Lasse Lempainen

Lasse Lempainen
Hospital Pihlajalinna, Turku, Finland

Orthopaedic Surgeon, MD, PhD

About

55
Publications
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1,218
Citations

Publications

Publications (55)
Article
Background Changing direction, kicking, reaching, and jumping have been found to be the primary mechanisms of adductor longus injury. No previous studies specifically analyzing severe adductor longus injury mechanisms using video analysis have been published. Purpose To systematically analyze video footage to describe the mechanisms of severe acut...
Article
Full-text available
This review critically examines the issue of thigh tendon reinjury in athletes, drawing on recent advancements and diverse perspectives in sports medicine. The findings underscore the paramount importance of an early and accurate diagnosis, which significantly influences treatment efficacy and rehabilitation outcomes. We explore the intricacies of...
Article
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Background Making a diagnosis of proximal hamstring tendinopathy (PHT) may be challenging, as patients with correlating clinical symptoms may have normal or minimal findings on magnetic resonance imaging (MRI) scans. Purpose/Hypothesis The purpose of this study was to assess the effect of a novel hip flexion (HF) scanning position on the MRI diagn...
Chapter
Hamstring injuries are common in professional and recreational athletes, and they account for one third of all muscle-tendon injuries. However, hamstring injuries occur also in everyday life and slipping is a typical injury mechanism among general people. Patient history, clinical examination, and magnetic resonance imaging are the most important t...
Article
Background More information is needed regarding return to preinjury sport levels and patient-reported outcomes after tibial spine avulsion (TSA) fracture, which is most common in children aged 8 to 12 years. Purpose To analyze return to play/sport (RTP), subjective knee-specific recovery, and quality of life in patients after TSA fracture treated...
Article
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Objective: To describe injury mechanisms and magnetic resonance imaging (MRI) findings in acute rectus femoris (RF) injuries of soccer players using a systematic video analysis. Design: Descriptive case series study of consecutive RF injuries from November 2017 to July 2022. Setting: Two specialized sports medicine hospitals. Participants: P...
Article
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Objective: To describe the injury mechanisms and magnetic resonance imaging (MRI) findings in acute hamstring injuries of male soccer players using a systematic video analysis. Design: Descriptive case series study of consecutive acute hamstring injuries from September 2017 to January 2022. Setting: Two specialized sports medicine hospitals....
Article
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Background and Objective Muscle injuries are one of the main daily problems in sports medicine, football in particular. However, we do not have a reliable means to predict the outcome, i.e. return to play from severe injury. The aim of the present study was to evaluate the capability of the MLG-R classification system to grade hamstring muscle inju...
Article
Full-text available
Hamstring injuries are among the most common muscle injuries. They have been reported in many different sports, such as running, soccer, track and field, rugby, and waterskiing. However, they are also present among the general population. Most hamstring injuries are mild strains, but also moderate and severe injuries occur. Hamstring injuries usual...
Conference Paper
Introduction and Objective: There is no wide understanding about the recovery of tibial spine avulsion fractures, as regards return to sports and overall satisfaction. The purpose was to analyze return to preinjury level of sports, and subjective knee-specific recovery and the quality of life. Materials and Methods: All children and adolescents wit...
Article
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Most of the anterior thigh injuries are contusions or strains, however, some of these injuries can be career ending. Early diagnosis and correct treatment are key to successful outcome. Analyzing injury mechanism and adding both clinical and imaging findings, clinicians can make the right treatment decisions already often in the acute phase of the...
Article
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Background The optimal treatment for complete avulsions of the proximal adductor longus (AL) is still debatable, and different operative and nonoperative treatment options have been suggested. Purpose To report surgical techniques and functional outcomes of a series of athletes who were treated operatively for proximal AL tears. Study Design Case...
Article
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Objectives Hamstring injuries are common and can now be accurately diagnosed. In addition, novel surgical indications have been introduced. However, evidence-based guidelines on the hamstring injuries in management of top-level athletes are missing. Methods The management methods and outcomes of treatment are classically based on relatively small...
Article
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Background Severe rectus femoris central tendon rupture is an uncommon sports-related injury. Most rectus femoris central tendon injuries can be treated by nonoperative means, but some tend to reinjure, resulting in chronic symptoms. Physicians treating athletes with rectus femoris injuries should be aware of this clinical condition and know that s...
Article
Objective: Excision of the posterosuperior corner of the calcaneus (EPCC) is routinely undertaken in athletes after failure of conservative management of insertional Achilles tendinopathy. Some patients can experience sharp calcaneal pain during postoperative rehabilitation, a sign of a calcaneal bone bruise (CBB). Design: Case series, level of...
Chapter
Proximal hamstring injuries are common in athletes. Surgical indications are based on to regain the pre-injury activity level of the athlete. The key to achieve athletes back to play is to understand that hamstrings consist of three different muscles that have different functions. The rupture of proximal hamstring tendon can occur to one, two or al...
Chapter
Tendinopathy is a common clinical problem which affects a substantial portion of recreational and professional athletes and those in many occupations involving repetitive work [1].
Article
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Purpose Proximal tibia impaction fractures are specific injuries, usually caused by trampolining. They may associate with later growth disturbances. There is sparse understanding about their recent epidemiology, in particular the changing incidence. Their typical radiographic findings are not completely known. Methods All children, aged < 16 years...
Chapter
Achilles tendon tendinopathies form a special group of disorders, which usually affect athletes or physically active individuals as overuse injuries from hard training and performances in sports. There are congenital reasons leading to Achilles complaints, and sometimes overuse injuries occur to normal people, too. Tendinopathies can be divided to...
Article
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Background Proximal rectus femoris (PRF) tears are relatively rare injuries among top-level athletes. PRF injuries can be avulsions of both tendon heads (direct and reflected heads) or of a single head, and some have a tendency to progress to recurrent injuries. Purpose To describe a series of operatively treated PRF ruptures in professional socce...
Article
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Background. Several techniques have been introduced to treat acromioclavicular (AC) separation using the semitendinosus tendon as a graft for coracoclavicular (CC) ligament reconstruction. However, the tendon may have been used previously or the patient may not want it harvested. Hence, synthetic tendon transfers have become increasingly popular. M...
Article
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Introduction: Pelvic apophyseal avulsion can limit young athletes' performance for months and may result in permanent disability. Nonoperative treatment is most commonly preferred, while surgical management with reduction and fixation is reserved for selected cases. Our aim was to evaluate outcomes of operative management of pelvic apophyseal avul...
Article
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Several techniques have been introduced to treat acromioclavicular separation with coracoclavicular ligament reconstruction using graft augmentation. A modified arthroscopic technique for coracoclavicular ligament reconstruction was used based on a previous technique where the supportive device and tendon graft share the clavicular and coracoid dri...
Article
Introduction: Rectus femoris muscle injuries are common in sports. Although majority of these injuries are treated conservatively, some tend to present significant disability which could compromise the returning to pre-activity level of competition in athletes. The purpose of this study is to evaluate possible benefits of operative treatment in acu...
Article
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Background As compared with injuries involving muscle only, those involving the central hamstring tendon have a worse prognosis. Limited information is available regarding the surgical treatment of central tendon injuries of the hamstrings. Purpose To describe the operative treatment and outcomes of central tendon injuries of the hamstrings among...
Article
PurposeThe purpose of this study was to report characteristics and outcomes of surgical excision of symptomatic mature posttraumatic myositis ossificans in adult athletes. The hypothesis was that surgical excision of the ossified mass in these circumstances can effectively relief symptoms and result in return to high-level sports with minimal posto...
Chapter
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Article
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Introduction: Total hip arthroplasty (THA) with uncemented implants has been a relatively common procedure in Finland during the recent decades. The most common brand of uncemented implants was chosen for further analysis to study the survivorship of this uncemented cup design in comparison to cemented references. Patients, materials and methods:...
Article
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Background: Semitendinosus (ST) is widely used autograft in anterior cruciate ligament reconstructions (ACLR). Although tendon harvesting is a common procedure, some patients exhibit pain, cramping and dysfunctional at posterior thigh after the ACLR. The formation of the newly regenerated neotendon could be compromised by a new injury or too rapid...
Article
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Background: Stress fractures of sacrum are rare overuse injuries. They are difficult to diagnose, because usually the symptoms are thought to result from other reasons in the pelvic area. Purpose: To report a series of sacral stress fractures in athletes and physically active older individuals. Study design: Case series. Methods: During the years 1...
Article
Full-text available
proximal hamstring tendinopathy (PHT) is a disabilitating disease often causing underperformance in the athletically demanding patients. The main symptom of PHT is lower gluteal pain especially during running or while prolonged sitting. Mainly affecting athletically active individuals, PHT is a considerable challenge for treating health care profes...
Article
Proximal hamstring tears can be associated with chronic disability related to the unusual formation of heterotopic ossifications. The role for operative intervention in these circumstances has not been clearly defined. The purpose of this study was to describe the surgical management of young athletes who had chronic disability related to proximal...
Article
Full-text available
Background: Nonsurgical treatments for chronic Achilles tendinopathy (AT) results in unpredictable success rates. Surgical treatment may be chosen as reports show mostly encouraging but variable success rates depending on the pathology. The distribution of surgically confirmed pathologies in AT is largely unknown. Purpose: To ascertain the distrib...
Article
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Background and Aims Periprosthetic supracondylar fractures after total knee arthroplasty are often associated with poor bone stock, fracture comminution, and loose components. Current operative methods include plating, intramedullary nailing, and re-arthroplasty, depending on the fracture type. The aim of the study was to assess the outcome of oper...
Article
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Hamstring injuries are among the most common muscle injuries seen in sports clinical practice. This narrative review covers essential knowledge of hamstring injuries, ranging from strains to total proximal three-tendon ruptures. The primary aim is to provide basic information for clinicians and sports medicine therapists dealing with hamstring prob...
Article
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Background and aims: Stress fractures are common overuse injuries in athletes. Medial malleolar stress fractures are rare but they have an important clinical relevance because of their tendency to cause considerable disability and loss of time in sports without proper treatment. The diagnosis of medial malleolar stress fracture is often a challeng...
Article
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In active people, insertional calcific tendinopathy (CT) of the Achilles tendon is rare. We evaluated the results of surgical treatment for Achilles tendon CT and analyzed post-surgery Achilles tendon histological features. The study included 36 operations in 34 patients. Twenty-eight (78%) cases had a resection of a Haglund's deformity performed....
Article
Triceps muscle tears requiring surgical treatment are uncommon injuries. We present 10 cases, all of them were athletes. All these patients were treated surgically between 1993 and 2009. Three operations were performed in the acute phase and the rest seven cases an average of 6 months (range 3-12 months) after the primary injury. The mean follow-up...
Article
Hamstring injuries are common, especially in athletes. They are particularly associated with sports that involve running and jumping, as well as rapid acceleration and deceleration. The spectrum of hamstring injuries spans from minor strains to partial tears to complete avulsions of 1, 2, or all 3 tendons. Severe hamstring injuries in which one or...
Article
Proximal hamstring tendinopathy is a remarkable clinical problem that expresses itself by lower gluteal pain, especially during running at a faster pace or sprinting, causing impaired athletic performance. This chronic disorder affects athletes and recreational exercisers of various sports activities, but it has been especially seen in sprinters an...
Article
Full-text available
Tendon disorders are common problems in sports and are known to be difficult to treat. Only limited information is available concerning treatment of proximal hamstring tendinopathy. To the authors' knowledge, no histopathologic findings of proximal hamstring tendinosis have been published. Surgery (semimembranosus tenotomy and exploration of the sc...
Article
Complete proximal hamstring avulsions can cause considerable morbidity and are often associated with significant functional loss. Early surgical treatment leads to better results than does surgery in the chronic phase. Case series; Level of evidence, 4. Forty-one patients (21 men and 20 women) with a complete proximal hamstring avulsion were includ...
Article
Hamstring injuries are common, especially among athletes. A complete rupture of the proximal hamstring muscles requires surgical intervention. In this report we describe a reconstruction method for a complete proximal hamstring rupture using fascia lata autograft augmentation in addition to suture anchors. This method can be advocated in cases in w...
Article
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Hamstring strains are among the most frequent injuries in sports, especially in events requiring sprinting and running. Distal tears of the hamstring muscles requiring surgical treatment are scarcely reported in the literature. To evaluate the results of surgical treatment for distal hamstring tears. A case series of 18 operatively treated distal h...
Article
Full-text available
Hamstring injuries are common especially in athletes. Partial and complete tears of the proximal origin may cause pain and functional loss. To evaluate the results of surgical treatment for partial proximal hamstring tears. Between 1994 and 2005, 47 athletes (48 cases, 1 bilateral) with partial proximal hamstring tears were operated on. The cases w...

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