A combined Maquet and proximal tibial valgus osteotomy has been used to treat patients presenting with anterior and medial compartmental degenerative arthritis. Patients with clinically symptomatic lateral compartmental disease, gross instability, or a nonfunctional range of motion were excluded. Thirty-four knees in 31 patients whose average age was 59.6 years were studied. Follow-up periods range from six to 36 months (mean, 16 months). Results have been tabulated with respect to the patient's preoperative radiographs and clinical knee ratings. The surgical technique has been the same throughout the series and is notable for the absence of metallic fixation and for the division of the tibiofibular joint proximally without an associated fibular osteotomy. Neither nonunion nor peroneal nerve dysfunction was encountered postoperation. To date, 68% of the results have been graded as good to excellent, 20% as fair, and 12% have failed. No correlation was found between preoperative radiographic rating and postoperative result.