellar groove by trochleoplasty is a different surgical concept. The long-term results following medialisation of the patellar ligament insertion or trochleoplasty are good with regards to patellar stability but mediocre in terms of avoiding degenerative changes in the patellofemoral joint.     

经骨缝合手术治疗急性髌骨脱位合并髌骨软骨Peeloff损伤早期疗效观察

目的评价经骨缝合手术治疗急性髌骨脱位合并髌骨软骨骨折(Peeloff损伤)的早期临床疗效。方法回顾性分析自2019-05—2020-03诊治的15例急性髌骨脱位合并髌骨软骨Peeloff损伤,膝关节镜检查并确诊髌骨软骨缺损,关节腔内找到与缺损区域吻合的游离软骨片,关节镜下或内侧小切口取出游离软骨片;再作髌内侧切口,将游离软骨片复位并在其边缘选取4个合适进针点,用带孔克氏针在髌骨主体上从内向外垂直钻孔,每两孔之间导入可吸收缝线,经孔道将克氏针抽出时带出缝线并打结。结果 15例均获得随访,随访时间平均8(3~13)个月。术后3个月MRI显示所有患者髌骨关节面软骨骨折均愈合。2例出现早期髌股关节疼痛(1例VAS评分为4分,1例VAS评分为5分),经康复治疗后好转,其余13例疼痛VAS评分平均1.8(1~3)分。末次随访时Tegner运动评级:3级5例,4级9例,5级1例。末次随访时膝关节功能Lysholm评分80~96(88.9±4.7)分,其中优6例,良7例。结论关节镜下探查可确诊急性髌骨脱位合并的髌骨软骨Peeloff损伤,采用可吸收缝线经骨缝合固定髌骨关节面软骨片无需特殊内固定器械及二次手术取出,既能实现软骨稳定固定、正常愈合,又能保证膝关节功能良好恢复。     

Arthroscopic repair of the medial retinaculum and capsule in acute patellar dislocations

Treatment for acute dislocations of the patella is highly controversial among many knee surgeons. This study proposes an arthroscopic technique for the surgical repair of the retinacular-capsular defects caused from acute patellar dislocation. The clinical material used involved 30 cases with no previous history of patellar instability and with history of documented lateral dislocation accompanied by an acute hemarthrosis. All individuals in this study were treated with arthroscopic medial capsular-retinacular repair and lateral retinacular release. The follow-up on these patients, ranging from 1 to 7 years postoperatively, revealed that the results of treatment were gratifying in all instances with the exception of one traumatic redislocation. It appears that the arthroscopic procedure used in this study was successful in stabilization of the acute dislocation of the patella, and that it is a beneficial addition to present surgical treatment for the acute dislocation of the patella. This technique provides early accurate diagnosis and, thus, early accurate restoration of normal anatomy. This technique is by no means the only way, but it is one way to obtain satisfactory results in the treatment of this most difficult problem.     

髌股关节发育不良对髌骨脱位磁共振成像表现的影响

背景：当存在髌股关节发育不良时,髌骨脱位的损伤程度较轻,因此更加依赖影像学诊断。 目的：比较髌股关节发育不良患者和髌股关节发育正常患者髌骨脱位时磁共振成像（MRI）表现的异同。 方法：回顾性分析54例经临床证实的髌骨脱位患者的MRI影像学资料。髌股关节发育不良患者32例,髌股关节发育正常患者22例。记录患者MRI中髌骨内侧骨挫伤或撕脱骨折、髌骨关节面骨软骨骨折、股骨外侧髁外侧部骨挫伤、髌股内侧支持带撕裂等情况。 结果：髌股关节发育不良组的32例患者中,髌骨内缘骨折12例,内侧支持带损伤10例,髌骨软骨损伤7例,股骨外髁骨挫伤18例;髌股关节发育正常组的22例患者中,髌骨内缘骨折8例,内侧支持带损伤14例,髌骨软骨损伤14例,股骨外髁骨挫伤14例。两组在内侧支持带损伤和髌骨内缘骨折上有显著统计学差异（P＜0.05）。 结论：MRI可以较好地诊断髌骨脱位。当髌股关节发育不良时,内侧支持带损伤和髌骨内缘骨折的发生率降低。     

Dislocation of the knee with lateral dislocation of the patella. A report of four cases

In a group of 25 patients with traumatic dislocation of the knee, four, all of whom had similar ligament and medial soft-tissue injuries, also had associated lateral patellar dislocation. In all four reconstruction was delayed because of their other serious injuries. Having encountered the combination of knee dislocation and lateral patellar dislocation in 16% of our patients, we believe that it may be less rare than is commonly believed. We think that it is important to maintain a high index of suspicion of possible patellar dislocation when medial structures have been severely damaged. Early recognition and immobilisation in extension can prevent fixed lateral dislocation of the patella.     

关节镜辅助下小切口微创治疗急性髌骨脱位

目的探讨关节镜辅助下小切口微创治疗急性髌骨脱位的方法和疗效。方法 2008年7月至2011年9月,我科收治急性髌骨脱位14例,男9例,女5例;年龄16~28岁,平均(21.8±5.3)岁。患者入选条件:所有患者均有明确膝关节暴力外伤史,排除关节松弛和髌股关节发育异常。从发生髌骨脱位到手术的时间间隔为3~14 d,平均5.6 d。术中先行关节镜检查并清理关节腔内积血和处理关节软骨损伤后,在髌骨内侧做1个1.5 cm长纵行小切口,通过上下推移皮肤,在髌骨中上部拧入带线锚钉,使用过线方法折叠缝合髌内侧支持带,视髌骨复位情况行外侧支持带松解。结果 14例患者获得随访,术后随访24~60个月,平均36.1个月。全部病例未再次发生脱位,恐惧试验全部阴性。关节活动度均在正常范围,3例关节早期过屈时有轻度紧张感,随访患者均恢复伤前的生活状态。所有病例均未出现重度髌股关节退行性改变。结论关节镜辅助下小切口治疗急性髌骨脱位安全、可行,疗效显著。     

Begutachtung der Patellarandschäden

In addition to the typical patellar fractures in adulthood, which are mostly due to collision trauma, marginal damage to the patella can also occur as a result of ossification disorders (apophysis equivalent, patella partita) as well as so-called stress fractures, sleeve fractures, tendon avulsion fractures in adolescence and medial marginal avulsion of the patella by patellar dislocation.