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Skip Main Content Allentown, PA's Trusted Orthopaedic Specialists Delivering Superior Orthopedic Care Since 1970 OAA is the oldest, private orthopedic practice in the Lehigh Valley area dating back to 1970. OAA made a prominent change in the treatments of orthopedics in the region through innovative procedures by former President and Founder Dr. Peter Keblish, and thus a reputation for cutting edge excellence began. Dr.