Background. Spastic muscles of patients with cerebral palsy (CP) are considered structurally as shortened muscles, that produce high force in short muscle lengths. Yet, previous intraoperative studies in which muscles’ forces are measured directly as a function of joint angle showed consistently that spastic knee flexor muscles produce a low percentage of their maximum force in flexed knee positions. They also showed effects of epimuscular myofascial force transmission (EMFT): simultaneous activation of different muscles elevated target muscle's force. However, quantification of spastic muscle's force - muscle-tendon unit length (l. MTU. ) data during gait is lacking. Aim. Combining intraoperative experiments with participants’ musculoskeletal models developed based on their gait analyses, we aimed to test the following hypotheses: activated spastic semitendinosus (ST) muscle (1) operates at short l. MTU. 's during gait, forces are (2) low at short l. MTU. 's and (3) increase by co-activating other muscles. Methods. Ten limbs of seven children with CP (GMFCS-II) were tested. Pre-surgery, gait analyses were conducted. Intraoperatively, isometric spastic ST distal forces were measured in ten hip-knee joint angle combinations, in two conditions: (i) activation of the ST individually and (ii) simultaneously with the gracilis, biceps femoris, and rectus femoris muscles endorsing EMFT. In OpenSim, gait_2392 model was used for each limb to (a) calculate l. MTU. per each hip and knee angle combination and the gait relevant l. MTU. range, and (b) analyze gait relevant spastic muscle force - l. MTU. data. Two-way ANOVA was used to compare the patients’ l. MTU. to those of the seven age-matched typically developing (TD) children. l. MTU. values were normalized for the participants’ thigh length. (a) was used to test hypothesis (1) and (b) to test hypotheses (2) and (3): in condition (i), the percent of peak force exerted at the shortest l. MTU. calculated per limb was used as a metric for (2). In condition (ii), mean percent change in muscle force calculated within gait-relevant l. MTU. range was used as a metric for (3). Results. Modeling showed that l. MTU. of spastic ST during gait is shorter on average by 14.1% compared to TD. The ST active force at the shortest gait-relevant l. MTU. was 68.6 (20.6)% (39.9–99.2%) of the peak force. Simultaneous activation of other muscles caused substantial increases in force (minimally by 11.1%, up to several folds, with an exception for one limb). Therefore, only the first and third hypotheses were confirmed. Conclusion. The modeling showed in concert with the clinical considerations that spastic ST may be a shortened muscle that produces high force in short muscle lengths. However, this contrasts intraoperative data, which shows only low forces in flexed knee positions. Note that, the model does not distinguish the muscle-belly and tendon lengths. Therefore, it cannot isolate shorter muscle length and how this compares to the data of TD children remains unknown. Yet, the effects of co-activation of other muscles shown intraoperatively to cause an increase of the spastic ST's force are observed also in muscle force - l. MTU. data characterizing gait. Therefore, if indeed spastic ST produces high forces in short muscle-belly lengths alone, elevated forces due to co-activation of other muscles may be considered as a contributor to the patients’ pathological gait. Otherwise, such EMFT effect may be the main determinant of the pathological condition

We report a femoral shaft fracture that reduced spastic muscle hypertonus of the affected lower limb of a child with cerebral palsy. The child was a five years old boy. He was borne with spastic quadriplegia (total body involvement). He could not sit, stand and walk by himself. The femoral shaft fracture occurred during physiotherapy. The injury itself was iatrogenic although the bones were accompanied by roentgenological bone atrophy. Such bone atrophy comes from disuse or low physical activity. The fracture was treated by a hip spica cast. The femoral bone was shortened at the time of immobilization. After removing the cast, the spastic muscle hypertonus was apparently reduced. This instructive case suggests osteotomy as a new effective treatment for spastic hypertonus. Osteotomies would make few scars in the muscles and tendons comparing to lengthening of multiple tendons and muscles. In this case, osteotomies are believed to be a non-invasive treatment rather than other available operative procedures

Introduction and Objective. Clinically, it is considered that spastic muscles of patients with cerebral palsy (CP) are shortened, and produce higher force in shorter muscle lengths. Yet, direct quantification of spastic muscles’ forces is rare. Remarkably, previous intraoperative tests in which muscle forces are measured directly as a function of joint angle showed for spastic gracilis (GRA) that its passive forces are low, and only a small percentage of its maximum active force is measured in flexed knee positions. However, the relationship of force characteristics of spastic GRA with its muscle-tendon unit length (l. MTU. ) is unknown. Combining intraoperative experiments with participants’ musculoskeletal models developed based on their gait analyses, we aimed to test if spastic GRA muscle (1) operates at short l. MTU. compared to that of typically developing (TD) children, and exerts higher (2) passive and (3) active forces at shorter lengths, within gait-relevant l. MTU. range. Materials and Methods. Ten limbs of seven children with CP (GMFCS-II) were tested. Pre-surgery, gait analyses were conducted. Intraoperatively, isometric spastic GRA distal forces were measured in ten hip-knee joint angle combinations, in two conditions: (i) passive state and (ii) maximal activation of the GRA exclusively. In OpenSim, gait_2392 model was used for each limb to calculate l. MTU. 's per each hip and knee angle combination and the gait-relevant l. MTU. range, and to analyze gait relevant spastic muscle force - l. MTU. data. l. MTU. values were normalized for the participants’ thigh lengths. Two-way ANOVA was used to compare the patients’ l. MTU. to those of the seven age-matched TD children to test the first hypothesis. In order to test the second and the third hypotheses, Spearman's rank correlation coefficient (ρ) was calculated to seek a correlation between the muscle's operational length (represented by mean l. MTU. within gait cycle) and muscular force characteristics (the percent force at shortest l. MTU. of peak force, either in passive or in active conditions) within gait-relevant l. MTU. range. Results. ANOVA showed that l. MTU. 's of spastic GRA are shorter (on average by 15.4%) compared to those of TD. At the shortest gait-relevant l. MTU. , the GRA passive force was 84.6 (13.7)% of the peak passive force; and the active force was 55.8 (33.9)% of the peak active force. Passive state forces show an increase at longer lengths, whereas active state force characteristics vary in a patient-specific way. Spearman's rank correlation indicated weak correlations between muscle's operational length and muscular force characteristics (ρ= −0.30 P= 0.40, and ρ= −0.27 P= 0.45, for passive and active states, respectively). Therefore, only the first hypothesis was confirmed. Conclusions. Novel muscle force - l. MTU. data for spastic GRA were obtained using intraoperative data and modelling combined. The modelling showed in concert with the clinical considerations that spastic GRA may be a shortened muscle. However, because the model does not distinguish the muscle-belly and tendon lengths, it cannot isolate shorter muscle belly length and how this compares to the data of TD children remains unknown. Moreover, the absence of a strong correlation between shorter operational muscle length and higher force production either in passive or in active conditions highlights the influence of other factors (e.g., muscle structural proteins, and muscle mechanical characteristics including intermuscular interactions etc.) on the pathology rather than ascribing it solely to the length of a spastic muscle itself

Spasticity is a complex syndrome requiring extensive and complete treatment. Injections of botulinum toxin type A decrease muscle tone in spastic muscles of the hand and improve the use of the upper limb. However, rehabilitation and different non-invasive treatments should also be considered. Shock waves are defined as a sequence of single sonic pulses characterised by high peak pressure (100 MPa), fast pressure rise (< 10 ns) and short duration (10 μs). Twenty patients, with upper limb spasticity post stroke were enrolled in the study. The patients (12 men and eight women) had a mean age of 63 years (36–76 years). An electromagnetic coil lithotriptor (Modulith SLK® by Storz Medical AG) provided with in-line ultrasound, radiographic, and computerised aiming (Lithotrack® system) was used. Flexor muscles of the forearm were treated with 1500 shots, and 3200 shots were used for interosseous muscles of the hand (800 for each muscle). The energy applied was 0.030 mj/mm. The protocol consisted of one placebo treatment session in which no shock waves were applied, followed 1 week later by one active shock wave treatment session. The Ashworth Scale was used to study the muscle tone activity in patients. No changes in the Ashworth score were noted in hand and wrist flexion after placebo stimulation. After real treatment the hand muscles and finger flexion in particular showed a marked reduction in spasticity with a change in the Ashworth scale from 3 to 0. At 1, 4, and 12 weeks, a slight increase in muscle tone was observed for all subjects. Needle EMG was performed at 4 weeks. No denervation was observed. The main finding of this preliminary study is that a single active treatment of shock wave therapy in spastic muscles in a patient affected by stroke resulted in a significant reduction in muscle tone. In contrast, no effect was noted after placebo stimulation. Nitric oxide synthesis has been suggested to be one of the most important mechanisms to explain the effectiveness of shock waves in the treatment of different soft tissue diseases. Shock wave therapy appeared to be safe, non invasive and without complications. Our findings suggest that shock wave therapy may be useful in decreasing flexor tone and functional disability in patients with spasticity of the hand, with a long-lasting effect. This therapy could open a new field of research in the treatment of spasticity. Further studies with a larger group of patients are, therefore, necessary

To compare the effects of botulinum toxin injection with and without electromyographic (EMG) assistance for the treatment of spastic muscles. In a prospective comparative study, botulinum toxin was injected intramuscularly into 17 patients with spasticity due to CNS damage (CP, SCI, head injury, stroke). All patients were evaluated using the modified Ashworth scale and the score was 2–4. In 9/17 patients, group A (53%), the injection was given with EMG assistance, while in 8/17 patients, group B (47%), without, always from the same injectionist. The follow-up period ranged from 4 to 24 months. Average spasticity decreased in all injected muscles and new scores were 1–2 grades less according the modified Ashworth scale. No complications or side effects were noted. The average reduction of spasticity reached 1.66 (SD 0.5) in group A and 1.25 (SD 0.46) in group B. The average reduction of spasticity was statistically more pronounced in group A (p< 0.001). The effectiveness of botulinum toxin injection for the treatment of muscle spasticity in patients with CNS damage increases when used with EMG assistance and this is attributed to the appropriateness of points for injection

Aim: To compare the effects of botulinum toxin injection with and without electromyographic (EMG) assistance for the treatment of spastic muscles. Methods: In a prospective comparative study, botulinum toxin was injected intramuscularly into 17 patients with spasticity due to CNS damage (CP, SCI, head injury, stroke). All patients were evaluated using the modified Ashworth scale and the score was 2–4. In 9/17 patients, group A (53%), the injection was given with EMG assistance, while in 8/17 patients, group B (47%), without, always from the same injectionist. The follow-up period ranged from 4 to 24 months. Results: Average spasticity decreased in all injected muscles and new scores were 1–2 grades less according the modified Ashworth scale. No complications or side effects were noted. The average reduction of spasticity reached 1.66 (SD 0.5) in group A and 1.25 (SD 0.46) in group B. The average reduction of spasticity was statistically more pronounced in group A (p< 0.001). Conclusions: The effectiveness of botulinum toxin injection for the treatment of muscle spasticity in patients with CNS damage increases when used with EMG assistance and this is attributed to the appropriateness of points for injection

Aim: There were no reports of epiphyseal separation in cerebral palsy/spastic conditions, though cases of displaced metaphyseal & diaphyseal fractures have been reported. Materials and Methods: There were 9 cases of epiphyseal separation involving the distal femur and proximal humerus in 4 severely handicapped children with spastic cerebral palsy. In these 9 cases there was significant epiphyseal slip with periosteal stripping with extensive subperiosteal ossification obvious on the X-rays. The X-rays also showed the following radiological signs: Frankel’s line and a scurvy line. Clinically the area was swollen and painful. Results: The X-ray appearances confirmed the cause to be that of scurvy. Treatment was with Vitamin C, Vitamin D, nutritional support and splintage which resulted in rapid healing with excellent re-modelling. Lack of Vitamin C results in suppression of osteoblasts and interferes with collagen synthesis. Conclusion: Scurvy should be considered as a potential cause of an epiphyseal slip in a child suffering from severe cerebral palsy. Routine Vitamin C dietary supplementation in this group of potentially mal-nourished, non-ambulant children should be considered. The cause of the slip is thought to be lack of Vitamin C in combination with weakness of the bone, spastic muscle acting on long, fragile bones and in some cases, anti-convulsant treatment

Introduction: Traditionally, the degree of correction for derotational femoral osteotomies in cerebral palsy has been based on clinical or radiographic measures. Recently, three dimensional gait analysis has been used to plan and evaluate orthopaedic surgery. Our aim was to assess the outcome of derotation osteotomies, where the degree of rotation at surgery was guided by transverse plane kinematics (aiming at reducing peak hip rotations to normal limits). Method: Pre and post-operative gait analyses were reviewed in a group of these patients (16 legs) and compared with a similar group of 8 patients (16 legs) who had soft tissue procedures only. Results: Improvement following derotation osteotomy occurred in all but one case; 11/16 osteotomies resulted in peak internal rotation within one standard deviation (SD) of peak normal internal rotation (normal range −6° to +11°), the other 4 were within 1.4 SDs. Discussion: Objective improvement in hip rotation during gait was measured in 15/16 subjects undergoing dero-tation osteotomy based on gait analysis. There was no rotational change overall in patients who had soft tissue procedures only. Average dynamic correction of internal rotation during gait was slightly less than intra-operative correction, possibly due to tensioning of spastic muscles

Myoneural blockade is a well-established means of reducing tone in spastic muscles, thereby delaying or avoiding the need for operative intervention. The recent interest in botulinum A toxin has tended to obscure the fact that other agents such as alcohol have been used for many years to achieve a similar effect. Eighty-two children between the ages of 2 and 16 years with cerebral palsy underwent myoneural blocks using 45% ethanol for dynamic contracture of the hamstrings and/or gastrocnemius. The injections were performed under a light general anaesthetic, using a nerve stimulator to localise the myoneural junction. A total of 153 muscle groups were injected. Hamstring tightness improved as a result of ethanol injection, the popliteal angle reducing from a mean of 73° (range 40° – 90°) to 43° (range 10° – 70°). Gastrocnemius tightness also improved, the ankle dorsiflexion with knee extended improving from a mean of −7° to +3°. The maximal effect was achieved in a mean of 12 weeks and was maintained for a further 12 weeks before starting to deteriorate. The time from injection to the next intervention ranged from 13 weeks to over 2 years. There were no complications or adverse effects. The effect of any one therapy in cerebral palsy is difficult to establish, given that there are often several different modalities of treatment operating concurrently. However, the results from this series indicate that myoneural blockade with ethanol is a useful and safe adjunct to other therapies in the child with lower limb spasticity

Spastic muscles show permanent contraction but also paradoxical muscular weakness. Compartmental muscular pressure in normal subjects oscillates between 0 and 5 mmHg. To study compartmental pressure in the posterior superficial compartment of the leg in children with spastic paralysis, to identify its variations after a percutaneous tenotomy of the Achilles tendon, and to find any possible connection with arterial pressure or weight. Twelve patients who had undergone a percutaneous tenotomy of the Achilles tendon were studied. Six of them were tetraplegic and three hemiplegic, with bilateral and unilateral tenotomies respectively. The following variables were taken into consideration: age, weight, systolic and diastolic arterial pressure and pressure of the superficial compartment of the leg, both pre- and post- tenotomy. The measurement of the compartmental pressure was taken using an automatic calibration monitor with an error of measure of ± 1 mmHg. Statistics: descriptive, non-parametric tests (Wilcoxon, Kruskall- Willis). The average age was 9.3 years old, 11 in men and 7.5 in women. 89.5% of the total population was male and 10.5 % female. The average weight was 27.2 Kilograms, 28.1 Kg. in men and 20.5 Kg. in women. Systolic pressure was 94.1 mmHg and diastolic pressure 41.3 mmHg. Pre-tenotomy compartmental pressure was 12.1 mmHg and 7.9 mmHg post-tenotomy, decreasing 34.5 % (p= 0.08, N.S.). Systolic pressure had no relation to pre-tenotomy (r = −0.16) o post-tenotomy (r = −0.13) compartmental pressure. Diastolic pressure had no relation either (p =0.2 and r=−0.36), respectively. The pressure of the superficial compartment of the leg is higher than normal in spastic patients, decreasing, although not significantly, after a percutaneous tenotomy of the Achilles tendon is performed

Children with cerebral palsy (CP) have an increased risk of progressive hip displacement. While the cause of hip displacement remains unclear, spasticity and muscle imbalance around the hip are felt to be a major factor. There is strong evidence demonstrating that a selective dorsal rhizotomy (SDR) reduces spasticity. However, the impact of this decreased spasticity on hip displacement is unknown. Past studies, which are small and lack long-term follow-up, do not provide a clear indication of the effect of SDR on hip displacement. The purpose of this study was to determine the influence of SDR on hip displacement in children with CP a minimum of five years post-SDR. A retrospective chart review was completed. Participants were selected from a consecutive series of children who had an SDR before January 1, 2013 at one tertiary care facility to ensure a minimum five year follow-up. Pre-operative and minimum five year post-SDR AP pelvis radiographs were required for inclusion. Hip displacement was evaluated using change in MP between radiographs completed pre-SDR and minimum five years post-SDR, or until orthopaedic hip surgery. In total, 77 participants (45 males, 32 females) at GMFCS levels of I (1), II (11), III (22), IV (35) and V (8) were included in the review. Mean age at time of SDR was 5 years (2.8– 11.6yrs). Pre-SDR mean MP of the 154 hips was 29% (0–100%). Post-SDR, 67 (43.5%) hips in 35 children had soft tissue, reconstructive, or salvage hip procedures at an average of 4.9 years (0.5–13.8yrs) post-SDR and an average MP of 46% (11–100%). In addition, seven hips (5%) had a MP ≥ 40% (40–100%) at most recent radiographic review that averaged 11 years (5.6–18.6yrs). Overall, the total number of subjects with hip displacement measuring MP >40% or who had a surgical hip intervention, by GMFCS level, was: 0 (0%) at level I, 0 (0%) at level II, 20 (45%) at level III, 22 (59%) at level IV, and 5 (81%) at level V. The incidence of hip displacement in children with CP post-SDR did not substantially differ from the overall incidence reported in the literature when evaluated by GMFCS level. This study is the largest long-term follow-up study investigating the effect of hip displacement post-SDR. Results suggest that SDR does not impact hip displacement in CP, however, further prospective study will be required to strengthen the evidence in this regard

Purpose of study: To describe the histological effects of botulinum toxin on gastrocnemius muscle affected by cerebral palsy. Method: Samples of gastrocnemius were obtained at the time of surgery. Ethical committee approval had been obtained for the study. Details of timing and doses of botulinum toxin previously administered to the muscle were recorded. A variety of immunohistochemical tests were employed to identify any changes in the muscle. Alterations in the distribution of myosin isoforms were identified with antibodies for fast, slow and neonatal myosin. The presence of persistent denervation was inferred from fibres deficient in neuronal nitric oxide synthase (nNOS). Mitochondrial abnormalities were assessed with an NADH stain and the presence of chronic atrophic fibres (nuclear clumps) noted. Results: Our first case had received 3 botulinum injections over a period of 5 years, the last one 3 years prior to biopsy. Histology showed pronounced abnormalities with a wide variation in fibre size, areas of myofibrillar disruption and 50% of fibres co-expressing fast and slow myosin. Other samples showed less change but showed more frequent nuclear clumps than controls, indicating chronic atrophy and more hybrid fibres than controls, but always less than 10%. Treated muscles also showed a small, variable number of atrophic fibres without nNOS. Treated samples showed no apparent fibre type grouping, a feature associated with collateral sprouting of peripheral nerves following denervation. Conclusions: Moderate doses of botulinum toxin appear to produce an alteration in muscle histology apparent several years afterwards. No correlation could be found between the timing of the previous injection or the dose of botulinum toxin injected and the severity of the changes. Botulinum toxin remains a valuable aid in the management of spastic muscle. However consideration should be given to other methods of treatment if an effective non surgical alternative exists

Pediatric hand surgery in general requires special considerations and this is even more true when planning surgery in children with CP. It is important for the surgeon to realize that the functional problems these children exhibit have their cause in a brain damage which is not amenable to hand surgical treatment. Therefore it is crucial to carefully analyze each child’s impairment including the voluntary motor control and the child’s specific needs before endeavoring into surgery. Associated impairments, such as mental retardation, nutritional problems, epilepsy, dystonia or severe sensory deficits may influence decision-making, but the crucial factor is often the child’s own wish for an improved function. A child that completely neglects his or her extremity is usually not helped by surgery, at least not in an attempt to get a better hand function. Hand surgery in CP mainly comes down to three techniques: 1. Reducing strength in spastic muscles by release operation, either at the origin of the muscle, at the insertion or as a fractional lengthening at the musculo-tendinous junction, 2. Increasing strength in weak antagonists by tendon transfer or 3. Stabilizing joints through an arthrodesis or a tenodesis. Most often a combination of these techniques is used. Almost all hand surgeons in this field have acquired their personal choice of procedures and scientific support for the benefits of the different techniques is scarce. My personal arsenal will be described in the panel but includes biceps-brachialis muscle release at the elbow, pronator teres rerouting, flexor carpi ulnaris to extensor carpi radialis brevis (Green’s) transfer and adductor pollicis muscle release in the palm combined with extensor pollicis longus rerouting for the thumb-in-palm deformity. In my mind, it is not most important which tendon transfer that is selected, but the choice of which child to operate and at what age. It is also important to tension the tendon transfers exactly right and to plan the postoperative treatment properly. The surgeon should, of course, also make sure that the child’s and the parent’s expectations on the results are realistic. Botulinum toxin A has now been used for several years in the treatment of children with cerebral palsy and the drug has been shown to be safe and effective in reducing muscle tone both in the lower and the upper extremities. It has been more difficult to show effects on hand function especially in the long-term perspective. I will present our treatment protocol for botulinum toxin injections. In 1994, a population-based health care program for children with CP was started in Lund in southern Sweden. All children in our region with a diagnosis of CP, born after Jan 1st 1990 are invited to follow the program which includes regular measurements of range of motion in extremity joints, standardized radiographic examinations of the hip joints and registration of surgery and spasticity treatments. The program, called CPUP has been very successful in the prevention of spastic hip dislocation, wind swept position and contractures. Some early results from the upper extremity part of CPUP will be presented. We believe that the program in time will give us valuable information on the natural course of joint motion and impairment of hand function in children with CP

Aims

To systematically review the efficacy of split tendon transfer surgery on gait-related outcomes for children and adolescents with cerebral palsy (CP) and spastic equinovarus foot deformity.

Aim: To evaluate the accuracy of ultrasound to locate the gastrocnemius musculotendinous junction (GMTJ) prior to surgery. There is no clear clinical method to precisely localise this junction, either in the paediatric or adult populations. Method: Twenty calves in 12 paediatric patients with a diagnosis of spastic gastrocnemius muscle (GM) contracture underwent ultrasound examination prior to slide lengthening (Strayer). Surgeons did the ultrasound examination after only a short introduction to the method, using a portable ultrasound machine (Sonosite 180 PLUS) with a linear (5–10 MHz frequency range) transducer. Only the GMTJ of medial head was located as it usually has a lower attachment and is thicker. The soleus muscle has short multipennate fibres running obliquely between aponeuroses overlying its anterior and posterior surfaces. GM has long parallel fibres and merges distally with the posterior aponeurosis of the soleus muscle. The GMTJ has a unique conical appearance on ultrasound. Pre operative skin markings were compared with the location of GMTJ during surgery. Results: All ultrasound-guided locations of GMTJ were found to be accurate within 5mm at time of surgery. Conclusions: This study indicates that ultrasound of the calf muscles by a surgeon prior to surgery is an accurate and reliable way of centering the incision over the GMTJ. The distinct morphological structure of the soleus muscle and overlying GM heads means that even surgeons with little ultrasound experience can perform the examination

Patients with spastic diplegia who walk with a crouched posture often suffer from anterior knee pain, thought to be due to cephalad displacement of the patella. Ambulation with flexed knees elongates the patellar tendon, which leads to development of patella alta. Our study of 57 patients with spastic diplegia aimed to determine the severity of patella alta and to investigate its correlation with spasticity and muscle imbalance at the level of the knee. The ages of the 31 male and 26 female patients ranged from 3 months to 16 years. They were divided into two groups, one with spasticity of the hamstrings and the other with combined spasticity of the quadriceps and hamstrings. Clinical evaluation documented anterior knee pain, walking capacity, fixed deformities, hamstrings and rectus femoris shortening, and patellar mobility. Lateral radiographs were taken to measure the length of the patella and the patellar tendon. We used the method described by Insall and Salvati to calculate the patellar ratio. The clinical findings were examined for correlations with the severity of patella alta. We found that the group of patients with quadriceps and hamstring spasticity had a higher rate of patellar displacement but less frequent anterior knee pain than the group of patients with hamstring spasticity alone

Aims

Hip displacement, common in patients with cerebral palsy (CP), causes pain and hinders adequate care. Hip reconstructive surgery (HRS) is performed to treat hip displacement; however, only a few studies have quantitatively assessed femoral head sphericity after HRS. The aim of this study was to quantitatively assess improvement in hip sphericity after HRS in patients with CP.

The August 2012 Research Roundup³⁶⁰ looks at: PRP and chondrogenic differentiation; basic fibroblast growth factor; whether glucosamine works; randomised trials; ossification of the ligamentum flavum; treadmill running; inhibiting BMP antagonists; and whether NSAIDs delay union after all.