THE KNEE IN CEREBRAL PALSY: CURRENT MANAGEMENT FROM LESSONS LEARNT THROUGH THREE DIMENSIONAL GAIT ANALYSIS[1]
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1 THE KNEE IN CEREBRAL PALSY: CURRENT MANAGEMENT FROM LESSONS LEARNT THROUGH THREE DIMENSIONAL GAIT ANALYSIS[1] H Kerr Graham 1,2,3, Paulo Selber 2, Jill Rodda 1, Jeffrey Young 2 1 Murdoch Childrens Research Institute, Royal Children s Hospital, Melbourne, Australia. 2 The Department of Orthopaedics, Royal Children s Hospital, Melbourne, Australia, 3 The University of Melbourne, Melbourne, Australia. INTRODUCTION Orthopaedic priorities by topographic classification Hemiplegia: Foot/Ankle: equinus, equinovarus, equinovalgus. Diplegia: Knee: sagittal plane balance for walking. Quadriplegia: Spine/Pelvis/Hip: sitting balance THE EVALUATION Diagnostic Matrix Davids et al [2] information is gathered from the following five sources (Figure 1): 1. Clinical history: GMFCS, FMS, FAQ 2. Physical examination 3. Instrumented gait analysis 4. Special investigations including radiology 5. Examination under anesthesia Figure 1: Diagnostic Matrix 1
2 Physical Examination Of The Knee Muscle spasticity (R1 vs. R2) Muscle Contracture Knee Joint Contracture Popliteal angle Duncan Ely/Prone rectus Fixed Flexion Deformity Gait Analysis Understanding the gait pattern and the interrelationship of the hip, knee, and ankle helps guide treatment 4 Sagittal Knee Patterns: Sutherland and Davids[3]: 1) Jump Knee increased knee flexion in early stance; normal knee extension in late stance 2) Crouch increased knee flexion and ankle dorsiflexion in stance 3) Stiff Knee decreased knee flexion in swing 4) Recurvatum Knee excessive knee extension in stance 4 Sagittal Gait Patterns: Rodda and Graham[4] (Figure 2): 1) True equinus hip normal; knee normal; ankle equinus 2) Jump Gait hip normal; knee flexed; ankle equinus 3) Apparent Equinus hip/knee flexed; ankle plantigrade 4) Crouch Gait hip/knee flexed; ankle dorsiflexed Figure 2: Four sagittal gait patterns in spastic diplegia Rodda and Graham[4]. 2
3 KNEE INTERVENTIONS IN SPASTIC DIPLEGIA Non Operative Management Strengthening: Important component of management particularly o Post multilevel orthopaedic surgery (and even in preparation) o Mild cases of diplegia o Adolescence Short term: strength improves with isometric training[5, 6] Detraining occurs as early as six weeks after cessation of the program[6] The relationship between improved strength and gait is uncertain. Gait kinematics show wide variability following an eight week progressive resistance exercise program[7] Spasticity Management For Knee Dysfunction[8, 9]: Oral medications diazepam (Valium) for acute postoperative pain and spasm management. Not for chronic management. Botulinum Toxin A (BoNT A) targets specific muscle groups; o Hamstring injections Corry et al[10] Improves knee extension at initial contact six degrees Maximal knee extension in stance eight degrees Improvements no longer present at 12 weeks o defers multilevel orthopaedic surgery until an appropriate age Molenaers et al[11] o effective in the short term, but is never definitive Selective dorsal rhizotomy useful for severe hypertonia in carefully selected cases Intrathecal baclofen pump for generalized hypertonia Operative Management Flexed knee gait cannot be managed by a single approach. Applying the diagnostic matrix (clinical history, physical examination, gait analysis, radiology, and examination under anesthesia) helps determine the surgical dose. Distal Hamstring Lengthening Establishing whether the hamstrings are or are not short and contracted is paramount prior to undertaking any hamstring lengthening procedure as the prevalence of short, contracted hamstrings in spastic diplegia has been shown by studies using muscle length modeling, to be less frequent than previously thought[12]. A variety of techniques for hamstring lengthening are utilized: Semimembranosus lengthening by a number of circular stripes in the fascia over the distal muscle, followed by gentle extension of the knee, allows lengthening in continuity while preserving the underlying muscle and muscle function. Gracilis and semitendinosus lengthening by simple tenotomy, Z lengthening or intramuscular lengthening have been described. 3
4 Lateral hamstring lengthening in addition to medial hamstring lengthening is more controversial due to: Risk of knee recurvatum [13]. Risk if increased anterior pelvic tilt[14]. Presenters Preferred Method Less commonly performing isolated distal hamstring lengthening because the knee dysfunction is often too mild or too severe to benefit. We lengthen the medial hamstrings only, to minimize the risk of recurvatum and minimize the risk of increased anterior pelvic tilt. To maintain the integrity of the muscle tendon unit, the semimembranosus is fractionally lengthened with one or two circumferential stripes in the fascia, and the semitendinosus and gracilis are lengthened by intramuscular technique, similar to that described for the lengthening of the tibialis posterior[15] (figure 3B). We always use intramuscular tenotomy to preserve continuity and function. Now we almost never lengthen biceps femoris. Distal hamstring lengthening is combined with other procedures, such as a semitendinosus transfer, for mild to moderate degrees of fixed flexion deformity at the knee, greater than 5 degrees. 4
5 Figure 3: Schematic representation of knee interventions in spastic diplegia. A) For spastic muscle contracture, spasticity management may include botulinum toxin A injections (BoNT A), selective dorsal rhizotomy (SDR) and occasionally intrathecal baclofen (ITB). B) Fixed muscle contractures are addressed by medial distal hamstring lengthening. C,D) Useful tendon transfers include a rectus femoris transfer or semitendinosus transfer. E) Fixed knee flexion contracture may be addressed by supracondylar extension osteotomy and patellar tendon shortening. F) When growth is remaining, guided growth can be employed, applying 8 plates across the anterior distal femoral physis. 5
6 Rectus Femoris Transfer Distal hamstring lengthening in isolation improves knee extension during stance phase but results in decreased flexion during swing phase and increased stiffness[16]. This may result in clearance problems, toe scuffing and increased energy expenditure[17]. A solution to this problem is to combine medial hamstring lengthening with transfer of the rectus femoris. The indications include: GMFCS level the best results of rectus femoris transfer are in GMFCS I and II patients[18]. Rectus femoris spasticity confirmed by the Duncan Ely or prone rectus test [17, 19]. Kinematic variables including decreased peak knee flexion in swing phase[19], a decreased knee range of motion during swing phase[17, 20], a decreased overall knee range of motion during the gait cycle, and a delay in the timing of peak knee flexion[19]. Dynamic EMG showing prolonged rectus firing during swing phase [17, 20]. With respect to surgical technique: Distal rectus femoris transfer yields better results than either proximal or distal rectus femoris lengthening [20 22]. No evidence that one site of transfer is superior to another [23, 24]. Medially, the most commonly used recipient tendons for the rectus femoris transfer are the semitendinosus, the gracilis or the sartorius. Laterally, the iliotibial band has been used as a recipient tendon. Distal rectus femoris intramuscular lengthening has been recently described and the benefits found for patients requiring soft tissue surgery only, were maintained peak knee flexion and improved timing of peak flexion in swing phase and decreased knee flexion in stance[25]. Presenters preferred method We transfer the rectus femoris medially to the semitendinosus (figure 3C). A sound tendon to tendon transfer and secure repair allows early active and passive mobilization postoperatively. The proximal segment of semitendinosus is cross sutured to semimembranosus to preserve proximal hip extensor function. Sometimes indications are not clear and the rectus femoris transfer is delayed when: Clinical and kinematic indications for rectus femoris transfer are borderline. Anticipated immediate postoperative rehabilitation may be too complex for the child or the family to be sure of achieving a good result. There is concern of precipitating crouch gait in a child who already has an excessive knee flexion throughout stance phase. A second opportunity arises for rectus femoris transfer when internal fixation implants are removed, such as blade plates following a femoral osteotomy. If knee extension has been successfully restored, our preferred technique is then to transfer the rectus femoris laterally to the fascia lata. 6
7 Medial Hamstring Lengthening Combined with Semitendinosus Transfer to the Adductor Tubercle In the past, transfer of some or all of the hamstrings to the distal femur was described by Eggers and colleagues[26]. However, the procedure was abandoned when it was found that intractable recurvatum developed very quickly[27]. In order to improve knee extension without causing recurvatum, some centers transferred a single hamstring instead. The indications for semitendinosus transfer in our center include: Severe knee flexion throughout the stance phase. Fixed knee flexion deformity, five to 20 degrees, when examined under anesthesia. GMFCS level III or IV, and sometimes a young patient categorized as a GMFCS II with early fixed flexion contractures. Semitendinosus transfer is contraindicated in patients without a fixed knee flexion contracture given the high risk of recurvatum. Outcomes [28]: Fixed knee flexion deformity improved 15 degrees, from 18 degrees preoperatively to three degrees postoperatively. Knee flexion at initial contact improved by 17 degrees, from 39 degrees preoperatively to 22 degrees postoperatively. Minimum knee flexion during stance phase improved by 18 degrees, from 26 degrees preoperatively to 8 degrees postoperatively. Pelvic tilt did not deteriorate. Significant improvements were noted in the Functional Mobility Scores (FMS) at five and 50 meters. Presenters Preferred Method The semitendinosus is harvested distally from its attachment to the pes anserinus and transfer to the adductor magnus tendon. The procedure is performed in combination with conventional lengthening of the semimembranosus by fascial striping and an intramuscular lengthening of the gracilis (figure 3D). Semitendinosus transfer may exaggerate knee stiffness problems in swing. Our approach to this situation is to accept the short term knee stiffness. Once we think the correction of the sagittal plane is stable with no residual knee flexion deformity and good extension during stance phase, an isolated transfer of the rectus femoris to the fascia lata maybe considered. The benefits of combined distal medial hamstring lengthening and semitendinosus transfer can be augmented by guided growth, as described in a later section. Supracondylar Extension Osteotomy and Patellar Tendon Shortening Distal hamstring lengthening in the presence of knee flexion deformity of more than five to 10 degrees is ineffective and risks complications such as common peroneal nerve stretch injuries and increased anterior pelvic tilt. Correction of knee flexion deformity by a supracondylar extension 7
8 osteotomy(seo) in combination with patellar tendon shortening (PTS) is more effective. Indications for SEO PTS include: severe crouch gait knee flexion deformity of 10 to 30 degrees an extensor lag greater than 10 to 20 degrees patella alta on radiographs The combination of a SEO and PTS addresses the static knee flexion contracture and the dynamic extensor lag. SEO is performed by excision of a trapezoid wedge from the distal femur and stable internal fixation with a blade plate. The patellar tendon may be advanced or shortened. Outcomes[29]: Knee extensor lag improved 14 degrees, from 16 degrees preoperatively to 2 degrees postoperatively. Knee flexion at initial contact improved 16 degrees, from 42 degrees preoperatively to 26 degrees postoperatively. Minimum knee flexion in stance improved 29 degrees, from 38 degrees preoperatively to 9 degrees postoperatively. Presenter s Preferred Method SEO and PTS are performed in skeletally mature patients, or near skeletal maturity with less than 2 years growth remaining. When the distal femoral growth plate is open, the osteotomy must be performed more proximally because the insertion of the blade plate must be between one and two cm proximal to the growth plate to avoid injury to the physis. A proximal osteotomy causes a secondary translation deformity. Our technique for patellar tendon shortening was adopted from the Association for Assistance of the Disabled Child (AACD) in São Paulo, Brazil, as shown in figure 3E[30]. 1. The patellar tendon is divided in its mid substance. 2. The distal segment is prepared with a non absorbable suture and passed proximally through two drill holes along the longitudinal axis of the patella. 3. The proximal segment is repaired over the distal segment to reinforce the repair. 4. Postoperatively the patient s lower extremity is immobilized in a long leg cast for six weeks. This is followed by six more weeks in a solid AFO with a 3 point splint or rigid knee splint. Immobilization of the knee in extension for periods of up to three months is inconvenient but has no bearing on long term function. In spastic diplegia, the knee does not become stiff in extension, but it may do so in flexion. The Ferraretto and Selber technique is both safe and effective. It can be safely used in skeletally immature children in whom advancement of the tibial tuberosity may risk disturbing growth in the anterior tibial apophysis and cause a recurvatum deformity. The technique is effective in correcting patella alta extensor lag and improving stance phase knee extension. Finally there is no retained hardware in the knee extensor mechanism to be removed or cause secondary morbidity. 8
9 Guided Growth Guided growth is helpful for children with spastic diplegia who present with severe crouch gait and progressive knee flexion contractures well before skeletal maturity. Guided growth is less invasive than SEO PTS. Indicated for [31]: Fixed knee flexion deformity of more than 10 degrees 12 months or more predicted growth remaining Staples[32] or 8 plates[31] placed anteriorly, spanning the distal femoral growth plate creates differential growth of the distal femoral physis, with the anterior portion growing more slowly than the posterior portion. Over time, this may correct the flexion deformity. Outcome of 8 plates[31]: Knee flexion deformity decreased by 0.9 degrees/month, correcting knee flexion by an average of 12.7 degrees. Presenter s Preferred Method In skeletally immature patients with knee flexion contractures greater than 10 to 20 degrees, we consider combining guided growth with medial hamstring lengthening and semitendinosus transfers. In children with greater than two years of growth remaining, we typically use 8 plates. Once the correction is achieved, we often remove the proximal screw of the 8 plate if the patient has growth remaining after complete correction, so that it may be reapplied if necessary in the future. The 8 plates are applied outside the periosteum and the effects are reversible once removed. One disadvantage of 8 plates is that they are prominent and at times have been noted to cause a local bursitis, although the exact incidence is not well documented. It seems that patients with significant dystonia can be particularly affected. Staples are less prominent, but reversibility is not guaranteed. Therefore, we use staples in children who are within two years of reaching skeletal maturity and in whom bone age is known accurately. Otherwise, we believe there would be a significant and unacceptable risk of recurvatum deformity at the knee. Recurvatum gait in the adolescent can be particularly difficult to correct. MEASURING OUTCOMES Knee function following an intervention can be assessed by: The Diagnostic Matrix the patient s symptoms, physical exam measures, gait analysis, radiology, etc. Functional outcome measurements include the FAQ[33] and the FMS[34]. The Movement Analysis Profile (MAP) and the Gait Profile Score (GPS)[35] SUMMARY: WHAT S THE DOSE? Deciding the surgical dose is a useful concept in the management of knee dysfunction in cerebral palsy. In order of increasing dose we think the interventions for improving knee extension include: 9
10 Injections of botulinum neurotoxin A as a temporizing measure for hamstring spasticity. Medial hamstring lengthening for mild knee dysfunction, usually younger patients with mild jump gait and minimal flexion deformity, less than 5 degrees Medial hamstring lengthening combined with semitendinosus transfer to the adductor tubercle for more severe flexed knee gait and mild to moderate knee flexion deformities, 5 15 degrees. Transfer of the semitendinosus combined with growth plate surgery for severe flexed knee gait, combined with knee flexion deformities of degrees in the patients with at least two years of growth remaining. Supracondylar extension osteotomy combined with patellar tendon shortening for severe flexed knee gait, combined with knee flexion deformities of degrees, in patients with severe quadriceps lag who are either close to or already at skeletal maturity. REFERENCES: 1. Young JL, Rodda J, Selber P, Rutz E, Graham HK. Management of the Knee in Spastic Diplegia: What's the Dose? Orthopedic Clinics of North America Davids JR, Ounpuu S, DeLuca PA, Davis RB. Optimization of walking ability of children with cerebral palsy. J Bone Joint Surg Am. November 1, ;85(11): Sutherland DH, Davids JR. Common gait abnormalities of the knee in cerebral palsy. Clin Orthop Relat Res. Mar 1993(288): Rodda JM, Graham HK, Carson L, Galea MP, Wolfe R. Sagittal gait patterns in spastic diplegia. J Bone Joint Surg Br. Mar 2004;86(2): Damiano DL, Abel MF. Functional outcomes of strength training in spastic cerebral palsy. Arch Phys Med Rehabil. Feb 1998;79(2):
11 6. Scholtes VA, Becher JG, Comuth A, Dekkers H, L VAND, Dallmeijer AJ. Effectiveness of functional progressive resistance exercise strength training on muscle strength and mobility in children with cerebral palsy: a randomized controlled trial. Dev Med Child Neurol. Jan 28;52:e107-e Damiano DL, Arnold AS, Steele KM, Delp SL. Can strength training predictably improve gait kinematics? A pilot study on the effects of hip and knee extensor strengthening on lower-extremity alignment in cerebral palsy. Phys Ther. Feb 2010;90(2): Leonard J, Graham HK. Treatment of motor disorders in cerebral palsy with Botulinum neurotoxin. In: Jankovic E, ed. Botulinum Toxin: Therapeutic Clinical Practice and Science. Philadelphia: Saunders Elsevier, Inc.; 2009: Hutchinson R, Graham HK. Management of spasticity in children. In: Barnes M, Johnson G, eds. Upper Motor Neurone Syndrome and Spasticity. 2 ed. Cambridge: University Press; 2008: Corry IS, Cosgrove AP, Duffy CM, Taylor TC, Graham HK. Botulinum toxin A in hamstring spasticity. Gait Posture. Dec 1999;10(3): Molenaers G, Desloovere K, Fabry G, De Cock P. The effects of quantitative gait assessment and botulinum toxin a on musculoskeletal surgery in children with cerebral palsy. J Bone Joint Surg Am. Jan 2006;88(1):
12 12. Delp SL, Arnold AS, Speers RA, Moore CA. Hamstrings and psoas lengths during normal and crouch gait: implications for muscle-tendon surgery. J Orthop Res. Jan 1996;14(1): Kay RM, Rethlefsen SA, Skaggs D, Leet A. Outcome of medial versus combined medial and lateral hamstring lengthening surgery in cerebral palsy. J Pediatr Orthop. Mar-Apr 2002;22(2): DeLuca PA, Ounpuu S, Davis RB, Walsh JH. Effect of hamstring and psoas lengthening on pelvic tilt in patients with spastic diplegic cerebral palsy. J Pediatr Orthop. Nov-Dec 1998;18(6): Majestro TC, Ruda R, Frost HM. Intramuscular lengthening of the posterior tibialis muscle. Clin Orthop Relat Res. Sep 1971;79: Gage JR. Surgical treatment of knee dysfunction in cerebral palsy. Clin Orthop Relat Res. Apr 1990(253): Gage JR, Perry J, Hicks RR, Koop S, Werntz JR. Rectus femoris transfer to improve knee function of children with cerebral palsy. Dev Med Child Neurol. Apr 1987;29(2): Rethlefsen SA, Kam G, Wren TA, Kay RM. Predictors of outcome of distal rectus femoris transfer surgery in ambulatory children with cerebral palsy. J Pediatr Orthop B. Mar 2009;18(2): Kay RM, Rethlefsen SA, Kelly JP, Wren TA. Predictive value of the Duncan-Ely test in distal rectus femoris transfer. J Pediatr Orthop. Jan- Feb 2004;24(1):
13 20. Sutherland DH, Santi M, Abel MF. Treatment of stiff-knee gait in cerebral palsy: a comparison by gait analysis of distal rectus femoris transfer versus proximal rectus release. J Pediatr Orthop. Jul-Aug 1990;10(4): Perry J. Distal rectus femoris transfer. Dev Med Child Neurol. Apr 1987;29(2): Ounpuu S, Muik E, Davis RB, 3rd, Gage JR, DeLuca PA. Rectus femoris surgery in children with cerebral palsy. Part II: A comparison between the effect of transfer and release of the distal rectus femoris on knee motion. J Pediatr Orthop. May-Jun 1993;13(3): Muthusamy K, Seidl AJ, Friesen RM, Carollo JJ, Pan Z, Chang FM. Rectus femoris transfer in children with cerebral palsy: evaluation of transfer site and preoperative indicators. J Pediatr Orthop. Sep 2008;28(6): Ounpuu S, Muik E, Davis RB, 3rd, Gage JR, DeLuca PA. Rectus femoris surgery in children with cerebral palsy. Part I: The effect of rectus femoris transfer location on knee motion. J Pediatr Orthop. May-Jun 1993;13(3): Cruz AI, Ounpuu S, Deluca PA. Distal rectus femoris intramuscular lengthening for the correction of stiff-knee gait in children with cerebral palsy. J Pediatr Orthop. Jul-Aug 2011;31(5):
14 26. Eggers GW. Transplantation of hamstring tendons to femoral condyles in order to improve hip extension and to decrease knee flexion in cerebral spastic paralysis. J Bone Joint Surg Am. Oct 1952;34(4): Evans EB. The status of surgery of the lower extremities in cerebral palsy. Clin Orthop Relat Res. Jul-Aug 1966;47: Ma FY, Selber P, Nattrass GR, Harvey AR, Wolfe R, Graham HK. Lengthening and transfer of hamstrings for a flexion deformity of the knee in children with bilateral cerebral palsy: technique and preliminary results. J Bone Joint Surg Br. Feb 2006;88(2): Stout JL, Gage JR, Schwartz MH, Novacheck TF. Distal femoral extension osteotomy and patellar tendon advancement to treat persistent crouch gait in cerebral palsy. J Bone Joint Surg Am. Nov 2008;90(11): Ferraretto I, Machado PO, Rolim Filho EL, Selber P. Preliminary results of patelar tendon shortening, as a salvage procedure for crouch gait in cerebral palsy. In: Pediatric Orthopaedic Society of North America Annual Meeting; 2000; Vancouver, British Columbia Canada. 31. Klatt J, Stevens PM. Guided growth for fixed knee flexion deformity. J Pediatr Orthop. Sep 2008;28(6): Kramer A, Stevens PM. Anterior femoral stapling. J Pediatr Orthop. Nov- Dec 2001;21(6):
15 33. Novacheck TF, Stout JL, Tervo R. Reliability and validity of the Gillette Functional Assessment Questionnaire as an outcome measure in children with walking disabilities. J Pediatr Orthop. Jan-Feb 2000;20(1): Harvey A, Graham HK, Morris ME, Baker R, Wolfe R. The Functional Mobility Scale: ability to detect change following single event multilevel surgery. Dev Med Child Neurol. Aug 2007;49(8): Baker R, McGinley JL, Schwartz MH, et al. The gait profile score and movement analysis profile. Gait Posture. Oct 2009;30(3):
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