Prior Calf Strain as a Risk Factor for Achilles Tendon Rupture in National Basketball Association Players: A...

Area of Science:

• Sports Medicine
• Orthopedics
• Biomechanics

Background:

• Achilles tendon ruptures are severe injuries in professional basketball, causing long absences and performance decrements.
• The link between calf strains and subsequent Achilles tendon ruptures in NBA athletes is not well understood.

Purpose of the Study:

• To investigate if a prior calf strain is associated with an increased risk of Achilles tendon rupture in NBA players.
• To evaluate the long-term performance impact on NBA players following an Achilles tendon rupture.

Main Methods:

• A case-cohort study analyzed publicly available NBA player data from 1958-2024.
• Compared players with Achilles ruptures (n=60) to those with calf strains but no rupture (n=258).
• Utilized logistic regression and paired t-tests to assess risk and performance changes, with video analysis for injury mechanisms.

Main Results:

• Previous calf strain was linked to 2.49 times higher odds of Achilles rupture (P=.02).
• 85.7% of ruptures occurred on the same side as a prior calf strain, with a mean 1.9-year interval.
• Significant post-rupture performance declines were observed in player efficiency rating, win shares, games played, and minutes per game (all P<.001).

Conclusions:

• A prior calf strain is a clinically identifiable risk marker for Achilles tendon rupture in NBA players.
• Achilles ruptures result in substantial, sustained performance declines, even for players who return to play.
• Targeted rehabilitation and movement retraining are recommended for high-risk athletes to prevent rupture progression.