Aims . This is the first prospective study to report the pre- and post-operative patient reported outcomes and satisfaction scores following excision of interdigital Morton’s neuroma. Patients and Methods. Between May 2006 and April 2013, we prospectively studied 99 consecutive patients (111 feet) who were to undergo excision of a Morton’s neuroma. There were 78 women and 21 men with a mean age at the time of surgery of 56 years (22 to 78). Patients completed the Manchester-Oxford Foot Questionnaire (MOXFQ), Short Form-12 (SF-12) and a supplementary patient satisfaction survey three months pre-operatively and six months post-operatively. Results. Statistically significant differences were found between the mean pre- and post-operative MOXFQ and the physical component of the SF-12 scores (p = 0.00081 and p = 0.00092 respectively). Most patients reported their overall satisfaction as excellent (n = 49, 49.5%) or good (n = 29, 29.3%), but ten patients were dissatisfied, reporting poor (n = 8, 8.1%) or very poor (n = 2, 2.0%) results. Only 63 patients (63%) were pain-free at follow-up: in eight patients (8.1%), the MOXFQ score worsened. There was no statistically significant difference in outcome between surgery on single or multiple sites. However, the MOXFQ scores were significantly worse after revision surgery (p = 0.004). Conclusions. The patient-reported outcomes after resection of a symptomatic Morton’s neuroma are acceptable but may not be as good as earlier studies suggest. Surgery at several sites can be undertaken safely but caution should be exercised when considering revision surgery. Cite this article: Bone Joint J 2016;98-B:1376–81

The responsiveness of the Manchester–Oxford Foot Questionnaire (MOXFQ) was compared with foot/ankle-specific and generic outcome measures used to assess all surgery of the foot and ankle. We recruited 671 consecutive adult patients awaiting foot or ankle surgery, of whom 427 (63.6%) were female, with a mean age of 52.8 years (18 to 89). They independently completed the MOXFQ, Short-Form 36 (SF-36) and EuroQol (EQ-5D) questionnaires pre-operatively and at a mean of nine months (3.8 to 14.4) post-operatively. Foot/ankle surgeons assessed American Orthopaedic Foot and Ankle Society (AOFAS) scores corresponding to four foot/ankle regions. A transition item measured perceived changes in foot/ankle problems post-surgery. Of 628 eligible patients proceeding to surgery, 491 (78%) completed questionnaires and 262 (42%) received clinical assessments both pre- and post-operatively. The regions receiving surgery were: multiple/whole foot in eight (1.3%), ankle/hindfoot in 292 (46.5%), mid-foot in 21 (3.3%), hallux in 196 (31.2%), and lesser toes in 111 (17.7%). Foot/ankle-specific MOXFQ, AOFAS and EQ-5D domains produced larger effect sizes (> 0.8) than any SF-36 domains, suggesting superior responsiveness. In analyses that anchored change in scores and effect sizes to patients’ responses to a transition item about their foot/ankle problems, the MOXFQ performed well. The SF-36 and EQ-5D performed poorly. Similar analyses, conducted within foot-region based sub-groups of patients, found that the responsiveness of the MOXFQ was good compared with the AOFAS.

This evidence supports the MOXFQ’s suitability for assessing all foot and ankle surgery.

Aims. Although absorbable sutures for the repair of acute Achilles tendon rupture (ATR) have been attracting attention, the rationale for their use remains insufficient. This study prospectively compared the outcomes of absorbable and nonabsorbable sutures for the repair of acute ATR. Methods. A total of 40 patients were randomly assigned to either braided absorbable polyglactin suture or braided nonabsorbable polyethylene terephthalate suture groups. ATR was then repaired using the Krackow suture method. At three and six months after surgery, the isokinetic muscle strength of ankle plantar flexion was measured using a computer-based Cybex dynamometer. At six and 12 months after surgery, patient-reported outcomes were measured using the Achilles tendon Total Rupture Score (ATRS), visual analogue scale for pain (VAS pain), and EuroQoL five-dimension health questionnaire (EQ-5D). Results. Overall, 37 patients completed 12 months of follow-up. No difference was observed between the two groups in terms of isokinetic plantar flexion strength, ATRS, VAS pain, or EQ-5D. No re-rupture was observed in either group. Conclusion. The use of absorbable sutures for the repair of acute ATR was not inferior to that of nonabsorbable sutures. This finding suggests that absorbable sutures can be considered for the repair of acute ATRs. Cite this article: Bone Joint J 2022;104-B(8):938–945

Aims. Arthroscopic microfracture is a conventional form of treatment for patients with osteochondritis of the talus, involving an area of < 1.5 cm. 2. However, some patients have persistent pain and limitation of movement in the early postoperative period. No studies have investigated the combined treatment of microfracture and shortwave treatment in these patients. The aim of this prospective single-centre, randomized, double-blind, placebo-controlled trial was to compare the outcome in patients treated with arthroscopic microfracture combined with radial extracorporeal shockwave therapy (rESWT) and arthroscopic microfracture alone, in patients with ostechondritis of the talus. Methods. Patients were randomly enrolled into two groups. At three weeks postoperatively, the rESWT group was given shockwave treatment, once every other day, for five treatments. In the control group the head of the device which delivered the treatment had no energy output. The two groups were evaluated before surgery and at six weeks and three, six and 12 months postoperatively. The primary outcome measure was the American Orthopaedic Foot and Ankle Society (AOFAS) Ankle-Hindfoot Scale. Secondary outcome measures included a visual analogue scale (VAS) score for pain and the area of bone marrow oedema of the talus as identified on sagittal fat suppression sequence MRI scans. Results. A total of 40 patients were enrolled and randomly divided into the two groups, with 20 in each. There was no statistically significant difference in the baseline characteristics of the groups. No complications, such as wound infection or neurovascular injury, were found during follow-up of 12 months. The mean AOFAS scores in the rESWT group were significantly higher than those in the control group at three, six, and 12 months postoperatively (p < 0.05). The mean VAS pain scores in the rESWT group were also significantly lower than those in the control group at these times (p < 0.05). The mean area of bone marrow oedema in the rESWT group was significantly smaller at six and 12 months than in the control group at these times (p < 0.05). Conclusion. Local shockwave therapy was safe and effective in patients with osteochondiritis of the talus who were treated with a combination of arthroscopic surgery and rESWT. Preliminary results showed that, compared with arthroscopic microfracture alone, those treated with arthroscopic microfracture combined with rESWT had better relief of pain at three months postoperatively and improved weightbearing and motor function of the ankle. Cite this article: Bone Joint J 2023;105-B(10):1108–1114

Background. Optimal management of displaced intra-articular calcaneal fractures remains controversial. The aim of this prospective cohort study was to compare the clinical and radiological outcomes of minimally invasive surgery (MIS) versus non-operative treatment in displaced intra-articular calcaneal fracture up to 2-years. Methods. All displaced intra-articular calcaneal fractures between August 2014 and January 2019 that presented to a level 1 trauma centre were considered for inclusion. The decision to treat was made by a multidisciplinary meeting. Operative treatment protocol involved sinus tarsi approach or percutaneous reduction & internal fixation. Non-operative protocol involved symptomatic management with no attempt at closed reduction. All fractures were classified, and the MOXFQ/EQ-5D-5L scores were used to assess foot and ankle and general health-related quality of life outcomes respectively. Results. 101 patients were recruited at a level 1 major trauma centre, between August 2014 and January 2019. Our propensity score matched 44 patients in the surgical cohort to 44 patients in the non-surgical cohort. At 24 months, there was no significant difference in the MOXFQ Index score (p<0.05) however the patients in the surgical cohort had a significantly higher EQ-5D-5L Index score (p<0.05). There was also a higher return to work (91% vs 72%, p<0.05) and physical activity rate (46 vs. 35%, p<0.05) in the surgical cohort despite a higher proportion of more complex fractures in the surgical cohort. The wound complication rate following surgery was 16%. 14% of patients in the non-operative cohort subsequently underwent arthrodesis compared to none of the patients in the surgical cohort. Conclusion. In this study, we found operative treatments were associated with low rates of surgical complication at 2-years and long term pain improvement, facilitating earlier and better functional outcomes for complex injury patterns compared to nonoperative treatment

Background

Charcot neuroarthropathy is a destructive disease characterized by progressive bony fragmentation as a result of the isolated or accumulative trauma in patients with decreased sensation that manifests as dislocation, periarticular fractures and instability. Although amputation can be a reasonable cost economic solution, many patients are willing to avoid that if possible. We explored here one of the salvage procedures.

Purpose

To explore the relationship in terms of time scale between pre-operative expectations and postoperative outcomes and satisfaction after Hallux valgus surgery.

Objective

To evaluate early mobilization with the ‘STRONG regime’ is safe after lateral ankle ligament repair with suture tape augmentation.

Current knowledge regarding outcomes following surgical treatment of Morton's neuroma remains incomplete. This is the first prospective study to report the pre- and post-operative patient reported outcomes and satisfaction scores following excision of interdigital Morton's neuroma. Over a seven year period, 99 consecutive patients (112 feet) undergoing surgical excision of Morton's neuroma were prospectively studied. 78 patients were female with a mean age at operation of 56 years. Patient recorded outcomes and satisfaction were measured using the Manchester-Oxford Foot Questionnaire (MOXFQ), Short Form-12 (SF12) and a supplementary patient satisfaction survey three months pre and six months post-operatively. Statistically significant differences were found between the mean pre- and post-operative MOXFQ and physical component of the SF-12 (p< 0.05). No difference in outcome was identified in patients in whom multiple neuromas were operated compared to single site surgery. However, revision surgery proved to statistically worsen MOXFQ outcomes post-operatively p< 0.004. Overall satisfaction was reported as excellent (49%) or good (29%) by the majority of patients but 10% were dissatisfied with poor (8%) or very poor (2%) results expressed. Only 64% were pain free at the time of follow-up and 8% of patients MOXFQ scores worsened. These findings illustrate that overall, patient reported outcomes following resection of symptomatic Morton's neuroma are acceptable but may not be as favourable as earlier studies suggest. Caution should be taken when considering revision surgery which has shown to be a poor prognostic indicator. Contrary to current knowledge, multiple site surgery can be safely undertaken

Introduction:. The role of total ankle replacements remains unproven within orthopaedic literature. We present a prospective series of patients who underwent a SALTO TAR (Tornier) between October 2006 and January 2014. Methods:. A cohort of 53 TAR (50 patients) were prospectively followed up and assessed clinically, radiologically and asked to complete FAOS, VAS and Modified AOFAS scores. Four patients had bilateral procedures. The mean age was 71 years old (range 42–92). The mean follow up was 55 months (range 6–92). Nineteen TARs (19 patients) have a follow up of more than 60 months. Results:. Our survival rate is 98% as one patient proceeded to have an ankle fusion at 12 months due to loosening. Three patients had ankle arthroscopies at 1 year post TAR; one for removal of a fibula cyst, one for synovitis in the lateral gutter and another for fibula impingement. One patient had an early postoperative infection. Mean overall FAOS scores were 73.4 for the entire cohort and 74.2 for the cohort with over 5 years follow-up. Mean modified AOFAS scores for the entire cohort and the cohort with over 5 years follow up was 71.5 and 78.9 respectively. Mean VAS scores for the entire cohort and the cohort with over 5 years follow-up was 18.8 and 25.8 respectively. Discussion:. Ankle joint arthrodesis has been shown to be a reliable in relieving pain and result in good patient satisfaction. However, total ankle replacement provides an alternative surgical option for the management of ankle arthritis. The improving survivorship of ankle replacements is making this an increasingly popular option. Our follow-up of almost five years as an entire cohort, but also those with over five years, show that these latest generations of TAR have excellent mid term survivorship, accompanied by high levels of patient satisfaction and function

Background. Ankle arthrodesis results in significantly improved pain and function for patients with end-stage ankle arthritis. Arthroscopic ankle arthrodesis has gained increasing popularity with reports of shorter hospital stays, time to union and equivalent union rates to open arthrodesis. However, there remains a lack of good quality prospective data. Methods. We report a prospective comparative clinical study comparing open and arthroscopic ankle arthrodesis at two institutions with two-year follow-up. The primary outcome was the Ankle Osteoarthritis Scale and secondary outcomes included the SF-36, hospital stay and radiographic alignment. A power calculation was performed. There were 30 patients in each group. Results. Both groups showed a significant improvement in AOS and physical component score (PCS) of the SF-36 at one and two years. There was a significantly greater improvement in AOS scores at one year and two years and shorter hospital stay in the arthroscopic group. There was no significant difference in complications, surgical time or radiographic alignment. Conclusions. Open and Arthroscopic Ankle arthrodesis demonstrate a significant improvement in pain and function as measured by the AOS. Arthroscopic arthrodesis showed improved outcomes at one and two years and a shorter hospital stay

The percutanous repair of the Achilles tendon is a cost efficient method of restoring early limb function and may offer reduced risk of re-rupture and wound infection. This technique has been described in the elderly population and elite athletes; we present an evaluation of this technique in a District General Hospital setting. We have prospectively audited the outcome of 56 patients who have elected to have percutaneous repair for Achilles tendon rupture from 2009–2011. The majority were males (44) with mean age of 46 years (range 27–80). Twenty nine patients ruptured the right tendon and 27 the left. 82% (46) of injuries were sustained whilst exercising: e.g. football (22), badminton (7), running (5). All but 2 patients were managed on a Day Case basis and 4 requested general anaesthesia. Patients were immediately weight bearing in a brace following surgery and commenced physiotherapy at 2 weeks. Functional outcome was measured using a modified Achilles Tendon Rupture Score (ATRS) at 3, 6, 9 and 12 months: 100 score equals maximal limitation. The mean ATRS scores a 3, 6, 9 and 12 months were 53 (7–82), 31 (0–74), 30 (0–67) and 15 (1–52) respectively. We have had 4 complications: 2 sural nerve injuries, 1 poor wound healing and 1 re-rupture at 8 weeks. Overall complication rate was 7.1%, comparable to other studies. We have shown a good outcome following percutaneous Achilles tendon repair. The majority of patients show good restoration of function by 3 months and a minor limitation at 6 months. The majority of the improvement in function occurred between 3 and 6 months following surgery. Two patients reported ongoing tendinopathic pain following repair increasing mean scores. We believe this technique can be introduced in District General Hospitals to give good outcome on a cost effective basis

Introduction. Excision of prominent metatarsal heads for severe rheumatoid forefoot deformity is well established in clinical practice but results may deteriorate with time. The Stainsby forefoot arthroplasty however, recognises the pathological anatomy of the deformity and is designed to preserve the metatarsal heads by repositioning the plantar plates and forefoot fat pad underneath them. Design. A prospective case series observing the clinical outcomes and changes in pedobarograph patterns in rheumatoid arthritis patients with severe deformity undergoing Stainsby forefoot arthroplasty. Materials and methods. Twelve patients (21 operated feet) were reviewed at 5 years. AOFAS scores and pedobarographs were recorded pre-operatively and at 5 years post-operatively. Results. AOFAS scores improved significantly from 21 ± 15 pre-operatively to 61 ± 12 at 5 years (p<0.0001) with most of the improvement occurring in the pain score. Pre-operative pedobarographs showed a concentration of forefoot loading, either under the 1st metatarsal or metatarsals 2 and 3, in 38% of patients. Post-operatively there was a significant reduction of peak loading under the 1st metatarsal and metatarsals 2 and 3 and a more even distribution of loading under the forefoot. The duration of the forefoot stance phase as a percentage of total stance phase improved from 24% pre-operatively to 31% post-operatively. Conclusions. Patient reported outcomes indicate the Stainsby procedure provides increased function and lasting pain relief. This is further supported by pedobarograph data showing improvement in the pressure distribution and stance times during gait. We therefore recommend this procedure for management of severe rheumatoid forefoot deformity

Introduction:. Symptomatic treatment of ankle osteoarthritis (OA) with corticosteroid injections is well established. Hyaluronic acid is also reported as an effective symptomatic treatment for ankle OA but these two treatments have not been compared directly. Methods:. A prospective randomised controlled trial in patients with symptomatic ankle osteoarthritis. Twenty patients per group were required based on a significance level of 0.05, and a drop out rate of 5%. Patients were blindly allocated to the treatment or control group. Injections were carried out by the clinician in the outpatient department. Treatment group received Ostenil 20 mg and control group received Depomedrone 40 mg (both as single injections). The treatment arm was allocated by computer generated block randomization to match treatment allocation with grade of arthritis. The primary outcome measure was the change in Visual Analogue Scale (VAS) pain score at 6 months. Secondary outcome was the change in AOFAS score at 6 months. Research ethics committee approval was obtained. Results:. A total of 42 patients were recruited of which 38 completed the study. Male recruits predominated (79%; 33 recruits). More than 70% had radiographic OA of grade 3 or more. Both groups demonstrated statistically significant improvements in VAS at weeks 3, 6, and 3 months over baseline, but the Ostenil group faired better at 6 months follow-up. (difference in VAS scores of 3.5 Ostenil VAS − 4; Steroid VAS − 7.5; Mann Whitney test (p<=0.05). There was no statistical difference in AOFAS scores between both groups at baseline and follow-up (p=0.48, Mann Whitney test). No complications noted. 30% of patients have had their surgical procedures delayed for 6 month post injection. Conclusion:. The Ostenil group revealed similar clinical efficacy to steroid group, however the benefits provided by Ostenil lasted longer. Ostenil provided sufficient mid-term pain-relief whilst patient awaits further definitive intervention

There is no optimal treatment for osteochondral defects of the talus after failed primary surgical treatment. To treat these patients, a 15-mm diameter metal implant was developed for the medial talar dome. The present study was undertaken to evaluate the clinical effectiveness of the metal implantation technique for osteochondral lesions of the medial talar dome. This is a prospective case series. The inclusion criteria were the combination of a large OCD (ϕ >12 mm) of the medial talar dome, persistent complaints >1 year after treatment, and clinically relevant pain levels. The exclusion criteria were: age <18 years, OCD size >20 mm, ankle osteoarthritis grade 2 or 3, concomitant ankle pathology, and diabetes. The primary outcome measure was the Numeric Rating Scale pain (NRS) rest, walking, running, and stair climbing. Secondary outcome measures were: Foot Ankle Outcome Score (FAOS), American Orthopaedic Foot and Ankle Society (AOFAS) Ankle-Hindfoot score, and clinical and radiographic complications. The Wilcoxon signed ranks test was used to calculate p-values. Between October 2007 and March 2009 10 patients were included. The median follow-up was 2 years (range, 2–3 years). On preoperative CT scanning, the median lesion size was 15 (range, 12–20) × 11 (range, 8–14) mm. The NRS rest improved from a median of 3 (0–7) preoperatively to 0.5 (0–2) at final follow-up (p = 0.017), NRS walking from 6.5 (4–8) to 1 (0–4) (p = 0.005), NRS running from 9 (6–10) to 3 (0–10) (p = 0.024), and NRS stair climbing from 6 (4–8) to 1 (0–7) (p = 0.012). The FAOS improved significantly on four of five subscales. The AOFAS improved from a median of 70 (47–75) before surgery to 89 (69–100) at final follow-up (p = 0.008). There were three temporary complications: hyposensibility about the scar in two and a superficial wound infection in one. There were no radiographic complications

A delay in operative intervention for ankle fracture in the presence of blistering at the operative site is generally considered to reduce problems with soft tissue complications including infection. No evidence exists to show an increased rate of complications. Previous work has characterised two types of blisters clear- and blood-filled. It has been suggested that the presence of a blood-filled blister confers a higher risk of wound healing complications compared with a clear-filled blister. We present a series of patients who underwent surgery for ankle fracture, in the presence of blisters at the operative site, without any change to standard management of the fracture. We also present a review of the literature. We prospectively followed six patients who underwent early internal fixation (no delay in surgical intervention) of ankle fracture in the presence of blisters at the operative site. In many cases the surgical incisions were made through the blistered skin. No patients had any additional treatment for their blisters. All patients were treated with the same postoperative protocol. All six patients with both blister types went on to fracture union with no soft tissue complications and no cases of infection. This initial observational study supports the treatment of ankle fractures with early internal fixation in the presence of soft tissue blisters at the operative site. It is possible that the stabilisation of underlying skeleton results in better healing of the skin and other soft tissues which is a concept often employed in the management of open fractures. We plan to carry out further prospective work on a larger number of patients as part of a randomized trial to confirm this finding

Akins original description of his osteotomy did not describe the use of any metal work. Today the osteotomy is most commonly held and fixed with either a staple or screw. We describe the results obtained with a simple suture technique. Methods Data was collected prospectively on 125 patients undergoing an Akin osteotomy. Hallux valgus (HV) and intermetatarsal (IM) angles pre and postoperatively were recorded. Patients were reviewed at 6 week follow up. Cost analysis was also performed comparing different fixation types. 111 of the patients were female and 14 male. The average age at time of surgery was 49 years. 104 cases were in conjunction with hallux valgus correction while 21 cases were for hallux interphalangeus. The mean preoperative HV angle was 33.3 degrees (range 22 to 53), and the IM angle 13.3 degrees (range 9 to 25). At the 6 week follow up all patients had shown signs of radiological union. The postoperative HV angle was 12.4 degrees (range 7 to 17) and the IM angle 6.4 degrees (range 5 to 11). All patients maintained their correction. There were no complications, infections or fixation problems. All patients were satisfied with their surgery and would have it repeated again. The suture technique was the most cost effective method. We describe a quick, easy, implant free method of fixing the Akin osteotomy. There is no need for metalwork removal and in today's world of austerity and the current climate of widespread budget constraints we describe a cost effective method which is clinically just as effective as methods requiring a staple or screw

Aim. Young patients with ankle arthritis that remains symptomatic in spite of conservative treatment and following arthroscopic debridement are usually offered either ankle fusion or ankle replacement. Both these options are far from ideal in this age group. The aim of this study was to evaluate functional outcomes following ankle distraction to determine whether it is a reliable alternative for the treatment of ankle arthritis in young adults. Material and methods. Data was collected prospectively for 15 patients (9 males and 6 females, mean age 31.9 years) with “stage 2” ankle arthritis who failed conservative treatment and continued to be symptomatic following arthroscopic ankle debridement. Distraction of 8 mm was done using a dynamic constrained ankle circular frame and all patients were allowed full weight bearing all through the distraction process. The subjective functional evaluation was based on the American Orthopaedic Foot and Ankle Score (AOFAS), the Foot Disability Index (FADI) and the Visual Analogue Score (VAS). In 10 patients the Manchester Oxford Foot questionnaire (MOXFQ) and the Short Form (SF) 12 patient satisfaction questionnaire were also filled preoperatively and at final follow up. Results. At a minimum follow-up of 24 months (mean 34.4) none of the patients required fusion or replacement. There was a significant improvement in all the functional outcome scores. There was also a significant improvement in the ankle joint space on weight bearing x-rays. Conclusion. Based on these results the use of ankle distraction can be considered a useful option for the treatment of symptomatic “stage 2” ankle arthritis in young adults. Longer-term follow-up and comparison with alternative techniques will be required to evaluate the true effectiveness of this treatment option

Background

Previous studies have individually shown extracorporeal shockwave therapy (ESWT) to be beneficial for mid-substance Achilles tendinopathy, insertional Achilles tendinopathy or plantar fasciitis. The purpose of this pragmatic study was to determine the efficacy of ESWT in managing the three main causes of refractory heel pain in our routine clinical practice.

This study investigated athletes presenting with grade II syndesmosis injuries and identified the clinical and radiological factors important in differentiating a stable from dynamically unstable injury and those findings associated with a longer recovery and return to sport. Sixty-four athletes were prospectively assessed with an average follow-up of 37 months (range 24–66 months). Athletes with an isolated distal syndesmosis (+/− medial deltoid ligament) injury were included. Those athletes with a concomitant ankle fracture were excluded. Those considered stable (grade IIa) were treated conservatively with a boot and progressive rehabilitation. Those with clinical signs of instability underwent arthroscopy and if instability was confirmed (grade IIb) the syndesmosis was stabilized surgically. The clinical assessment of injury to individual ligaments of the ankle and syndesmosis were recorded along with MRI findings, complications and time to return to play. All athletes returned to the same level of professional sport – 28 with IIa injuries returned at a mean of 45 days whereas the 36 with grade IIb injuries returned to play at a mean of 64 days (p< 0.001). Clinical assessment of injury to the ligaments of the syndesmosis correlated well with MRI findings. Those with a positive squeeze test were 9.5 times as likely and those with a deltoid injury 11 times more likely to have an unstable syndesmosis confirmed arthroscopically. The combination of injury to the AITFL and deltoid ligament was associated with a delay in return to sport. Concomitant injury to the ATFL indicated a different mechanism of injury with the syndesmosis less likely to be unstable and was associated with an earlier return to sport. Clinical and MRI findings may differentiate stable from dynamically unstable grade II injuries and identify which athletes may benefit from early arthroscopic assessment and stabilization. It also suggests the timeframe for expected return to play