Kimmo T. Mattila

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Ischial tuberosity pain in athletes may be caused by several clinical entities, which include acute and old bony or periosteal avulsions and apophysitis. We studied the natural course of these injuries based on our clinical case series of fourteen patients with apophysitis and twenty-one with avulsion of the ischial tuberosity. Only patients with the(More)
BACKGROUND 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. OBJECTIVE To evaluate the results of surgical treatment for distal hamstring tears. DESIGN A case series of 18(More)
BACKGROUND Complete proximal hamstring avulsions can cause considerable morbidity and are often associated with significant functional loss. HYPOTHESIS Early surgical treatment leads to better results than does surgery in the chronic phase. STUDY DESIGN Case series; Level of evidence, 4. METHODS Forty-one patients (21 men and 20 women) with a complete(More)
BACKGROUND The optimal treatment for symptomatic, nontraumatic rotator cuff tear is unknown. The purpose of this trial was to compare the effectiveness of physiotherapy, acromioplasty, and rotator cuff repair for this condition. We hypothesized that rotator cuff repair yields superior results compared with other treatment modalities. METHODS One hundred(More)
BACKGROUND Hamstring injuries are common especially in athletes. Partial and complete tears of the proximal origin may cause pain and functional loss. OBJECTIVE To evaluate the results of surgical treatment for partial proximal hamstring tears. METHODS Between 1994 and 2005, 47 athletes (48 cases, 1 bilateral) with partial proximal hamstring tears were(More)
BACKGROUND 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. HYPOTHESIS Surgery (semimembranosus tenotomy and(More)
A prospective randomized long-term follow-up study of bioactive glass (BG)-S53P4 and autogenous bone (AB) used as bone graft substitutes in benign bone tumor surgery during 1993-1997 was conducted. Twenty-one patients (11 in the BG group, 10 in the AB group) participated in a 14-year follow-up. X-rays and MRI scans were obtained, and in the BG group, CT(More)
OBJECTIVE The purpose of this article is to describe weight-bearing CT of the lower extremity joints using a novel portable imager utilizing cone-beam CT technology. CONCLUSION Cone-beam CT technology with new design and flexible gantry movements allows both supine and weight-bearing imaging of the lower extremities, with a reasonable radiation dose and(More)
PURPOSE To analyze the structural changes seen at computed tomography (CT), particularly the findings that precede insufficiency (fatigue) fractures in massive osteoarticular knee allografts. MATERIALS AND METHODS The subchondral and cancellous bone of 12 allografts were retrospectively evaluated with repeat transaxial CT (mean follow-up, 53 months). (More)
In cementless total hip arthroplasty, osteoporosis may jeopardize the achievement of immediate stability and lead to migration of anatomically shaped femoral stems. Poor quality of proximal cancellous bone per se may also affect the rate of osseointegration. In a selected group of female total hip arthroplasty patients (mean age 64 years) with unremarkable(More)