Boone and Azen measured active ROM with a standard goniometer across eight joint regions in 109 healthy males (age 18 months–54 years). The study established age-stratified normative values and compared them against AAOS handbook estimates, which were often exceeded by actual measurements. This is the foundational reference for clinical goniometric norms in orthopedics.
Before this paper, clinicians relied on AAOS handbook values derived from unreferenced sources with no described population or measurement methodology. Boone and Azen replaced expert-opinion estimates with goniometric data from 109 subjects across the full age spectrum.
When assessing a child's ROM, use age-appropriate norms. A 10-year-old's shoulder external rotation of 108° is normal, not hypermobile. An adult at 99° is also normal — neither matches the single AAOS reference of 90°.
When one limb is affected, the contralateral side is a valid internal reference for comparison. When bilateral deficit is suspected, these normative tables provide the benchmark. But apply the same measurement technique used to generate them.
For serial ROM tracking (post-op, rehabilitation), use one tester consistently. The instrument contributes 3.7° of error on its own; adding inter-tester variability makes small changes uninterpretable.
Boone and Azen measured active ROM with a standard goniometer across eight joint regions in 109 healthy males (age 18 months–54 years). The study established age-stratified normative values and compared them against AAOS handbook estimates, which were often exceeded by actual measurements. This is the foundational reference for clinical goniometric norms in orthopedics.
Before this paper, clinicians relied on AAOS handbook values derived from unreferenced sources with no described population or measurement methodology. Boone and Azen replaced expert-opinion estimates with goniometric data from 109 subjects across the full age spectrum.
When assessing a child's ROM, use age-appropriate norms. A 10-year-old's shoulder external rotation of 108° is normal, not hypermobile. An adult at 99° is also normal — neither matches the single AAOS reference of 90°.
When one limb is affected, the contralateral side is a valid internal reference for comparison. When bilateral deficit is suspected, these normative tables provide the benchmark. But apply the same measurement technique used to generate them.
For serial ROM tracking (post-op, rehabilitation), use one tester consistently. The instrument contributes 3.7° of error on its own; adding inter-tester variability makes small changes uninterpretable.