EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Youssef et al DISTAL FEMUR FRACTURES TREATED WITH PLATE FIXATION: TO LOCK OR NOT TO LOCK By Ahmed Omar Youssef*, Nagy A. Sabet**, Ahmed Saleh Abd El-Fattah*, Mohamed Mohamed E-Shafie* Department of Orthopedic Surgery and Traumatology *Minia Faculty of Medicine **Misr University for Science and Technology ABSTRACT: Introduction: The objective of this study was to compare postoperative results and functional outcomes of distal femur fractures treated with non-locking and locking condylar plate fixation. Materials and methods: Thirty-seven patients with distal femur were treated from January 2005 to June 2008 and 34 of them met the inclusion criteria of this study. They were randomly divided into two groups, based on the method of treatment. Group I comprised 20 patients (14 men, 6 women) who had 20 distal femoral fractures managed by condylar buttress plate. Group II consisted of 14 patients (10 men, 4 women) who had 14 distal femoral fractures managed by LCP condylar plate. Results: The average duration of follow-up was 15 months (range 6–36 months). Both groups were similar in mean age, gender distribution, mechanisms of injury, fracture type and open fracture grade. The mean HSS score was 75.8 (range 53–90) in group I and 77.1 (range 60–95) in group II. There was no significant difference with regard to HSS scores between two groups (p=0.7055). According to the criteria set by Schatzker and Lambert, excellent results were recorded in 5, good in 11, moderate in 1, poor in 3 patients with group I and excellent in 4, good in 9 and poor in 1 patient with group II. The complications that occurred in the group I were one stiffness of the knee (mean flexion 55°), two varus deformity 20°, one non-union with plate failure, three delayed-union, and in the group II one stiffness of the knee (mean flexion 60°) due to severe osteoarthritis and one delayed-union. Conclusion: Comparison of non-locking versus locking condylar plates showed that locking plates: required fewer bone grafts; had less surgical complications; had similar percentages of immediate postoperative malaligned cases; were more stable for long-term alignment; and had better clinical and functional outcomes. Considering this, in our practice the locking plate have become the preferred option especially in severe type 33-C2, 3 distal femur fractures. KEYWORDS: Distal femur fracture Locked and non-locked condylar plate. open fracture and poor bone quality may decrease the stability of fixation.1 INTRODUCTION: The treatment of comminuted, intra-articular distal femoral fractures is challenging. Many of these injuries are the result of high-energy trauma, which generates severe soft-tissue damage and articular and metaphyseal comminution. Bone loss resulting from Traditional devices for internal fixation have included the 95° condylar blade-plate, the dynamic condylar screw with a 95° side-plate, and intramedullary nails. However, coronal 359 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 fractures or extensive distal comminution may preclude the use of these devices. In such cases, a lateral buttress or neutralization plate may be used.2 Youssef et al assistance before injury. Exclusion criteria for this study were: (1) old fractures (definitive surgery more than 3 weeks after the injury) and pathological fractures except osteoporosis; (2) severe open fractures (Gustilo IIIB and IIIC). Thirty-four patients who met these criteria were randomly divided into two groups, based on the method of treatment. The condylar buttress plate was the first implant designed to serve this function. Unfortunately, when this device is applied in the presence of medial comminution or bone loss, failure of fixation and varus collapse may eventually result.3, 4 Group I comprised 20 patients (14 men, 6 women) who had 20 distal femoral fractures managed by condylar buttress plate. The types of fracture were four A1, three A2, two A3, four C1, three C2, and four C3 according to the AO/OTA classification (Fig. 1). The average time from the accident to operation was 7 days (range 0–12 days). The causative factors were highspeed motor-vehicle accidents in 11 cases, fall from a height in 3 cases and simple fall on flexed knee in 6 cases. Of the 20 fractures, 2 were open; and one of them was grade I and the other one was grade II. Recent advances in technology for the treatment of distal femoral fractures include the Locking Compression Plate (LCP) condylar plate (Synthes). This implant offer multiple points of fixed-angle contact between the plate and screws in the distal part of the femur, theoretically reducing the tendency for varus collapse that is seen with traditional lateral plates. Early clinical studies of the (LCP) have demonstrated a high frequency of fracture union with low rates of malalignment. 5-8 Group II consisted of 14 patients (10 men, 4 women) who had 14 distal femoral fractures managed by LCP condylar plate. The types of fracture were two A1, one A2, two A3, two C1, three C2, and four C3 according to the AO/OTA classification. The average time from the accident to operation was 8 days (range 0–15 days). The causative factors were high-speed motor-vehicle accidents in 8 cases, fall from a height in 3 cases and simple fall on flexed knee in 3 cases. Of the 14 fractures, 1 was open grade IIIA. This study was undertaken to compare postoperative results and functional outcomes of distal femur fractures treated with non-locking and locking condylar plate fixation. PATIENTS AND METHODS: From January 2005 to June 2008, 37 consecutive patients with distal femur fractures were operatively treated in our hospital. Inclusion criteria for this study were: (1) acute and unilateral fractures; (2) patients with the ability to walk without any 360 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Youssef et al Fig. 1: AO/OTA Classification of fractures of distal femur described by Müller et al, 1991. 9 inserted. At least four screws were utilized for each main fragment. Primarily iliac bone grafting was performed in 3 cases with type C fractures in group one. Limb length, rotation, and axes were determined using clinical and fluoroscopic techniques. Then suction drains were placed before wound closure. Surgical technique: Surgery was performed with the patients in supine position on a standard operating table that allowed imaging of the knee with a C armed image intensifier. Knee flexion was achieved by placing a sterile towel pillow under the knee. Tourniquet was used in most of cases. The anterolateral approach was performed with lateral parapatellar extension for type C fractures. Then the femoral condyles were reduced and temporarily fixed with K wires. A proper length condylar plate (either non locked or locked) was All patients were routinely given a first-generation cephalosporin (cefazolin) and aminoglycosides (gentamicin) for 48 h starting just before the induction of anesthesia. 361 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Continuous passive motion (CPM) and physiotherapy with active/passive motion were started soon after removing the suction drains on the second postoperative day. All patients were followed at 6-week intervals during the first 6 months postoperatively and then at 3-month intervals until final recovery. Youssef et al used to grade and compare the results between the two groups (Table 1). Knee function evaluation was performed according to Hospital for Special Surgery Knee score (HSS score).11 All data analysis was conducted on a personal computer using the SPSS software package (SPSS Inc., Chicago, Illinois). A chi-square test was used for categorical variables between the two groups, such as sex, etc. A Student t test was used for continuous variables, such as age and range of motion. A value of P < 0.05 was considered to be statistically significant. During the follow-up period, fracture healing time and postoperative complications were recorded. Plain films during the immediate postoperative and subsequent follow-up period were reviewed for all patients. Schatzker and Lambert criteria10 were Table 1: Schatzker and Lambert criteria for functional assessment.10 Excellent—full extension: Flexion loss less than 10º. No varus, valgus or rotatory deformity. No pain. Perfect joint congruency Good—not more than one of the following: Loss of length not more than 1.2 cm. Less than 10º varus or valgus. Flexion loss not more than 20º. Minimal pain. Moderate—any two of the criteria in Good category. Poor—any of the following: Flexion to 90º or less. Varus or valgus deformity exceeding 15º. Joint incongruency. Disabling pain no matter how perfect the X-ray. group with an average duration of follow-up of 18 months. RESULTS: The average duration of followup was 15 months (range 6–36 months). The patients treated with locking plates had a shorter duration of follow-up, with an average of 9 months, compared to the non-locking Injury characteristics Both groups were similar in mean age, gender distribution, mechanisms of injury, fracture type and open fracture grade (Table 2). 362 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Youssef et al Table 2: Demographic data and injury characteristics of the patients. Mean age (years) Group I (n=20) 44.2 (range 21-65) Gender Male Female Mechanism of injury High speed motor-vehicle accident fall from a height Fall on flexed knee AO/OTA classification Type A (No) A1 A2 A3 Type C (No) C1 C2 C3 Open fracture grade (No) Gustilo type I Gustilo type II Gustilo type IIIA Group I: condylar buttress plate group. Group II: LCP condylar buttress plate group. No: number of patients. a Student's t-test. b Chi-squared test. Group II (n=14) 45.9 (range 23-82) P-value 0.7766 a 1.0000b 14 6 10 4 1.0000b 11 3 6 8 3 3 0.7282 b 9 4 3 2 11 4 3 4 2 1 1 0 5 2 1 2 9 2 3 4 1 0 0 1 1.0000b immediate internal fixation within 6 hours from injury. Surgical management Twenty-six cases (76.5%) were operated on within the first 5 days after the fracture was sustained. Two open cases had surgery delayed due to temporary external fixation (for 12 and 15 days) prior to internal fixation. The delay in surgery of more than 5 days for the remaining six cases was due to associated co-morbidities and other injuries. Primary iliac bone graft were needed in 3 cases in group I with severe comminuted osteoporotic fractures (type C2 and C3), which was not needed in group II. Operative time (skin incision to closure) ranged between 90 minutes and 160 minutes with no significant difference between the two groups (p=0.3577). Least operative time was in simple non-comminuted fractures and longest operative time was in highly comminuted fractures; needing Two out of three cases of open fractures (grade II and IIIA) were managed by temporary external fixation prior to internal fixation. The third case (grade I) managed by 363 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 larger exposure technique, more time for reduction and alignment of comminuted fragments. Also, there were no significant difference between Youssef et al the two groups as regard peri-operative blood loss and hospital stay (P . (Table 3) Table 3: Surgical details. Group I (mean±SD) Surgical time (min) 119.0 ± 22.7 Peri-operative blood loss (mL) 370.0 ± 96.5 (range 200-500) Primary bone graft (No) 3 Immediate postoperative 1 malalignment (No) (varus 5°) Hospital stay (days) 10.8 ± 9.9 (range 5-35) Group I: condylar buttress plate group. Group II: LCP condylar buttress plate group. No: number of patients. * Statistical significance was detected. a Student's t-test. b Chi-squared test. Group II (mean±SD) 126.4 ± 23.1 400.0 ± 103.8 (range 200-550) 0 1 (varus 5°) 11.4 ± 9.1 (range 5-28) P-value 0.3577a 0.3935 a 0.2513 b 1.0000b 0.8514 a The mean HSS score was 75.8 (range 53–90) in group I and 77.1 (range 60–95) in group II. There was no significant difference with regard to HSS scores between two groups (p= 0.7055). The mean range of knee motion was 105.5 (range 5–125) in group I and 112.5 (range 60–125) in group II. There was no significant difference with regard to range of knee motion between two groups (p= 0.3270). Radiographic assessment Assessment of the fracture in terms of valgus/varus alignment on postoperative radiographs showed correct axial alignment (<5° deviation compared to the anatomical axis in both planes) in 32 patients. Only 2 patients had 5° varus alignment, one in each group. Follow-up x-ray showed 20° varus collapse in two patients in group I. (Table 3, 4) Clinical evaluation Based on the criteria proposed by Schatzker and Lambert, the outcomes were assessed as excellent in 5 cases, good in 11, moderate in 1, and poor in 3 in group I and as excellent in 4, good in 9, and poor in 1 in group II. The poor results of group I were because of 20° varus deformity in 2 cases and stiff painful knee due to deep infection in one case. Complications Three cases in the non-locking plate group developed superficial infection treated with oral antibiotics. Also, one case develop deep infection treated by debridement end in painful stiff knee. This complication was not recorded in the locking plate group. Twenty degrees varus collapse develop in 2 cases in group I detected 364 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 in follow-up x-ray done after 6 weeks. Secondary iliac bone graft for delayedunion was needed in 3 cases in group I and one case in group II. Non-union and plate failure occurred in one case Youssef et al in group I managed by revision with locked plate and bone graft. Three patients had subsequent removal of hardware (all non-locking plates) due to pain. Table 4: Post-operative outcomes and complications. Radiographic healing time (weeks) Union rate (%) Total arc of knee motion (degrees) Mean HSS knee score (points) Group I (n=20) 18.0 ± 9.95 (range 12-48) 95 105.5 ± 22.7 (range 55-125) 75.8±10.8 (range 53-90) Functional outcome according to Schatzker and Lambert: 5 Excellent 11 Good 1 Moderate 3 Poor Complications (No) Infection 3 Superficial infection 1 Deep infection 2 Varus collapse (20°) 3 Delayed union (need secondary bone graft) 1 Plate failure and nonunion (revision and bone graft was done) 3 Painful plate Group I: condylar buttress plate group. Group II: LCP condylar buttress plate group. No: number of patients. * Statistical significance was detected. a Student's t-test. b Chi-squared test. 365 Group II (n=14) 16.9 ± 6.5 (range 12-38) 100 112.5 ± 15.8 (range 60-125) 77.1±9.9 (range 60-95) P-value 0.7087 a 1.0000 b 0.3270a 0.7055a 0.3786 b 4 9 0 1 0 0 0 1 0 0 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Youssef et al Figs. 2-A and 2-B: A sixty-year-old man was involved in a high-speed motor-vehicle accident. Fig. 2-A: Anteroposterior and lateral radiograph on the left knee showing fracture distal femur AO/OTA classification type 33-C3. Fig. 2-B: Follow-up anteroposterior and lateral radiograph after fixation by condylar buttress plate, made at six months, demonstrating fracture-healing without loss of reduction and without varus collapse. Figs. 3-A and 3-B: A twenty-two-year-old man was injured due to fall from a height. Fig. 3-A: Anteroposterior and lateral radiograph on the left knee showing fracture distal femur AO/OTA classification type 33-C1. Fig. 3-B: Follow-up anteroposterior and lateral radiograph after fixation by condylar buttress plate, made at twelve months, demonstrating fracture-healing without loss of reduction and without varus collapse. 366 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Youssef et al Figs. 4-A and 4-B: A fifty-five-year-old woman was involved in a high-speed motorvehicle accident. Fig. 4-A: Anteroposterior and lateral radiograph on the right knee showing fracture distal femur AO/OTA classification type 33-C2. Fig. 4-B: Followup anteroposterior radiograph after fixation by condylar buttress plate, made at three months, demonstrating 20° varus collapse. Fig. 5: A sixty-five-year-old woman was involved in a high-speed motor-vehicle accident. Follow-up anteroposterior and lateral radiograph on the right knee showing fracture distal femur AO/OTA classification type 33-C3 associated with fracture patella. The condylar buttress plate was broken and revision surgery was needed. Figs. 6-A through 6-C: A sixty-five-year-old woman was involved in a high-speed motor-vehicle accident. Fig. 6-A: Anteroposterior and lateral radiograph on the right knee showing fracture distal femur AO/OTA classification type 33-C3. 367 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Youssef et al Fig. 6-B: Follow-up anteroposterior and lateral radiograph after fixation by LCP condylar buttress plate, made at twelve months, demonstrating fracture-healing without loss of reduction and without varus collapse. Fig. 6-C: Follow-up photograph of the patient showing good range of knee flexion and extension. Figs. 7-A and 7-B: A seventy-year-old man was injured due to fall on flexed knee. Fig. 7-A: Anteroposterior and lateral radiograph on the left knee showing fracture distal femur AO/OTA classification type 33-A1. Fig. 7-B: Follow-up anteroposterior and lateral radiograph after fixation by LCP condylar buttress plate, made at twelve months, demonstrating fracture-healing without loss of reduction and without varus collapse. But the patient had severe osteoarthritis associated with pain and stiffness. 368 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 Youssef et al advantage of locked plating systems. In fact, the “hybrid” plating technique, as initially described by Ricci et al.17 and later studied by Freeman et al. 18 utilizes nonlocked screws to compress the plate against the bone. The plate contour is used as a reduction aid and then locked screws are used to obtain improved biomechanics. This locked/ nonlocked screw combination is now becoming standard technique. DISCUSSION: Internal fixation options for fractures of the distal femur, usually caused by high-energy trauma, are a 95° blade plate, dynamic condylar screw (DCS), and condylar buttress plate. With these techniques, higher complications rates due to postoperative infection and nonunion are not uncommon during the treatment because of additional soft tissue and blood supply damage especially in comminuted fractures.2, 12 Although locked plating technology is not always necessary, it is often indicated for complex metaphyseal fractures of the distal femur, proximal tibia, distal tibia, or supracondylar region of the distal humerus and radius. These fractures are often comminuted and commonly occur in elderly patients with osteoporotic bone. As of yet few prospective studies exist that definitively demonstrate superiority of locked plating in difficult metaphyseal or osteoporotic fractures. Nonlocked plates, dependent on friction for stability, must be coupled with adequate screw purchase. Osteoporotic bone often cannot achieve the torque necessary to maintain such construct stability, making locked plating applications in osteoporotic bone particularly advantageous. 19 The development of fixed-angle locking plates has altered the mainstay of internal plate fixation; however there is minimal data on longer-term follow-up of patients treated with locking plates, particularly with respect to functional outcomes13, 14. Expectations for superior performance for locked plating fixation, based on preliminary biomechanical data, rests on 3 observations: (1) a single beam construct design is better maintained for locked plating and is less dependent on bone quality than for nonlocked plating therefore providing superior stability, (2) the design of locked constructs permits a reduced need for bone/plate friction, which minimizes biologic insult, and (3) the locked plate construct resists varus/valgus collapse of end segment fractures. 15 Seven out of the 20 cases treated with non-locking condylar buttress plate had bone grafting compared with only 1 out of 14 cases treated with LCP condylar buttress plate, and 10 cases in the non-locking plate group had direct complications related to the surgery, compared with one in the locking plate group. Three of the nonlocking plate group had subsequent removal of hardware due to pain, compared with none in the locking plate group. The development of locked plating was fueled by the failure of traditional compression methods to provide fracture stability while still preserving blood supply to bone. Early fixed-angle plate systems evolved out of the goal to reduce plate contact with the periosteum.16 However, it is now evident that the biologic advantage of reduced contact of plate to bone is only one The smaller groups number makes it difficult to draw statistically 369 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 significant conclusions from these results and a larger study would be required to adequately compare the need for bone grafting and the risk of surgical complications. Youssef et al fracture of the femur. J Bone Joint Surg Am. 1989, 71: 95-104. 3. Bolhofner BR, Carmen B, Clifford P. The results of open reduction and internal fixation of distal femur fractures using a biologic (indirect) reduction technique. J Orthop Trauma. 1996; 10: 372-7. 4. Mast J, Jakob R, Ganz R. Planning and reduction technique in fracture surgery. New York: Springer; 1989. 5. Egol KA, Kubiak EN, Fulkerson E, Kummer FJ, Koval KJ. Biomechanics of locked plates and screws. J Orthop Trauma. 2004; 18: 488-93. 6. Frigg R. Development of the locking compression plate. Injury. 2003; 34 Suppl 2: SB6-10. 7. Sommer C, Gautier E, Muller M, Helfet DL, Wagner M. First clinical results of the Locking Compression Plate (LCP). Injury. 2003; 34 Suppl 2: B43-54. 8. Stoffel K, Dieter U, Stachowiak G, Gachter A, Kuster MS. Biomechanical testing of the LCP— how can stability in locked internal fixators be controlled? Injury. 2003; 34 Suppl 2: SB11-9. 9. Muller ME, Allgower M, Schneider R. Manual of internal fixation: techniques recommended by the AO/ASIF Group, 3rd edn. Springer, Berlin Heidelberg New York, 1991. 10. Schatzker J, Lambert DC. Supracondylar fractures of the femur. Clin Orthop. 1979; 138: 77–83. 11. Insall JN, Ranawat CS, Aglietti P, Shine J.A comparison of four models of total knee-replacement prostheses. J Bone Joint Surg Am 1976; 58(6): 754-65. The percentages of immediate postoperative malaligned cases were similar between the non-locking and locking plate groups (one case in each group). In the non-locking plate group the degree of malalignment generally worsened with serial imaging, indicating progressive bony collapse and failure to maintain reduction. Since progressive loss of reduction was only identified in the non-locking plate group, it is clear that locking plates provide more stable long-term fixation. CONCLUSION: Comparison of non-locking versus locking condylar plates shows that locking plates: required fewer bone grafts; had less surgical complications; had similar percentages of immediate postoperative malaligned cases; were more stable for long-term alignment; and had better clinical and functional outcomes. Considering this, in our practice the locking plate have become the preferred option especially in severe type 33-C2, 3 distal femur fractures. Obviously, a larger study with age-matched, fracture classifycation-matched and health statusmatched groups might identify statistically significant superior functional outcomes in the locking plate group. REFERENCES: 1. Zlowodzki M, Bhandari M, Marek DJ. Operative treatment of acute distal femur fractures: systematic review of 2 comparative studies and 45 case series (1989 to 2005). J Orthop Trauma. 2006; 20: 366-371. 2. Siliski JM, Mahring M, Hofer HP: Supracondylar-intercondylar 12. Huang HT, Huang PY, Su JY, Lin SY. Indirect reduction and bridge plating of supracondylar fractures of the femur. Injury 2003; 34: 135–40. 370 EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 13. Wang JW, Weng LH. Treatment of distal femoral nonunion with internal fi xation, cortical allograft struts, and autogenous bonegrafting. J Bone Joint Surg Am 2003; 85: 436–40. 14. Chapman MW, Finkemeier CG. Treatment of supracondylar nonunions of the femur with plate fi xation and bone graft. J Bone Joint Surg Am 1999; 81: 1217–28. 15. Soileau R, Cartner J, Zheng Y. Locked Versus Conventional PlateScrew Fixation in Osteoporotic Bone: A Review. Techniques in Orthopaedics 2007; 22(4): 247–252. 16. Farouk O, Krettek C, Miclau T, et al. Minimally invasive plate osteosynthesis: does percutaneous plating disrupt femoral blood supply less than the traditional technique? J Orthop Trauma 1999; 13: 401– 406. Youssef et al 17. Ricci WM, Loftus T, Cox C, et al. Locked plates combined with minimally invasive insertion technique for the treatment of periprosthetic supracondylar femur fractures above a total knee arthroplasty. J Orthop Trauma 2006; 20: 190 –196. 18. Freeman AL, Tornetta P, Schmidt A, et al. How much does the addition of locked screws add to the stability of hybrid plate constructs in osteoporotic bone? J Orthop Trauma 2007. 19. Leung F, Chow S. A prospective, randomized trial comparing the limited contact dynamic compression plate with the point contact fixator for forearm fractures. J Bone Joint Surg Am 2003; 85: 2343– 2348. 371 Youssef et al EL-MINIA MED. BULL. VOL. 20, NO. 1, JAN., 2009 التثبيت بواسطة الشرائح لكسور أسفل عظمة الفخذ: استخدام الغلق أو عدم أستخدامة تهدف هذه الدراسة مقارنة نتائج كسور أسفل الفخذذ ااسذتخداا اليذر اة الدا مذة ليقمتذ والير اة ذات ة الغيذ .يذميا الدراسذة سذاثة ون نذ مر عذا و ثذانو مذ كسذور أسذفل مذة الفخذذ يذذل الفتذر مذ نذا ر 2005ا إلذذي ون ذذو 2008ا انطاقذا يذذروط الدراسذة يذذي أراثذذة ون ن منها وقد تا تقس مها إلي مجمو ت ااسب طر قة الث ج المجمو ة األولل تتكو م ير مر عا و ( 14ذكر و 6إناث) وتا جها اواسطة الير اة الدا مة ليقمت والمجمو ة النان ة تتكو م أراثذة يذر مر عذا و ( 10ذكذور و 4إنذاث) قذد كذا متوسذط الثمذر والجذن وآل ذذة اذذدوث اة ذذااة ونو ذذة الكسذذر واالتذذ م ذ ا ذذث كسذذر مفتذذوي أو مغيذذ .متقاراذذا و يذذل المجمو ت كا متوسط مد المتااثة خمسة ير يهرا و ( م 36 – 6يهر ) وتا تق ا النتائج اطر قة ياتذكر ولمارا وكانا النتائج ممتاز يذل خمذ اذاوا وج ذد يذل أاذد يذر االذة ومتوسطة يل االة وااد وس ئة يل ن ث ااوا يل المجمو ة األولل وكانا ممتاز يل أراثة ااوا وج د يل تسثة ااوا وس ئة يل االة وااد يل المجمو ذة النان ذة وكانذا معذا فاا المجمو ة األولل ت ا االركاة يل االة وااد واالت تقو االساق ليذداخل 20درجذة واالذة دا التئاا اساب ييذل اليذر اة ون نذة اذاوا تذيخر يذل اولتئذاال ويذل المجمو ذة النان ذة االذة وااد ت ا االركاة نت جة خيونة يد د امف ل الركاة واالة تيخر التئاا الخالصة : أ المقارنة ا الير اة الدا مة ليقمت ذات ة الغي .وغ ر ذات ة الغي .ل ا نا أ اليرائح ذات ذة الغي .نادرا و ما تاتاج إلي رقثة م ة وأقذل مذ ا ذث المعذا فاا الجراا ذة وكانذا اليذر اة ذات ة الغي .أكنر نااتا و وأقل ادونا و لتقو الركاة يذي المذد الطو ذل وايخذذ ذلذي يذل او تاذار يإ الير اة ذات ذة الغيذ .أ ذااا هذل اوخت ذار األيعذل يذل ذ ج كسذور أسذفل مذة الفخذذ وخا ة تيي الكسور المتداخية مع مف ل الركاة 372